[j-nsp] Determine reason for interface flapping

[Joe Shen]

Hi,


I noticed one of SONET interface on our router flaps
from time to time. 

The log file shows:

=======================

Oct 12 12:53:06  router-2 inetd[2655]:
/usr/libexec/telnetd[12047]: exit status 0x100
Oct 12 12:53:15  r3-b-zjhz-1 mib2d[2765]:
SNMP_TRAP_LINK_DOWN: ifIndex 69, ifAdminStatus up(1),
ifOperStatus down(2), ifName so-4/3/0
Oct 12 12:53:15  router-2 rpd[2766]: RPD_ISIS_ADJDOWN:
IS-IS lost L1 adjacency to router-1 on so-4/3/0.0,
reason: Interface Down
Oct 12 12:53:15  router-2 fpc4 LCHIP(3): 1 new errors
in LSIF
Oct 12 12:53:16  router-2 mib2d[2765]:
SNMP_TRAP_LINK_DOWN: ifIndex 70, ifAdminStatus up(1),
ifOperStatus down(2), ifName so-4/3/0.0
Oct 12 12:53:17  router-2 fpc4 LCHIP(3): 1 new errors
in LSIF
Oct 12 12:53:29  router-2 fpc4 last message repeated 6
times
Oct 12 12:56:17  router-2 rpd[2766]: RPD_ISIS_ADJDOWN:
IS-IS lost L1 adjacency to router-1 on so-4/3/0.0,
reason: Interface Down
Oct 12 12:56:17  router-2 mib2d[2765]:
SNMP_TRAP_LINK_DOWN: ifIndex 69, ifAdminStatus up(1),
ifOperStatus down(2), ifName so-4/3/0
Oct 12 13:03:25  router-2 rpd[2766]: RPD_ISIS_ADJDOWN:
IS-IS lost L1 adjacency to router-1 on so-4/3/0.0,
reason: Interface Down
Oct 12 13:03:25  router-2 mib2d[2765]:
SNMP_TRAP_LINK_DOWN: ifIndex 69, ifAdminStatus up(1),
ifOperStatus down(2), ifName so-4/3/0
Oct 12 13:04:56  router-2 mib2d[2765]:
SNMP_TRAP_LINK_DOWN: ifIndex 69, ifAdminStatus up(1),
ifOperStatus down(2), ifName so-4/3/0
Oct 12 13:04:56  router-2 rpd[2766]: RPD_ISIS_ADJDOWN:
IS-IS lost L1 adjacency to router-1 on so-4/3/0.0,
reason: Interface Down
Oct 12 13:05:02  router-2 mib2d[2765]:
SNMP_TRAP_LINK_DOWN: ifIndex 69, ifAdminStatus up(1),
ifOperStatus down(2), ifName so-4/3/0
Oct 12 13:05:02  router-2 rpd[2766]: RPD_ISIS_ADJDOWN:
IS-IS lost L1 adjacency to router-1 on so-4/3/0.0,
reason: Interface Down
===============================================


The flapping happens around  30min. How can I
determine the reason?

thanks 

Joe




		
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