06-11-2009 03:20 AM
Hi all,
We have c2600 router connected by tunnel to main vpn site.
sh log shows
Jun 10 20:27:30 extende: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 22: Neighbor 10.32.29.175 (Tunnel120) is down: Interface Goodbye received
Jun 10 20:27:34 extende: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 22: Neighbor 10.32.29.175 (Tunnel120) is up: new adjacency
Jun 11 00:59:20 extende: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 22: Neighbor 10.32.29.175 (Tunnel120) is down: Interface Goodbye received
Jun 11 00:59:23 extende: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 22: Neighbor 10.32.29.175 (Tunnel120) is up: new adjacency
Jun 11 02:01:56 extende: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 22: Neighbor 10.32.29.175 (Tunnel120) is down: Interface Goodbye received
Jun 11 02:01:59 extende: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 22: Neighbor 10.32.29.175 (Tunnel120) is up: new adjacency
Jun 11 02:07:39 extende: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 22: Neighbor 10.32.29.175 (Tunnel120) is down: Interface Goodbye received
Jun 11 02:07:4
Tunnel120 is up, line protocol is up
Hardware is Tunnel
Description: === IPSEC TUNNEL
Interface is unnumbered. Using address of FastEthernet0/1 (10.251.32.10)
MTU 1514 bytes, BW 1000 Kbit, DLY 500000 usec,
reliability 255/255, txload 5/255, rxload 21/255
Encapsulation TUNNEL, loopback not set
Keepalive not set
Tunnel source 207.229.32.120 (FastEthernet0/0), destination 208.98.244.51
Tunnel protocol/transport GRE/IP
Key disabled, sequencing disabled
Checksumming of packets disabled
Tunnel TTL 255
Fast tunneling enabled
Tunnel transmit bandwidth 8000 (kbps)
Tunnel receive bandwidth 8000 (kbps)
Last input 00:00:00, output 00:00:01, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 1
Queueing strategy: fifo
Output queue: 0/0 (size/max)
5 minute input rate 84000 bits/sec, 22 packets/sec
5 minute output rate 23000 bits/sec, 18 packets/sec
9476461 packets input, 204834848 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
9723521 packets output, 499331584 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
sh ip eigrp nei
IP-EIGRP neighbors for process 22
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 10.32.29.175 Tu120 14 03:11:23 59 354 0 611025
i check the main vpn router where tunnel ends.it shows eigrp nei is stable from last 3 weeks.
any idea why nei is flapping
06-11-2009 04:29 AM
Hi Mahesh
Please check are u able to ping 64 to 1500 bytes end to end. The reason behind this is that eigrp always check the mtu from the above mentioned size. If you are not able to ping then neighborship will flap.
regards
shivlu jain
06-11-2009 09:09 PM
Hi,
thanks for reply
i am able to ping both sides by
64 to 1500 mtu size.
one side has 99% other is 100% success.
thanks
06-12-2009 04:26 AM
Hi have pasted the ping result.
it is still flapping.
telco says allis good from there end.
any idea why this is happening?
thanks
mahesh
06-19-2009 09:31 AM
What is the IP MTU of the tunnel. You can check this with show ip int Tunnel120. What type of device does this tunnel terminate on, any tunnels on this device or the other that are not flapping?
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