IP ROUTE CS - BGP

8/7/2019 IP ROUTE CS - BGP

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IP ROUTE Case Study - BGP

Instructor: Krzysztof KaczorAuthor: Piotr Mossakowski

Szczecin, www.uczelnia.it
http://www.uczelnia.it/http://www.uczelnia.it/http://www.uczelnia.it/


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Contents:1) Topology ........................... ........................... ........................... ........................... ........................... ....................... 3

2) Configuration R1 ........................ ........................... ........................... ........................... ........................... .............. 3

3) Configuration R2 ........................ ........................... ........................... ........................... ........................... ............ 15

4) Configuration R3 ........................ ........................... ........................... ........................... ........................... ............ 24

5) Configuration R4 ........................ ........................... ........................... ........................... ........................... ............ 35


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1) Topology

Figure 1 - Topology BGP Case Study

2) Configuration R1

R1#sh ip routeCodes: C - connected, S - static, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter areaN1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2E1 - OSPF external type 1, E2 - OSPF external type 2i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area* - candidate default, U - per-user static route, o - ODRP - periodic downloaded static route


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Gateway of last resort is not set

192.168.14.0/30 is subnetted, 1 subnetsC 192.168.14.0 is directly connected, FastEthernet1/0

172.16.0.0/20 is subnetted, 1 subnetsB 172.16.0.0 [20/0] via 192.168.14.2, 00:01:38

10.0.0.0/8 is variably subnetted, 7 subnets, 3 masksD 10.3.3.0/24 [90/20640000] via 10.1.103.3, 00:31:32, Serial0/1D 10.2.2.0/24 [90/20640000] via 10.1.102.2, 00:31:32, Serial0/0C 10.1.1.0/24 is directly connected, Loopback1D 10.20.0.0/22 [90/20640000] via 10.1.102.2, 00:31:32, Serial0/0C 10.1.103.0/29 is directly connected, Serial0/1C 10.1.102.0/29 is directly connected, Serial0/0D 10.1.203.0/29 [90/21024000] via 10.1.102.2, 00:31:32, Serial0/0

[90/21024000] via 10.1.103.3, 00:31:32, Serial0/1192.168.34.0/30 is subnetted, 1 subnets

D 192.168.34.0 [90/21024000] via 10.1.103.3, 00:31:32, Serial0/1

R1#show ip interface brief Interface IP-Address OK? Method Status ProtocolSerial0/0 10.1.102.1 YES NVRAM up upSerial0/1 10.1.103.1 YES NVRAM up upSerial0/2 unassigned YES NVRAM administratively down downSerial0/3 unassigned YES NVRAM administratively down downFastEthernet1/0 192.168.14.1 YES NVRAM up upVirtual-Access1 unassigned YES unset up upLoopback1 10.1.1.1 YES NVRAM up up

R1#show ip protocols

Routing Protocol is "eigrp 65001"Outgoing update filter list for all interfaces is not setIncoming update filter list for all interfaces is not setDefault networks flagged in outgoing updatesDefault networks accepted from incoming updatesEIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0EIGRP maximum hopcount 100EIGRP maximum metric variance 1Redistributing: eigrp 65001EIGRP NSF-aware route hold timer is 240sAutomatic network summarization is not in effect

Maximum path: 4Routing for Networks:

10.1.1.0/2410.1.102.0/2910.1.103.0/29192.16.14.0/30192.168.14.0/30

Passive Interface(s):FastEthernet1/0


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Loopback1Routing Information Sources:Gateway Distance Last UpdateGateway Distance Last Update10.1.103.3 90 00:02:3510.1.102.2 90 00:02:36

Distance: internal 90 external 170

Routing Protocol is "bgp 65001"Outgoing update filter list for all interfaces is not setIncoming update filter list for all interfaces is not setIGP synchronization is disabledAutomatic route summarization is disabledNeighbor(s):Address FiltIn FiltOut DistIn DistOut Weight RouteMap10.2.2.210.3.3.3192.168.14.2 out4allnetworks

Maximum path: 1Routing Information Sources:Gateway Distance Last Update10.2.2.2 200 00:01:4510.3.3.3 200 00:01:51192.168.14.2 20 00:01:57

Distance: external 20 internal 200 local 200

R1#sh ip bgp neighborsBGP neighbor is 10.2.2.2, remote AS 65001, internal linkBGP version 4, remote router ID 10.20.3.1

BGP state = Established, up for 00:03:14Last read 00:00:14, hold time is 180, keepalive interval is 60 secondsNeighbor capabilities:Route refresh: advertised and received(old & new)Address family IPv4 Unicast: advertised and received

Message statistics:InQ depth is 0OutQ depth is 0

Sent RcvdOpens: 2 2Notifications: 0 0

Updates: 4 4Keepalives: 37 37Route Refresh: 0 0Total: 43 43

Default minimum time between advertisement runs is 5 seconds

For address family: IPv4 UnicastBGP table version 9, neighbor version 9Index 1, Offset 0, Mask 0x2


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Sent RcvdPrefix activity: ---- ----Prefixes Current: 2 2 (Consumes 96 bytes)Prefixes Total: 2 2Implicit Withdraw: 0 0Explicit Withdraw: 0 0Used as bestpath: n/a 2Used as multipath: n/a 0

Outbound InboundLocal Policy Denied Prefixes: -------- -------Bestpath from this peer: 2 n/aBestpath from iBGP peer: 1 n/aTotal: 3 0

Number of NLRIs in the update sent: max 1, min 0

Connections established 2; dropped 1Last reset 00:03:41, due to User reset

Connection state is ESTAB, I/O status: 1, unread input bytes: 0Local host: 10.1.1.1, Local port: 11002Foreign host: 10.2.2.2, Foreign port: 179

Enqueued packets for retransmit: 0, input: 0 mis-ordered: 0 (0 bytes)

Event Timers (current time is 0x1E75B0):Timer Starts Wakeups NextRetrans 9 0 0x0TimeWait 0 0 0x0AckHold 6 4 0x0

SendWnd 0 0 0x0KeepAlive 0 0 0x0GiveUp 0 0 0x0PmtuAger 0 0 0x0DeadWait 0 0 0x0

iss: 448428985 snduna: 448429259 sndnxt: 448429259 sndwnd: 16111irs: 3640627385 rcvnxt: 3640627655 rcvwnd: 16115 delrcvwnd: 269

SRTT: 210 ms, RTTO: 904 ms, RTV: 694 ms, KRTT: 0 msminRTT: 16 ms, maxRTT: 300 ms, ACK hold: 200 ms

Flags: higher precedence, nagle, md5

Datagrams (max data segment is 516 bytes):Rcvd: 10 (out of order: 0), with data: 6, total data bytes: 269Sent: 14 (retransmit: 0, fastretransmit: 0), with data: 8, total data bytes: 273

BGP neighbor is 10.3.3.3, remote AS 65001, internal linkBGP version 4, remote router ID 10.3.3.3BGP state = Established, up for 00:03:14


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Last read 00:00:13, hold time is 180, keepalive interval is 60 secondsNeighbor capabilities:Route refresh: advertised and received(old & new)Address family IPv4 Unicast: advertised and received


Sent RcvdOpens: 3 3Notifications: 0 0Updates: 6 5Keepalives: 40 40Route Refresh: 0 0Total: 49 48


For address family: IPv4 UnicastBGP table version 9, neighbor version 9

Index 2, Offset 0, Mask 0x4Sent RcvdPrefix activity: ---- ----Prefixes Current: 2 1 (Consumes 48 bytes)Prefixes Total: 2 2Implicit Withdraw: 0 0Explicit Withdraw: 0 1Used as bestpath: n/a 1Used as multipath: n/a 0

Outbound Inbound

Local Policy Denied Prefixes: -------- -------Bestpath from this peer: 1 n/aBestpath from iBGP peer: 2 n/aTotal: 3 0





Event Timers (current time is 0x1E788C):Timer Starts Wakeups NextRetrans 9 0 0x0TimeWait 0 0 0x0AckHold 7 1 0x0SendWnd 0 0 0x0


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KeepAlive 0 0 0x0GiveUp 0 0 0x0PmtuAger 0 0 0x0DeadWait 0 0 0x0


SRTT: 210 ms, RTTO: 904 ms, RTV: 694 ms, KRTT: 0 msminRTT: 28 ms, maxRTT: 300 ms, ACK hold: 200 msFlags: higher precedence, nagle, md5


BGP neighbor is 192.168.14.2, remote AS 65002, external linkBGP version 4, remote router ID 172.16.12.1






For address family: IPv4 UnicastBGP table version 9, neighbor version 9Index 3, Offset 0, Mask 0x8Inbound path policy configuredOutbound path policy configured

Route map for incoming advertisements is out4allnetworksRoute map for outgoing advertisements is med_65002

Sent RcvdPrefix activity: ---- ----Prefixes Current: 4 1 (Consumes 48 bytes)Prefixes Total: 4 1Implicit Withdraw: 0 0Explicit Withdraw: 0 0Used as bestpath: n/a 1


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Used as multipath: n/a 0

Outbound InboundLocal Policy Denied Prefixes: -------- -------

AS_PATH loop: n/a 3Bestpath from this peer: 1 n/aTotal: 1 3





Event Timers (current time is 0x1E7B40):

Timer Starts Wakeups NextRetrans 9 0 0x0TimeWait 0 0 0x0AckHold 7 4 0x0SendWnd 0 0 0x0KeepAlive 0 0 0x0GiveUp 0 0 0x0PmtuAger 0 0 0x0DeadWait 0 0 0x0

iss: 3563897439 snduna: 3563897759 sndnxt: 3563897759 sndwnd: 16065

irs: 794788675 rcvnxt: 794788977 rcvwnd: 16083 delrcvwnd: 301



R1# sh ip bgp summary

BGP router identifier 10.1.1.1, local AS number 65001BGP table version is 9, main routing table version 95 network entries using 505 bytes of memory5 path entries using 240 bytes of memory5 BGP path attribute entries using 300 bytes of memory1 BGP AS-PATH entries using 24 bytes of memory0 BGP route-map cache entries using 0 bytes of memory0 BGP filter-list cache entries using 0 bytes of memoryBGP using 1069 total bytes of memory


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BGP activity 11/6 prefixes, 12/7 paths, scan interval 60 secs

Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd10.2.2.2 4 65001 44 44 9 0 0 00:04:19 210.3.3.3 4 65001 49 50 9 0 0 00:04:17 1192.168.14.2 4 65002 44 48 9 0 0 00:04:09 1

R1#sh ip bgpBGP table version is 12, local router ID is 10.1.1.1Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

r RIB-failure, S StaleOrigin codes: i - IGP, e - EGP, ? - incomplete

Network Next Hop Metric LocPrf Weight Path*> 10.1.1.0/24 0.0.0.0 0 32768 ir>i10.2.2.0/24 10.2.2.2 0 100 0 ir>i10.3.3.0/24 10.3.3.3 0 100 0 ir>i10.20.0.0/22 10.2.2.2 128256 100 0 i

*> 172.16.0.0/20 192.168.14.2 0 200 0 65002 i

R1#sh runBuilding configuration...

Current configuration : 2348 bytes!version 12.2service timestamps debug datetime msecservice timestamps log datetime msecno service password-encryption

!hostname R1!logging queue-limit 100!username mossapio privilege 15 secret 5 $1$F70d$7jswMoThmMPYvVEFC/BQy1ip subnet-zero!!no ip domain lookupip domain name cisco.com

!!!!!!!!!


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!!!!no voice hpi capture bufferno voice hpi capture destination!!mta receive maximum-recipients 0!!!!interface Loopback1ip address 10.1.1.1 255.255.255.0!interface Serial0/0description R1->R2

bandwidth 128ip address 10.1.102.1 255.255.255.248serial restart_delay 0clockrate 128000!interface Serial0/1description R1->R3bandwidth 128ip address 10.1.103.1 255.255.255.248serial restart_delay 0clockrate 128000

!interface Serial0/2no ip addressshutdownserial restart_delay 0!interface Serial0/3no ip addressshutdownserial restart_delay 0!

interface FastEthernet1/0description R1->R4ip address 192.168.14.1 255.255.255.252duplex autospeed auto!router eigrp 65001passive-interface FastEthernet1/0passive-interface Loopback1


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network 10.1.1.0 0.0.0.255network 10.1.102.0 0.0.0.7network 10.1.103.0 0.0.0.7network 192.16.14.0 0.0.0.3network 192.168.14.0 0.0.0.3no auto-summary!router bgp 65001no synchronizationbgp log-neighbor-changesnetwork 10.1.1.0 mask 255.255.255.0neighbor 10.2.2.2 remote-as 65001neighbor 10.2.2.2 update-source Loopback1neighbor 10.2.2.2 password cisconeighbor 10.3.3.3 remote-as 65001neighbor 10.3.3.3 update-source Loopback1neighbor 10.3.3.3 password cisconeighbor 192.168.14.2 remote-as 65002

neighbor 192.168.14.2 route-map out4allnetworks inneighbor 192.168.14.2 route-map med_65002 outneighbor 192.168.14.2 password ciscono auto-summary!no ip http serverip http secure-serverip classless!!!

access-list 10 permit 172.16.0.0 0.0.15.255!route-map med_65002 permit 10set metric 0!route-map out4allnetworks permit 10match ip address 10set local-preference 200!route-map out4allnetworks permit 20!

call rsvp-sync!!mgcp profile default!!!dial-peer cor custom!


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!!!!line con 0exec-timeout 0 0logging synchronousline aux 0line vty 0 4exec-timeout 15 0loginlength 0transport input sshline vty 5 15exec-timeout 15 0loginlength 0transport input ssh

!!end

R1#tclshR1(tcl)#foreach address {

+>(tcl)#10.2.2.2+>(tcl)#10.20.1.1+>(tcl)#10.20.2.1+>(tcl)#10.20.3.1

+>(tcl)#10.3.3.3+>(tcl)#172.16.0.1+>(tcl)#172.16.4.1+>(tcl)#172.16.8.1+>(tcl)#172.16.12.1+>(tcl)#+>(tcl)#} { ping $address source 10.1.1.1 }

Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 10.2.2.2, timeout is 2 seconds:Packet sent with a source address of 10.1.1.1

!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 8/17/24 msType escape sequence to abort.Sending 5, 100-byte ICMP Echos to 10.20.1.1, timeout is 2 seconds:Packet sent with a source address of 10.1.1.1!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 8/24/40 msType escape sequence to abort.Sending 5, 100-byte ICMP Echos to 10.20.2.1, timeout is 2 seconds:


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Packet sent with a source address of 10.1.1.1!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 4/15/28 msType escape sequence to abort.Sending 5, 100-byte ICMP Echos to 10.20.3.1, timeout is 2 seconds:Packet sent with a source address of 10.1.1.1!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 4/17/36 msType escape sequence to abort.Sending 5, 100-byte ICMP Echos to 10.3.3.3, timeout is 2 seconds:Packet sent with a source address of 10.1.1.1!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 8/15/32 msType escape sequence to abort.Sending 5, 100-byte ICMP Echos to 172.16.0.1, timeout is 2 seconds:Packet sent with a source address of 10.1.1.1!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 8/24/48 ms

Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 172.16.4.1, timeout is 2 seconds:Packet sent with a source address of 10.1.1.1!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 16/32/48 msType escape sequence to abort.Sending 5, 100-byte ICMP Echos to 172.16.8.1, timeout is 2 seconds:Packet sent with a source address of 10.1.1.1!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 4/27/44 msType escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 172.16.12.1, timeout is 2 seconds:Packet sent with a source address of 10.1.1.1!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 8/29/60 ms

R1#tracerouteProtocol [ip]:Target IP address: 172.16.4.1Source address: 10.1.1.1

Tracing the route to 172.16.4.1

1 192.168.14.2 36 msec

R1(config)#int fastEthernet 1/0R1(config-if)#shutR1(config-if)#*Mar 1 00:39:44.927: %BGP-5-ADJCHANGE: neighbor 192.168.14.2 Down Interface flap*Mar 1 00:39:46.911: %LINK-5-CHANGED: Interface FastEthernet1/0, changed state to administratively down*Mar 1 00:39:47.911: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet1/0, changed state to down


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R4#*Mar 1 00:42:11.223: %BGP-5-ADJCHANGE: neighbor 192.168.14.1 Down BGP Notification sentR4#*Mar 1 00:42:11.223: %BGP-3-NOTIFICATION: sent to neighbor 192.168.14.1 4/0 (hold time expired) 0 bytes

R1#tracerouteProtocol [ip]:Target IP address: 172.16.12.1Source address: 10.1.1.1Tracing the route to 172.16.12.1

1 10.1.103.3 36 msec2 192.168.34.2 68 msec

3) Configuration R2R2#show ip interface brief Interface IP-Address OK? Method Status ProtocolSerial0/0 10.1.102.2 YES NVRAM up upSerial0/1 10.1.203.2 YES NVRAM up upSerial0/2 unassigned YES NVRAM administratively down downSerial0/3 unassigned YES NVRAM administratively down downVirtual-Access1 unassigned YES unset up upLoopback2 10.2.2.2 YES NVRAM up upLoopback200 10.20.0.1 YES NVRAM up upLoopback201 10.20.1.1 YES NVRAM up upLoopback202 10.20.2.1 YES NVRAM up upLoopback203 10.20.3.1 YES NVRAM up up

R2#show ip routeCodes: C - connected, S - static, R - RIP, M - mobile, B - BGP



192.168.14.0/30 is subnetted, 1 subnetsD 192.168.14.0 [90/20514560] via 10.1.102.1, 00:06:02, Serial0/0

172.16.0.0/20 is subnetted, 1 subnetsB 172.16.0.0 [200/0] via 192.168.14.2, 00:05:19

10.0.0.0/8 is variably subnetted, 11 subnets, 3 masksD 10.3.3.0/24 [90/20640000] via 10.1.203.3, 00:06:02, Serial0/1C 10.2.2.0/24 is directly connected, Loopback2D 10.1.1.0/24 [90/20640000] via 10.1.102.1, 00:06:02, Serial0/0


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C 10.20.2.0/24 is directly connected, Loopback202C 10.20.3.0/24 is directly connected, Loopback203C 10.20.0.0/24 is directly connected, Loopback200D 10.20.0.0/22 is a summary, 00:06:03, Null0C 10.20.1.0/24 is directly connected, Loopback201D 10.1.103.0/29 [90/21024000] via 10.1.203.3, 00:06:03, Serial0/1

[90/21024000] via 10.1.102.1, 00:06:03, Serial0/0C 10.1.102.0/29 is directly connected, Serial0/0C 10.1.203.0/29 is directly connected, Serial0/1

192.168.34.0/30 is subnetted, 1 subnetsD 192.168.34.0 [90/21024000] via 10.1.203.3, 00:06:03, Serial0/1

R2#show ip protocolsRouting Protocol is "eigrp 65001"Outgoing update filter list for all interfaces is not setIncoming update filter list for all interfaces is not setDefault networks flagged in outgoing updatesDefault networks accepted from incoming updates

EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0EIGRP maximum hopcount 100EIGRP maximum metric variance 1Redistributing: eigrp 65001EIGRP NSF-aware route hold timer is 240sAutomatic network summarization is not in effectAddress Summarization:10.20.0.0/22 for Serial0/0, Serial0/1Summarizing with metric 128256

Maximum path: 4Routing for Networks:

10.1.102.0/2910.1.203.0/2910.2.2.0/2410.20.0.0/22

Passive Interface(s):Loopback2Loopback200

Passive Interface(s):Loopback201Loopback202Loopback203

Routing Information Sources:Gateway Distance Last Update(this router) 90 00:06:2910.1.102.1 90 00:06:2810.1.203.3 90 00:06:28


Routing Protocol is "bgp 65001"Outgoing update filter list for all interfaces is not set


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Incoming update filter list for all interfaces is not setIGP synchronization is disabledAutomatic route summarization is disabledNeighbor(s):Address FiltIn FiltOut DistIn DistOut Weight RouteMap10.1.1.110.3.3.3

Maximum path: 1Routing Information Sources:Gateway Distance Last Update10.3.3.3 200 00:05:44Gateway Distance Last Update10.1.1.1 200 00:05:41


R2#sh ip bgp neighborsBGP neighbor is 10.1.1.1, remote AS 65001, internal linkBGP version 4, remote router ID 10.1.1.1







Sent RcvdPrefix activity: ---- ----

Prefixes Current: 2 2 (Consumes 96 bytes)Prefixes Total: 2 3Implicit Withdraw: 0 0Explicit Withdraw: 0 1Used as bestpath: n/a 2Used as multipath: n/a 0



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Bestpath from this peer: 3 n/aBestpath from iBGP peer: 3 n/aTotal: 6 0


Connections established 2; dropped 1Last reset 00:19:06, due to Peer closed the session



Event Timers (current time is 0x2C93CC):Timer Starts Wakeups NextRetrans 22 0 0x0TimeWait 0 0 0x0AckHold 25 18 0x0

SendWnd 0 0 0x0KeepAlive 0 0 0x0GiveUp 0 0 0x0PmtuAger 0 0 0x0DeadWait 0 0 0x0


SRTT: 284 ms, RTTO: 413 ms, RTV: 129 ms, KRTT: 0 msminRTT: 16 ms, maxRTT: 300 ms, ACK hold: 200 ms

Flags: passive open, nagle, gen tcbs, md5


BGP neighbor is 10.3.3.3, remote AS 65001, internal linkBGP version 4, remote router ID 10.3.3.3BGP state = Established, up for 00:26:34Last read 00:00:34, hold time is 180, keepalive interval is 60 secondsNeighbor capabilities:

Route refresh: advertised and received(old & new)Address family IPv4 Unicast: advertised and received


Sent RcvdOpens: 2 2Notifications: 0 0Updates: 4 6


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Keepalives: 53 53Route Refresh: 0 0Total: 59 61




Outbound Inbound

Local Policy Denied Prefixes: -------- -------Bestpath from this peer: 3 n/aBestpath from iBGP peer: 5 n/aTotal: 8 0





Event Timers (current time is 0x2C96C4):Timer Starts Wakeups NextRetrans 30 0 0x0TimeWait 0 0 0x0AckHold 35 29 0x0SendWnd 0 0 0x0KeepAlive 0 0 0x0GiveUp 0 0 0x0

PmtuAger 0 0 0x0DeadWait 0 0 0x0


SRTT: 294 ms, RTTO: 339 ms, RTV: 45 ms, KRTT: 0 msminRTT: 4 ms, maxRTT: 300 ms, ACK hold: 200 msFlags: passive open, nagle, gen tcbs, md5


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R2#show ip bgpBGP table version is 9, local router ID is 10.20.3.1Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,


Network Next Hop Metric LocPrf Weight Pathr>i10.1.1.0/24 10.1.1.1 0 100 0 i*> 10.2.2.0/24 0.0.0.0 0 32768 ir>i10.3.3.0/24 10.3.3.3 0 100 0 i*> 10.20.0.0/22 0.0.0.0 128256 32768 i*>i172.16.0.0/20 192.168.14.2 0 200 0 65002 i


Current configuration : 2298 bytes!version 12.2service timestamps debug datetime msecservice timestamps log datetime msecno service password-encryption!hostname R2

!logging queue-limit 100!username mossapio privilege 15 secret 5 $1$RbHI$dLlsl1ZAgpELJqu8SwGi80ip subnet-zero!!no ip domain lookupip domain name cisco.com!!

!!!!!!!!!


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!!no voice hpi capture bufferno voice hpi capture destination!!mta receive maximum-recipients 0!!!!interface Loopback2ip address 10.2.2.2 255.255.255.0!interface Loopback200ip address 10.20.0.1 255.255.255.0!interface Loopback201

ip address 10.20.1.1 255.255.255.0!interface Loopback202ip address 10.20.2.1 255.255.255.0!interface Loopback203ip address 10.20.3.1 255.255.255.0!interface Serial0/0description R2->R1bandwidth 128

ip address 10.1.102.2 255.255.255.248ip summary-address eigrp 65001 10.20.0.0 255.255.252.0 5serial restart_delay 0clockrate 128000!interface Serial0/1description R2->R3bandwidth 128ip address 10.1.203.2 255.255.255.248ip summary-address eigrp 65001 10.20.0.0 255.255.252.0 5serial restart_delay 0

clockrate 128000!interface Serial0/2no ip addressshutdownserial restart_delay 0!interface Serial0/3no ip address


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shutdownserial restart_delay 0!router eigrp 65001passive-interface Loopback2passive-interface Loopback200passive-interface Loopback201passive-interface Loopback202passive-interface Loopback203network 10.1.102.0 0.0.0.7network 10.1.203.0 0.0.0.7network 10.2.2.0 0.0.0.255network 10.20.0.0 0.0.3.255no auto-summary!router bgp 65001no synchronizationbgp log-neighbor-changes

network 10.2.2.0 mask 255.255.255.0network 10.20.0.0 mask 255.255.252.0neighbor 10.1.1.1 remote-as 65001neighbor 10.1.1.1 update-source Loopback2neighbor 10.1.1.1 password cisconeighbor 10.3.3.3 remote-as 65001neighbor 10.3.3.3 update-source Loopback2neighbor 10.3.3.3 password ciscono auto-summary!no ip http server

ip http secure-serverip classless!!!!call rsvp-sync!!mgcp profile default!

!!dial-peer cor custom!!!!!line con 0


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Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 172.16.8.1, timeout is 2 seconds:Packet sent with a source address of 10.20.0.1!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 20/51/92 msType escape sequence to abort.Sending 5, 100-byte ICMP Echos to 172.16.12.1, timeout is 2 seconds:Packet sent with a source address of 10.20.0.1!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 20/80/116 ms


1 10.1.102.1 20 msec

2 192.168.14.2 60 msec

R1(config)#int fastEthernet 1/0R1(config-if)#shut*Mar 1 00:51:38.307: %BGP-5-ADJCHANGE: neighbor 192.168.14.2 Down Interface flap*Mar 1 00:51:40.291: %LINK-5-CHANGED: Interface FastEthernet1/0, changed state to administratively down*Mar 1 00:51:41.291: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet1/0, changed state to downR4#*Mar 1 00:54:09.227: %BGP-5-ADJCHANGE: neighbor 192.168.14.1 Down BGP Notification sentR4#*Mar 1 00:54:09.227: %BGP-3-NOTIFICATION: sent to neighbor 192.168.14.1 4/0 (hold time expired) 0 bytes


1 10.1.203.3 44 msec2 192.168.34.2 56 msec

4) Configuration R3R3#show ip interface brief Interface IP-Address OK? Method Status ProtocolSerial0/0 10.1.103.3 YES NVRAM up upSerial0/1 10.1.203.3 YES NVRAM up upSerial0/2 192.168.34.1 YES NVRAM up upSerial0/3 unassigned YES NVRAM administratively down downVirtual-Access1 unassigned YES unset up upLoopback3 10.3.3.3 YES NVRAM up up


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Gateway Distance Last Update10.1.103.1 90 00:08:5110.1.203.2 90 00:08:51


Routing Protocol is "bgp 65001"Outgoing update filter list for all interfaces is not setIncoming update filter list for all interfaces is not setIGP synchronization is disabledAutomatic route summarization is disabledNeighbor(s):Address FiltIn FiltOut DistIn DistOut Weight RouteMap10.1.1.110.2.2.2192.168.34.2

Maximum path: 1Routing Information Sources:Gateway Distance Last Update

10.2.2.2 200 00:08:0310.1.1.1 200 00:08:02192.168.34.2 20 00:08:13


R3#sh ip bgp neiBGP neighbor is 10.1.1.1, remote AS 65001, internal linkBGP version 4, remote router ID 10.1.1.1BGP state = Established, up for 00:28:17Last read 00:00:17, hold time is 180, keepalive interval is 60 secondsNeighbor capabilities:

Route refresh: advertised and received(old & new)Address family IPv4 Unicast: advertised and received


Sent RcvdOpens: 3 3Notifications: 0 0Updates: 9 10Keepalives: 65 65Route Refresh: 0 0

Total: 77 78Default minimum time between advertisement runs is 5 seconds


Sent RcvdPrefix activity: ---- ----Prefixes Current: 1 2 (Consumes 96 bytes)


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Prefixes Total: 4 4Implicit Withdraw: 0 0Explicit Withdraw: 3 2Used as bestpath: n/a 2Used as multipath: n/a 0

Outbound InboundLocal Policy Denied Prefixes: -------- -------Bestpath from this peer: 4 n/aBestpath from iBGP peer: 2 n/aTotal: 6 0





Event Timers (current time is 0x356804):Timer Starts Wakeups NextRetrans 37 0 0x0TimeWait 0 0 0x0AckHold 37 6 0x0SendWnd 0 0 0x0KeepAlive 0 0 0x0GiveUp 0 0 0x0

PmtuAger 0 0 0x0DeadWait 0 0 0x0



Datagrams (max data segment is 516 bytes):

Rcvd: 68 (out of order: 0), with data: 37, total data bytes: 920Sent: 44 (retransmit: 0, fastretransmit: 0), with data: 36, total data bytes: 947

BGP neighbor is 10.2.2.2, remote AS 65001, internal linkBGP version 4, remote router ID 10.20.3.1BGP state = Established, up for 00:36:13Last read 00:00:13, hold time is 180, keepalive interval is 60 secondsNeighbor capabilities:Route refresh: advertised and received(old & new)


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Address family IPv4 Unicast: advertised and receivedMessage statistics:InQ depth is 0OutQ depth is 0

Sent RcvdOpens: 2 2Notifications: 0 0Updates: 8 4Keepalives: 63 63Route Refresh: 0 0Total: 73 69



Sent RcvdPrefix activity: ---- ----

Prefixes Current: 1 2 (Consumes 96 bytes)Prefixes Total: 4 2Implicit Withdraw: 0 0Explicit Withdraw: 3 0Used as bestpath: n/a 2Used as multipath: n/a 0

Outbound InboundLocal Policy Denied Prefixes: -------- -------Bestpath from this peer: 2 n/aBestpath from iBGP peer: 6 n/a

Total: 8 0Number of NLRIs in the update sent: max 1, min 0




Event Timers (current time is 0x356BF8):Timer Starts Wakeups NextRetrans 49 1 0x0TimeWait 0 0 0x0AckHold 39 4 0x0SendWnd 0 0 0x0KeepAlive 0 0 0x0GiveUp 0 0 0x0PmtuAger 0 0 0x0


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DeadWait 0 0 0x0




BGP neighbor is 192.168.34.2, remote AS 65002, external linkBGP version 4, remote router ID 172.16.12.1BGP state = Established, up for 00:36:01Last read 00:00:00, hold time is 180, keepalive interval is 60 secondsNeighbor capabilities:

Route refresh: advertised and received(old & new)Address family IPv4 Unicast: advertised and receivedMessage statistics:InQ depth is 0OutQ depth is 0



For address family: IPv4 UnicastBGP table version 18, neighbor version 18Index 3, Offset 0, Mask 0x8Outbound path policy configuredRoute map for outgoing advertisements is med_65002

Sent RcvdPrefix activity: ---- ----Prefixes Current: 5 1 (Consumes 48 bytes)

Prefixes Total: 9 1Implicit Withdraw: 0 0Explicit Withdraw: 4 0Used as bestpath: n/a 0Used as multipath: n/a 0


AS_PATH loop: n/a 16


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Bestpath from this peer: 3 n/aTotal: 3 16





Event Timers (current time is 0x357278):Timer Starts Wakeups NextRetrans 48 0 0x0TimeWait 0 0 0x0AckHold 48 16 0x0SendWnd 0 0 0x0

KeepAlive 0 0 0x0GiveUp 0 0 0x0PmtuAger 0 0 0x0DeadWait 0 0 0x0




R3#sh ip bgp summaryBGP router identifier 10.3.3.3, local AS number 65001BGP table version is 18, main routing table version 185 network entries using 505 bytes of memory6 path entries using 288 bytes of memory5 BGP path attribute entries using 300 bytes of memory1 BGP AS-PATH entries using 24 bytes of memory

0 BGP route-map cache entries using 0 bytes of memory0 BGP filter-list cache entries using 0 bytes of memoryBGP using 1117 total bytes of memoryBGP activity 11/6 prefixes, 16/10 paths, scan interval 60 secs

Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd10.1.1.1 4 65001 84 83 18 0 0 00:34:48 210.2.2.2 4 65001 75 79 18 0 0 00:42:43 2192.168.34.2 4 65002 86 86 18 0 0 00:42:28 1


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Network Next Hop Metric LocPrf Weight Pathr>i10.1.1.0/24 10.1.1.1 0 100 0 ir>i10.2.2.0/24 10.2.2.2 0 100 0 i*> 10.3.3.0/24 0.0.0.0 0 32768 ir>i10.20.0.0/22 10.2.2.2 128256 100 0 i*>i172.16.0.0/20 192.168.14.2 0 200 0 65002 i* 192.168.34.2 0 0 65002 i


Current configuration : 2051 bytes!version 12.2service timestamps debug datetime msecservice timestamps log datetime msecno service password-encryption!hostname R3!logging queue-limit 100!

username mossapio privilege 15 secret 5 $1$tFU4$Np.tmbJmvdPYOJA6gDmL40ip subnet-zero!!no ip domain lookupip domain name cisco.com!!!!!

!!!!!!!!no voice hpi capture buffer


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no voice hpi capture destination!!mta receive maximum-recipients 0!!!!interface Loopback3ip address 10.3.3.3 255.255.255.0!interface Serial0/0description R3->R1bandwidth 128ip address 10.1.103.3 255.255.255.248serial restart_delay 0clockrate 128000!

interface Serial0/1description R3->R2bandwidth 128ip address 10.1.203.3 255.255.255.248serial restart_delay 0clockrate 128000!interface Serial0/2description R3->R4bandwidth 128ip address 192.168.34.1 255.255.255.252

serial restart_delay 0clockrate 128000!interface Serial0/3no ip addressshutdownserial restart_delay 0!router eigrp 65001passive-interface Serial0/2passive-interface Loopback3

network 10.1.103.0 0.0.0.7network 10.1.203.0 0.0.0.7network 10.3.3.0 0.0.0.255network 192.168.34.0 0.0.0.3no auto-summary!router bgp 65001no synchronizationbgp log-neighbor-changes


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network 10.3.3.0 mask 255.255.255.0neighbor 10.1.1.1 remote-as 65001neighbor 10.1.1.1 update-source Loopback3neighbor 10.1.1.1 password cisconeighbor 10.2.2.2 remote-as 65001neighbor 10.2.2.2 update-source Loopback3neighbor 10.2.2.2 password cisconeighbor 192.168.34.2 remote-as 65002neighbor 192.168.34.2 route-map med_65002 outneighbor 192.168.34.2 password ciscono auto-summary!no ip http serverip http secure-serverip classless!!!

!route-map med_65002 permit 10set metric 100!call rsvp-sync!!mgcp profile default!!!

dial-peer cor custom!!!!!line con 0exec-timeout 0 0logging synchronousline aux 0line vty 0 4

exec-timeout 15 0loginlength 0transport input sshline vty 5 15exec-timeout 15 0loginlength 0transport input ssh


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Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 172.16.4.1, timeout is 2 seconds:Packet sent with a source address of 10.3.3.3!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 12/35/72 msType escape sequence to abort.Sending 5, 100-byte ICMP Echos to 172.16.8.1, timeout is 2 seconds:Packet sent with a source address of 10.3.3.3!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 28/48/88 msType escape sequence to abort.Sending 5, 100-byte ICMP Echos to 172.16.12.1, timeout is 2 seconds:Packet sent with a source address of 10.3.3.3!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 16/30/40 ms

R3#tracerouteProtocol [ip]:

Target IP address: 172.16.8.1Source address: 10.3.3.3Tracing the route to 172.16.8.1

1 10.1.103.1 48 msec2 192.168.14.2 76 msec

5) Configuration R4R4#sh ip int brInterface IP-Address OK? Method Status ProtocolSerial0/0 192.168.34.2 YES NVRAM up upSerial0/1 unassigned YES NVRAM administratively down downSerial0/2 unassigned YES NVRAM administratively down downSerial0/3 unassigned YES NVRAM administratively down downFastEthernet1/0 192.168.14.2 YES NVRAM up upVirtual-Access1 unassigned YES unset up upLoopback0 172.16.0.1 YES NVRAM up upLoopback4 172.16.4.1 YES NVRAM up upLoopback8 172.16.8.1 YES NVRAM up upLoopback12 172.16.12.1 YES NVRAM up up

R4#sh ip routeCodes: C - connected, S - static, R - RIP, M - mobile, B - BGP



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192.168.14.0/30 is subnetted, 1 subnetsC 192.168.14.0 is directly connected, FastEthernet1/0

172.16.0.0/16 is variably subnetted, 5 subnets, 2 masksC 172.16.12.0/22 is directly connected, Loopback12C 172.16.8.0/22 is directly connected, Loopback8C 172.16.4.0/22 is directly connected, Loopback4C 172.16.0.0/22 is directly connected, Loopback0S 172.16.0.0/20 is directly connected, Null0

10.0.0.0/8 is variably subnetted, 4 subnets, 2 masksB 10.3.3.0/24 [20/0] via 192.168.14.1, 00:04:00B 10.2.2.0/24 [20/0] via 192.168.14.1, 00:04:00B 10.1.1.0/24 [20/0] via 192.168.14.1, 00:04:00B 10.20.0.0/22 [20/0] via 192.168.14.1, 00:04:00

192.168.34.0/30 is subnetted, 1 subnetsC 192.168.34.0 is directly connected, Serial0/0

R4#show ip protocolsRouting Protocol is "eigrp 65002"Outgoing update filter list for all interfaces is not setIncoming update filter list for all interfaces is not setDefault networks flagged in outgoing updatesDefault networks accepted from incoming updatesEIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0EIGRP maximum hopcount 100EIGRP maximum metric variance 1Redistributing: eigrp 65002EIGRP NSF-aware route hold timer is 240s

Automatic network summarization is not in effectMaximum path: 4Routing for Networks:

172.16.0.0/20192.168.14.0/30192.168.34.0/30

Passive Interface(s):Serial0/0FastEthernet1/0Loopback0Loopback4

Loopback8Loopback12

Routing Information Sources:Gateway Distance Last Update


Routing Protocol is "bgp 65002"Outgoing update filter list for all interfaces is not setIncoming update filter list for all interfaces is not set


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IGP synchronization is disabledAutomatic route summarization is disabledNeighbor(s):Address FiltIn FiltOut DistIn DistOut Weight RouteMap192.168.14.1192.168.34.1

Maximum path: 1Routing Information Sources:Gateway Distance Last Update192.168.34.1 20 00:10:04192.168.14.1 20 00:09:55


R4#sh ip bgp neiBGP neighbor is 192.168.14.1, remote AS 65001, external linkBGP version 4, remote router ID 10.1.1.1BGP state = Established, up for 00:04:25Last read 00:00:25, hold time is 180, keepalive interval is 60 seconds

Neighbor capabilities:Route refresh: advertised and received(old & new)Address family IPv4 Unicast: advertised and received


Sent RcvdOpens: 4 4Notifications: 2 0Updates: 10 18Keepalives: 64 58

Route Refresh: 0 0Total: 80 80



Sent RcvdPrefix activity: ---- ----Prefixes Current: 1 4 (Consumes 192 bytes)Prefixes Total: 5 4

Implicit Withdraw: 0 0Explicit Withdraw: 4 0Used as bestpath: n/a 4Used as multipath: n/a 0


AS_PATH loop: n/a 1Bestpath from this peer: 4 n/a


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Total: 4 1Number of NLRIs in the update sent: max 4, min 0

Connections established 4; dropped 3Last reset 00:07:14, due to BGP Notification sent, hold time expired



Event Timers (current time is 0x383790):Timer Starts Wakeups NextRetrans 9 0 0x0TimeWait 0 0 0x0AckHold 9 6 0x0SendWnd 0 0 0x0KeepAlive 0 0 0x0

GiveUp 0 0 0x0PmtuAger 0 0 0x0DeadWait 0 0 0x0




BGP neighbor is 192.168.34.1, remote AS 65001, external linkBGP version 4, remote router ID 10.3.3.3BGP state = Established, up for 00:39:02Last read 00:00:02, hold time is 180, keepalive interval is 60 secondsNeighbor capabilities:Route refresh: advertised and received(old & new)Address family IPv4 Unicast: advertised and received




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AS_PATH loop: n/a 4

Bestpath from this peer: 12 n/aTotal: 12 4Number of NLRIs in the update sent: max 4, min 0




Event Timers (current time is 0x383988):Timer Starts Wakeups NextRetrans 52 0 0x0TimeWait 0 0 0x0AckHold 50 40 0x0SendWnd 0 0 0x0KeepAlive 0 0 0x0GiveUp 0 0 0x0PmtuAger 0 0 0x0DeadWait 0 0 0x0



Datagrams (max data segment is 1440 bytes):


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Rcvd: 68 (out of order: 0), with data: 50, total data bytes: 1356Sent: 92 (retransmit: 0, fastretransmit: 0), with data: 51, total data bytes: 1420

R4# sh ip bgp summaryBGP router identifier 172.16.12.1, local AS number 65002BGP table version is 35, main routing table version 355 network entries using 505 bytes of memory9 path entries using 432 bytes of memory3 BGP path attribute entries using 180 bytes of memory1 BGP AS-PATH entries using 24 bytes of memory0 BGP route-map cache entries using 0 bytes of memory0 BGP filter-list cache entries using 0 bytes of memoryBGP using 1141 total bytes of memoryBGP activity 6/1 prefixes, 27/18 paths, scan interval 60 secs

Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd192.168.14.1 4 65001 81 81 35 0 0 00:05:14 4192.168.34.1 4 65001 83 83 35 0 0 00:39:50 4



Network Next Hop Metric LocPrf Weight Path*> 10.1.1.0/24 192.168.14.1 0 0 65001 i* 192.168.34.1 100 0 65001 i*> 10.2.2.0/24 192.168.14.1 0 0 65001 i

* 192.168.34.1 100 0 65001 i*> 10.3.3.0/24 192.168.14.1 0 0 65001 i* 192.168.34.1 100 0 65001 i*> 10.20.0.0/22 192.168.14.1 0 0 65001 i* 192.168.34.1 100 0 65001 i*> 172.16.0.0/20 0.0.0.0 0 32768 i


Current configuration : 2112 bytes

!version 12.2service timestamps debug datetime msecservice timestamps log datetime msecno service password-encryption!hostname R4!logging queue-limit 100


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!username mossapio privilege 15 secret 5 $1$iQif$CL3jCsyS5JFtcp8rTRlva/ip subnet-zero!!no ip domain lookupip domain name cisco.com!!!!!!!!!!!

!!no voice hpi capture bufferno voice hpi capture destination!!mta receive maximum-recipients 0!!!!

interface Loopback0ip address 172.16.0.1 255.255.252.0!interface Loopback4ip address 172.16.4.1 255.255.252.0!interface Loopback8ip address 172.16.8.1 255.255.252.0!interface Loopback12ip address 172.16.12.1 255.255.252.0

!interface Serial0/0description R4->R3bandwidth 128ip address 192.168.34.2 255.255.255.252serial restart_delay 0clockrate 128000!interface Serial0/1


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no ip addressshutdownserial restart_delay 0!interface Serial0/2no ip addressshutdownserial restart_delay 0!interface Serial0/3no ip addressshutdownserial restart_delay 0!interface FastEthernet1/0description R4->R1ip address 192.168.14.2 255.255.255.252duplex auto

speed auto!router eigrp 65002passive-interface Serial0/0passive-interface FastEthernet1/0passive-interface Loopback0passive-interface Loopback4passive-interface Loopback8passive-interface Loopback12network 172.16.0.0 0.0.15.255network 192.168.14.0 0.0.0.3

network 192.168.34.0 0.0.0.3no auto-summary!router bgp 65002no synchronizationbgp log-neighbor-changesnetwork 172.16.0.0 mask 255.255.240.0neighbor 192.168.14.1 remote-as 65001neighbor 192.168.14.1 password cisconeighbor 192.168.34.1 remote-as 65001neighbor 192.168.34.1 password cisco

no auto-summary!no ip http serverip http secure-serverip classlessip route 172.16.0.0 255.255.240.0 Null0!!!


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!call rsvp-sync!!mgcp profile default!!!dial-peer cor custom!!!!!line con 0exec-timeout 0 0logging synchronousline aux 0

line vty 0 4exec-timeout 15 0loginlength 0transport input sshline vty 5 15exec-timeout 15 0loginlength 0transport input ssh!

!end

R4# tclshR4(tcl)#foreach address {

+>(tcl)#10.2.2.2+>(tcl)#10.20.1.1+>(tcl)#10.20.2.1+>(tcl)#10.20.3.1+>(tcl)#10.3.3.3

+>(tcl)#10.1.1.1+>(tcl)#+>(tcl)#} { ping $address source 172.16.12.1 }

Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 10.2.2.2, timeout is 2 seconds:Packet sent with a source address of 172.16.12.1!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 24/60/104 ms


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Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 10.20.1.1, timeout is 2 seconds:Packet sent with a source address of 172.16.12.1!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 12/38/88 msType escape sequence to abort.Sending 5, 100-byte ICMP Echos to 10.20.2.1, timeout is 2 seconds:Packet sent with a source address of 172.16.12.1!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 36/52/64 msType escape sequence to abort.Sending 5, 100-byte ICMP Echos to 10.20.3.1, timeout is 2 seconds:Packet sent with a source address of 172.16.12.1!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 24/58/76 msType escape sequence to abort.Sending 5, 100-byte ICMP Echos to 10.3.3.3, timeout is 2 seconds:Packet sent with a source address of 172.16.12.1

!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 8/36/64 msType escape sequence to abort.Sending 5, 100-byte ICMP Echos to 10.1.1.1, timeout is 2 seconds:Packet sent with a source address of 172.16.12.1!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 4/18/32 ms

R4#tracerouteProtocol [ip]:Target IP address: 10.20.2.1

Source address: 172.16.0.1Tracing the route to 10.20.2.1

1 192.168.14.1 32 msec2 10.1.102.2 64 msec


1 192.168.14.1 12 msec2 10.1.103.3 88 msec

IP ROUTE CS - BGP

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