[c-nsp] strange and sudden ATM drops - any ideas?

[Christopher J. Wolff]

Hello,

 

I have a peculiar situation with two ATM interfaces that occasionally drop
(and restart on their own, or when shut/no shut).  The router interfaces
have been replaced with new cards, as well as all connecting cables.  Thank
you in advance! Here are the configurations:

 

Router 1:

interface ATM4/0

 description OC3-TA

 ip address XXX.XXX.XXX.90 255.255.255.252

 no ip redirects

 no ip unreachables

 no ip proxy-arp

 ip accounting access-violations

 ip nat outside

 ip route-cache flow

 ip ospf network point-to-point

 ip ospf cost 1000

 load-interval 30

 no atm ilmi-keepalive

 crypto map Int-ATM4/0

 pvc rsvp-ctl 0/51 

  protocol ip XXX.XXX.XXX.89 broadcast

  no broadcast

 !

ATM4/0 is up, line protocol is up 

  Hardware is RS8234 ATMOC3

  MTU 4470 bytes, sub MTU 4470, BW 155000 Kbit, DLY 80 usec, 

     reliability 255/255, txload 1/255, rxload 1/255

  Encapsulation ATM, loopback not set

  Encapsulation(s): AAL5 

  1023 maximum active VCs, 1 current VCCs

  VC Auto Creation Disabled.

  VC idle disconnect time: 300 seconds

  Last input 00:00:00, output 00:00:00, output hang never

  Last clearing of "show interface" counters 00:06:12

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 9?

  Queueing strategy: Per VC Queueing

  30 second input rate 5000 bits/sec, 7 packets/sec

  30 second output rate 8000 bits/sec, 9 packets/sec

     2616 packets input, 337492 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

     3234 packets output, 440184 bytes, 0 underruns

     0 output errors, 0 collisions, 0 interface resets

     0 output buffer failures, 0 output buffers swapped out

 

Router 2:

interface ATM5/0

 ip address XXX.XXX.XXX.89 255.255.255.252

 no ip redirects

 no ip unreachables

 no ip proxy-arp

 ip accounting access-violations

 ip route-cache flow

 ip ospf network point-to-point

 load-interval 30

 atm clock INTERNAL

 no atm ilmi-keepalive

 pvc rsvp-ctl 0/51 

  protocol ip XXX.XXX.XXX.90 broadcast

  no broadcast

  oam-pvc 0

 !

 

ATM5/0 is up, line protocol is up 

  Hardware is ENHANCED ATM PA

  MTU 4470 bytes, sub MTU 4470, BW 149760 Kbit, DLY 80 usec, 

     reliability 255/255, txload 1/255, rxload 1/255

  Encapsulation ATM, loopback not set

  Encapsulation(s): AAL5

  4095 maximum active VCs, 1 current VCCs

  VC idle disconnect time: 300 seconds

  151 carrier transitions?

  Last input 00:00:04, output 00:00:00, output hang never

  Last clearing of "show interface" counters 00:26:10

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 9?

  Queueing strategy: Per VC Queueing

  30 second input rate 8000 bits/sec, 7 packets/sec

  30 second output rate 6000 bits/sec, 5 packets/sec

     6444 packets input, 901127 bytes, 0 no buffer

     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

     2 input errors, 2 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

     5341 packets output, 637732 bytes, 0 underruns

     0 output errors, 0 collisions, 0 interface resets

     0 output buffer failures, 0 output buffers swapped out