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LO:10.10.10.102

LO:10.10.10.101. 192.168.1.1/24. 161.142.1.0/30. LO:10.10.10.103. .2. .1. LO:172.16.1.1/32. CEA-1. PE1. Primary. LO:172.16.3.1/32. .9. .10. HSRP. P1. PE3. CEA-3. VIP: 192.168.1.4. CE-HQ. Backup. 161.142.1.8/30. .6. .5. 192.168.1.3/24. CEA-2. PE2. 161.142.1.4/30.

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LO:10.10.10.102

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  1. LO:10.10.10.101 192.168.1.1/24 161.142.1.0/30 LO:10.10.10.103 .2 .1 LO:172.16.1.1/32 CEA-1 PE1 Primary LO:172.16.3.1/32 .9 .10 HSRP P1 PE3 CEA-3 VIP: 192.168.1.4 CE-HQ Backup 161.142.1.8/30 .6 .5 192.168.1.3/24 CEA-2 PE2 161.142.1.4/30 192.168.1.2/24 LO:10.10.10.102 X CEA-2>sh standbyFastEthernet2/0 - Group 0   State is Active    5 state changes, last state change 00:02:07   Virtual IP address is 192.168.1.4  Active virtual MAC address is 0000.0c07.ac00    Local virtual MAC address is 0000.0c07.ac00 (v1 default)  Hello time 3 sec, hold time 10 sec     Next hello sent in 1.460 secs   Preemption enabled, delay min 10 secs  Active router is local   Standby router is unknown   Priority 100 (default 100)    Track interface Serial0/0 state Up decrement 10   IP redundancy name is "hsrp-Fa2/0-0" (default) CEA-1#conf tEnter configuration commands, one per line.  End with CNTL/Z.CEA-1(config)#int fa2/0CEA-1(config-if)#shut*Mar  1 13:45:53.388: %HSRP-6-STATECHANGE: FastEthernet2/0 Grp 0 state Active -> Init *Mar  1 13:45:55.384: %LINK-5-CHANGED: Interface FastEthernet2/0, changed state to administratively down*Mar  1 13:45:56.384: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet2/0, changed state to down

  2. LO:10.10.10.101 192.168.1.1/24 161.142.1.0/30 LO:10.10.10.103 .2 .1 LO:172.16.1.1/32 CEA-1 PE1 Primary LO:172.16.3.1/32 .9 .10 HSRP P1 PE3 CEA-3 VIP: 192.168.1.4 CE-HQ Backup 161.142.1.8/30 .6 .5 192.168.1.3/24 CEA-2 PE2 161.142.1.4/30 192.168.1.2/24 LO:10.10.10.102 X EHQ#ping 172.16.3.1 source 172.16.1.1 Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 172.16.3.1, timeout is 2 seconds: Packet sent with a source address of 172.16.1.1.....Success rate is 0 percent (0/5) CEHQ#sh ip int briefinterface                  IP-Address      OK? Method Status                Protocol FastEthernet0/0            192.168.1.3     YES manual up                    up      Loopback0                  172.16.1.1      YES manual up                    up      CEA-1#sh standby FastEthernet2/0 - Group 0   State is Active     5 state changes, last state change 12:18:31   Virtual IP address is 192.168.1.4  Active virtual MAC address is 0000.0c07.ac00    Local virtual MAC address is 0000.0c07.ac00 (v1 default)  Hello time 3 sec, hold time 10 sec     Next hello sent in 1.016 secs   Preemption enabled, delay min 10 secs  Active router is local   Standby router is 192.168.1.2, priority 100 (expires in 8.696 sec)   Priority 100 (default 100)    Track interface Serial0/0 state Up decrement 10  IP redundancy name is "hsrp-Fa2/0-0" (default) CEHQ#tr 172.16.3.1 source 172.16.1.1 numeric Type escape sequence to abort.Tracing the route to 172.16.3.1   1 192.168.1.2 16 msec 20 msec 16 msec   2 161.142.1.5 12 msec 36 msec 40 msec  3  *  *  *   4  *  *  *   5  *  *  *

  3. LO:10.10.10.101 192.168.1.1/24 X LO:10.10.10.103 .2 .1 LO:172.16.1.1/32 CEA-1 PE1 161.142.1.0/30 Primary LO:172.16.3.1/32 .9 .10 HSRP P1 PE3 CEA-3 VIP: 192.168.1.4 CE-HQ Backup 161.142.1.8/30 .6 .5 192.168.1.3/24 CEA-2 PE2 161.142.1.4/30 192.168.1.2/24 LO:10.10.10.102 CEA-3#sh ip int briefInterface                  IP-Address      OK? Method Status                ProtocolSerial0/0                  161.142.1.10    YES NVRAM  up                    up      Loopback0                  172.16.3.1      YES manual up                    up      CEA-3#ping 172.16.1.1 source 172.16.3.1 Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 172.16.1.1, timeout is 2 seconds:Packet sent with a source address of 172.16.3.1 U.U.USuccess rate is 0 percent (0/5) CEA-3#tr 172.16.1.1 source 172.16.3.1 numeric Type escape sequence to abort.Tracing the route to 172.16.1.1   1 161.142.1.9 16 msec 4 msec 8 msec  2 10.10.10.9 12 msec 56 msec 28 msec  3 161.142.1.1 76 msec 64 msec 36 msec   4 161.142.1.2 88 msec 36 msec 68 msec  5 161.142.1.2 !H  *  !H Output: Even though the link of CEA-1 down, the PE1 is up, traffic got black holed at CEA-1

  4. LO:10.10.10.101 192.168.1.1/24 X LO:10.10.10.103 .2 .1 LO:172.16.1.1/32 CEA-1 PE1 161.142.1.0/30 Primary LO:172.16.3.1/32 .9 .10 HSRP P1 PE3 CEA-3 VIP: 192.168.1.4 CE-HQ Backup 161.142.1.8/30 .6 .5 192.168.1.3/24 CEA-2 PE2 161.142.1.4/30 192.168.1.2/24 LO:10.10.10.102 PE1-AS1>sh ip bgp vpn vrf CustomerA 172.16.1.1 BGP routing table entry for 1:100:172.16.1.1/32, version 29Paths: (2 available, best #1, table CustomerA)  Advertised to update-groups:     1           Local161.142.1.2 from 0.0.0.0 (10.10.10.101)      Origin incomplete, metric 0, localpref 100, weight 32768, valid, sourced, best       Extended Community: RT:1:100,      mpls labels in/out 21/nolabel  Local10.10.10.102 (metric 129) from 10.10.10.102 ( 10.10.10.102)      Origin incomplete, metric 0, localpref 100, valid, internal      Extended Community: RT:1:100,      mpls labels in/out 21/22 PE3-AS1#sh ip bgp vpn vrf CustomerA 172.16.1.1 BGP routing table entry for 1:100:172.16.1.1/32, version 28Paths: (2 available, best #1, table CustomerA)   Not advertised to any peer  Local10.10.10.101 (metric 129) from 10.10.10.101 (10.10.10.101)      Origin incomplete, metric 0, localpref 100, valid, internal, best      Extended Community: RT:1:100,       mpls labels in/out nolabel/21  Local10.10.10.102 (metric 129) from 10.10.10.102 (10.10.10.102)      Origin incomplete, metric 0, localpref 100, valid, internal      Extended Community: RT:1:100,       mpls labels in/out nolabel/22 From PE perspective, it seems that, the traffic still prefer via CEA-1 <-> PE1

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