[c-nsp] 12.2.28sb on 7200 looped interfaces

[Eric Kagan]

I did a few searches and did not get any hits.  We upgraded a router to
12.2.28sb a few weeks back.  Started seeing interfaces show up/up (looped)
but yet still passing traffic.  Router reboot would clear some and they
would come back.  Put it back to 12.2.25 S9 and the interfaces are no longer
looped.  It was mostly cosmetic, but gave our NMS some issues.
 
Just thought I would share in case anyone is seeing anything similar or
strange with sb on a 7200.  Mostly PA-MC-T3 cards.

Eric
 
 
wma>show ver
Cisco IOS Software, 7200 Software (C7200-P-M), Version 12.2(28)SB, RELEASE
SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2006 by Cisco Systems, Inc.
Compiled Fri 17-Mar-06 23:44 by richv
 
ROM: System Bootstrap, Version 12.1(20000710:044039) [nlaw-121E_npeb 117],
DEVELOPMENT SOFTWARE
 
wma uptime is 3 weeks, 2 days, 16 hours, 6 minutes
System returned to ROM by reload at 05:18:59 edt Tue Jun 20 2006
System restarted at 05:19:58 edt Tue Jun 20 2006
System image file is "slot0:c7200-p-mz.122-28.sb.bin"
 
Cisco 7206VXR (NPE400) processor (revision A) with 491520K/32768K bytes of
memory.
Processor board ID 26812694
R7000 CPU at 350Mhz, Implementation 39, Rev 3.2, 256KB L2 Cache
6 slot VXR midplane, Version 2.6
 
Last reset from power-on
 
PCI bus mb0_mb1 (Slots 0, 1, 3 and 5) has a capacity of 600 bandwidth
points.
Current configuration on bus mb0_mb1 has a total of 580 bandwidth points.
This configuration is within the PCI bus capacity and is supported.
 
PCI bus mb2 (Slots 2, 4, 6) has a capacity of 600 bandwidth points.
Current configuration on bus mb2 has a total of 180 bandwidth points
This configuration is within the PCI bus capacity and is supported.
 
2 FastEthernet interfaces
46 Serial interfaces
9 ATM interfaces
3 Channelized T3 ports
125K bytes of NVRAM.
 
20480K bytes of Flash PCMCIA card at slot 0 (Sector size 128K).
4096K bytes of Flash internal SIMM (Sector size 256K).
Configuration register is 0x2102
 
 
 
 
wma>show int | incl looped
Serial2/0/10:1 is up, line protocol is up (looped)
Serial3/0/5:1 is down, line protocol is down (looped)
Serial3/0/18:1 is up, line protocol is up (looped)
Serial3/0/19:1 is up, line protocol is up (looped)