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Down Interface flap

Posted on 2007-11-15
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Last Modified: 2012-08-13
I have two 3700 routers and I keep getting this error, what do I need to look at to trouble shoot this?

BGP-5-ADJCHANGE: neighbor xxx.xxx.xxx.xxx Down Interface flap
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Question by:CMILLER
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by:Jan Springer
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What does a 'show interface' of your upstream indicate?

If the circuit is going down/up and your BGP session is for a provider connected to that circuit, your BGP will flap, as well.
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by:CMILLER
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Here is a sh int of the router that is reporting the down interface flap

Serial1/0 is up, line protocol is up
  Hardware is M4T
  Description: Northwest
  Internet address is 214.3.240.134/30
  MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
     reliability 156/255, txload 1/255, rxload 1/255
  Encapsulation HDLC, crc 16, loopback not set
  Keepalive set (10 sec)
  Restart-Delay is 0 secs
  Last input 00:00:06, output 00:00:00, output hang never
  Last clearing of "show interface" counters 00:34:31
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: weighted fair
  Output queue: 0/1000/64/0 (size/max total/threshold/drops)
     Conversations  0/15/256 (active/max active/max total)
     Reserved Conversations 0/0 (allocated/max allocated)
     Available Bandwidth 1158 kilobits/sec
  5 minute input rate 1000 bits/sec, 2 packets/sec
  5 minute output rate 8000 bits/sec, 3 packets/sec
     3871 packets input, 1413655 bytes, 0 no buffer
     Received 151 broadcasts, 0 runts, 0 giants, 0 throttles
     27597 input errors, 13514 CRC, 0 frame, 137 overrun, 0 ignored, 13946 abort

     7049 packets output, 2479031 bytes, 0 underruns
     0 output errors, 0 collisions, 13 interface resets
     0 output buffer failures, 0 output buffers swapped out
     13 carrier transitions     DCD=up  DSR=up  DTR=up  RTS=up  CTS=up
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by:CMILLER
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Also, here is my bgp and eigrp config.

router eigrp 335
 redistribute connected
 redistribute static
 redistribute bgp 4021
 network 11.220.219.0
 network 10.112.0.0 0.0.0.3
 network 10.112.0.8 0.0.0.3
 neighbor 10.112.0.1 FastEthernet0/0
 neighbor 10.112.0.9 FastEthernet0/1
 no auto-summary

router bgp 4021
 no synchronization
 bgp log-neighbor-changes
 network 11.220.219.0
 network 10.112.0.0 mask 255.255.255.252
 network 12.1.240.132 mask 255.255.255.252
 neighbor 12.1.240.133 remote-as xxxx
 no auto-summary
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Jan Springer earned 500 total points
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13 carrier transitions and all of those errors are not good.

If your ISP "owns" the circuit, ask them to take it down for up to one hour during your low peak for testing.  Do a "clear count s1/0", no quotes, first and monitor the errors between the clearing of the counters and the maintenance.
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