EIGRP: Troubleshooting East and West unreachability issue

*Mar  1 16:27:08.231: IP: tableid=0, s=172.30.10.3 (local), d=10.2.3.1 (Serial0/0.1), routed via FIB
*Mar  1 16:27:08.231: IP: s=172.30.10.3 (local), d=10.2.3.1 (Serial0/0.1), len 100, sending

*Mar  1 16:27:09.077: IP: s=10.3.2.1 (local), d=224.0.0.10 (Loopback2), len 60, sending broad/multicast
*Mar  1 16:27:09.077: IP: s=10.3.2.1 (Loopback2), d=224.0.0.10, len 60, rcvd 2.
*Mar  1 16:27:09.521: IP: s=10.3.3.1 (local), d=224.0.0.10 (Loopback3), len 60, sending broad/multicast
*Mar  1 16:27:09.521: IP: s=10.3.3.1 (Loopback3), d=224.0.0.10, len 60, rcvd 2
*Mar  1 16:27:10.234: IP: tableid=0, s=172.30.10.3 (local), d=10.2.3.1 (Serial0/0.1), routed via FIB
*Mar  1 16:27:10.234: IP: s=172.30.10.3 (local), d=10.2.3.1 (Serial0/0.1), len 100, sending.

*Mar  1 16:27:11.124: IP: s=10.3.4.1 (local), d=224.0.0.10 (Loopback4), len 60, sending broad/multicast
*Mar  1 16:27:11.124: IP: s=10.3.4.1 (Loopback4), d=224.0.0.10, len 60, rcvd 2
*Mar  1 16:27:11.561: IP: s=10.3.1.1 (local), d=224.0.0.10 (Loopback1), len 60, sending broad/multicast
*Mar  1 16:27:11.561: IP: s=10.3.1.1 (Loopback1), d=224.0.0.10, len 60, rcvd 2
*Mar  1 16:27:12.238: IP: tableid=0, s=172.30.10.3 (local), d=10.2.3.1 (Serial0/0.1), routed via FIB
*Mar  1 16:27:12.238: IP: s=172.30.10.3 (local), d=10.2.3.1 (Serial0/0.1), len 100, sending.

*Mar  1 16:27:13.772: IP: s=10.3.2.1 (local), d=224.0.0.10 (Loopback2), len 60, sending broad/multicast
*Mar  1 16:27:13.772: IP: s=10.3.2.1 (Loopback2), d=224.0.0.10, len 60, rcvd 2
*Mar  1 16:27:13.876: IP: s=10.3.3.1 (local), d=224.0.0.10 (Loopback3), len 60, sending broad/multicast
*Mar  1 16:27:13.876: IP: s=10.3.3.1 (Loopback3), d=224.0.0.10, len 60, rcvd 2
*Mar  1 16:27:14.237: IP: tableid=0, s=172.30.10.3 (local), d=10.2.3.1 (Serial0/0.1), routed via FIB
*Mar  1 16:27:14.237: IP: s=172.30.10.3 (local), d=10.2.3.1 (Serial0/0.1), len 100, sending..

Success rate is 0 percent (0/5)

ICMP echo from West to East failed…. But the CEF is forwarding….did not say route failure or something… what happen?

West#ping 10.2.1.1

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.2.1.1, timeout is 2 seconds:

*Mar  1 16:29:57.461: ICMP: redirect rcvd from 172.30.10.1- for 10.2.1.1 use gw 172.30.10.2…..
Success rate is 0 percent (0/5)

West#ping 10.2.1.1 repeat 1000

Type escape sequence to abort.
Sending 1000, 100-byte ICMP Echos to 10.2.1.1, timeout is 2 seconds:

Tserver#4
[Resuming connection 4 to 2651-4 … ]

*M
East#
*Mar  1 03:18:28.077: ICMP: echo reply sent, src 10.2.1.1, dst 172.30.10.3
East#
*Mar  1 03:18:30.080: ICMP: echo reply sent, src 10.2.1.1, dst 172.30.10.3
East#
*Mar  1 03:18:32.080: ICMP: echo reply sent, src 10.2.1.1, dst 172.30.10.3
East#
*Mar  1 03:18:34.083: ICMP: echo reply sent, src 10.2.1.1, dst 172.30.10.3
East#
*Mar  1 03:18:36.086: ICMP: echo reply sent, src 10.2.1.1, dst 172.30.10.3
East#
*Mar  1 03:18:38.089: ICMP: echo reply sent, src 10.2.1.1, dst 172.30.10.3
East#
*Mar  1 03:18:40.089: ICMP: echo reply sent, src 10.2.1.1, dst 172.30.10.3
East#
*Mar  1 03:18

This is really strange… East has already sent out the icmp reply back to West…. Why is it 100% failure?

03:20:26.211: IP: s=172.30.10.3 (Serial0/0.1), d=10.2.1.1, len 100, rcvd 4
*Mar  1 03:20:26.211:     ICMP type=8, code=0
*Mar  1 03:20:26.211: IP: tableid=0, s=10.2.1.1 (local), d=172.30.10.3 (Serial0/0.1), routed via RIB
*Mar  1 03:20:26.211: IP: s=10.2.1.1 (local), d=172.30.10.3 (Serial0/0.1), len 100, sending
*Mar  1 03:20:26.211:     ICMP type=0, code=0
*Mar  1 03:20:26.211: IP: s=10.2.1.1 (local), d=172.30.10.3 (Serial0/0.1), len 100, encapsulation failed
*Mar  1 03:20:26.211:     ICMP type=0, code=0
East#
*Mar  1 03:20:27.669: IP: s=10.2.2.1 (local), d=224.0.0.10 (Loopback2), len 60, sending broad/multicast, proto=88
*Mar  1 03:20:27.669: IP: s=10.2.2.1 (Loopback2), d=224.0.0.10, len 60, rcvd 2, proto=88
*Mar  1 03:20:27.745: IP: s=10.2.5.1 (local), d=224.0.0.10 (Loopback5), len 60, sending broad/multicast, proto=88
*Mar  1 03:20:27.745: IP: s=10.2.5.1 (Loopback5), d=224.0.0.10, len 60, rcvd 2, proto=88
*Mar  1 03:20:28.150: IP: s=10.2.1.1 (local), d=224.0.0.10 (Loopback1), len 60, sending broad/multicast, proto=88
*Mar  1 03:20:28.150: IP: s=10.2.1.1 (Loopback1), d=224.0.0.10, len 60, rcvd 2, proto=88
*Mar  1 03:20:28.214: IP: tableid=0, s=172.30.10.3 (Serial0/0.1), d=10.2.1.1 (Loopback1), routed via RIB
*Mar  1 03:20:28.214: IP: s=172.30.10.3 (Serial0/0.1), d=10.2.1.1, len 100, rcvd 4
*Mar  1 03:20:28.214:     ICMP type=8, code=0
*Mar  1 03:20:28.214: IP: tableid=0, s=10.2.1.1 (local), d=172.30.10.3 (Serial0/0.1), routed via RIB
*Mar  1 03:20:28.214: IP: s=10.2.1.1 (local
East#), d=172.30.10.3 (Serial0/0.1), len 100, sending
*Mar  1 03:20:28.214:     ICMP type=0, code=0
*Mar  1 03:20:28.214: IP: s=10.2.1.1 (local), d=172.30.10.3 (Serial0/0.1), len 100, encapsulation failed
*Mar  1 03:20:28.214:     ICMP type=0, code=0

*Mar  1 03:20:28.963: IP: s=10.2.4.1 (local), d=224.0.0.10 (Loopback4), len 60, sending broad/multicast, proto=88
*Mar  1 03:20:28.963: IP: s=10.2.4.1 (Loopback4), d=224.0.0.10, len 60, rcvd 2, proto=88
*Mar  1 03:20:29.464: IP: s=10.2.3.1 (local), d=224.0.0.10 (Loopback3), len 60, sending broad/multicast, proto=88
*Mar  1 03:20:29.464: IP: s=10.2.3.1 (Loopback3), d=224.0.0.10, len 60, rcvd 2, proto=88
East#
*Mar  1 03:20:30.213: IP: tableid=0, s=172.30.10.3 (Serial0/0.1), d=10.2.1.1 (Loopback1), routed via RIB
*Mar  1 03:20:30.213: IP: s=172.30.10.3 (Serial0/0.1), d=10.2.1.1, len 100, rcvd 4
*Mar  1 03:20:30.213:     ICMP type=8, code=0
*Mar  1 03:20:30.213: IP: tableid=0, s=10.2.1.1 (local), d=172.30.10.3 (Serial0/0.1), routed via RIB
*Mar  1 03:20:30.213: IP: s=10.2.1.1 (local), d=172.30.10.3 (Serial0/0.1), len 100, sending
*Mar  1 03:20:30.217:     ICMP type=0, code=0
*Mar  1 03:20:30.217: IP: s=10.2.1.1 (local), d=172.30.10.3 (Serial0/0.1), len 100, encapsulation failed
*Mar  1 03:20:30.217:     ICMP type=0, code=0
East#
*Mar  1 03:20:32.056: IP: s=10.2.2.1 (local), d=224.0.0.10 (Loopback2), len 60, sending broad/multicast, proto=88
*Mar  1 03:20:32.056: IP: s=10.2.2.1 (Loopback2), d=224.0.0.10, len 60, rcvd 2, proto=88
*Mar  1 03:20:32.188: IP: s=10.2.5.1 (local), d=224.0.0.10 (Loopback5), len 60, sending broad/multicast, proto=88
*Mar  1 03:20:32.188: IP: s=10.2.5.1 (Loopback5), d=224.0.0.10, len 60, rcvd 2, proto=88
*Mar  1 03:20:32.212: IP: tableid=0, s=172.30.10.3 (Serial0/0.1), d=10.2.1.1 (Loopback1), routed via RIB

East#
*Mar  1 03:45:51.239: CEF-IDB: process queued interface events
*Mar  1 03:45:51.239: CEF-IDB: Serial0/0 coming up failed: interface not up
*Mar  1 03:45:51.239: CEF-IDB: Serial0/1 coming up failed: interface not up
*Mar  1 03:45:51.239: CEF-IDB: restart queued interface events
East#
*Mar  1 03:46:06.239: CEF-IDB: process queued interface events
*Mar  1 03:46:06.239: CEF-IDB: Serial0/0 coming up failed: interface not up
*Mar  1 03:46:06.239: CEF-IDB: Serial0/1 coming up failed: interface not up
*Mar  1 03:46:06.239: CEF-IDB: restart queued interface events
East#
*Mar  1 03:46:21.240: CEF-IDB: process queued interface events
*Mar  1 03:46:21.240: CEF-IDB: Serial0/0 coming up failed: interface not up
*Mar  1 03:46:21.240: CEF-IDB: Serial0/1 coming up failed: interface not up
*Mar  1 03:46:21.240: CEF-IDB: restart queued interface events
East#

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