[j-nsp] M20 FPC detaching/going offline for no apparent reason

[Bill Petrisko]

Has anyone seen this behavior before?

M20 (5.6R2.4) FPC3 detached/went offline.

Ok, replaced FPC.

A week later, the replacement FPC does the same.
These are the only log messages:

Sep 30 20:53:09 jr1.iad-re0 chassisd[546]: CHASSISD_FRU_EVENT: scb_recv_slot_detach: FPC slot 3 detach
Sep 30 20:53:09 jr1.iad-re0 chassisd[546]: CHASSISD_IFDEV_DETACH_FPC: ifdev_detach(3)

Looking at a show chassis fpc detail shows it is down:

Slot 3 information:
  State                               Dormant
  Logical slot                      0
  Temperature                      31 degrees C / 87 degrees F
  Total CPU DRAM                    8 MB
  Total SRAM                        0 MB
  Total SDRAM                     128 MB
  Total notification SDRAM          0 MB
  I/O Manager ASIC information        Version unknown, Foundry unknown, Part number 0


Reseating the slot, it comes right back up:

Sep 30 21:41:14 jr1.iad-re0 ssb CM(0): Internal error. Removal on slot 3 but slot in empty state
Sep 30 21:41:20 jr1.iad-re0 /kernel: TNP: adding neighbor 19 to interface fxp1.
Sep 30 21:41:24 jr1.iad-re0 tnp.bootpd[97372]: BOOTPD_VERSION: Version: TNP.BOOTPD release 5.6R2.4 built by builder on 2003-02-14 22
:55:55 UTC
Sep 30 21:41:25 jr1.iad-re0 tnp.bootpd[97372]: BOOTPD_BOOTSTRING: Boot string: boot 1 fpc.jbf
Sep 30 21:41:25 jr1.iad-re0 tnp.tftpd[97374]: TFTPD_CONNECT_INFO: TFTP read from address 19 port 1024 file fpc.jbf
Sep 30 21:41:30 jr1.iad-re0 tnp.tftpd[97374]: TFTPD_SENDCOMPLETE_INFO: Sent 3518 blocks of 1024 and 1 block of 564 for file '/usr/sh
are/pfe/fpc.jbf' 
Sep 30 21:41:40 jr1.iad-re0 /kernel: pfe_listener_connect: conn established: listener idx=4, tnpaddr=19
Sep 30 21:41:41 jr1.iad-re0 chassisd[546]: CHASSISD_FRU_EVENT: fpc_m40_recv_restart: FPC slot 3 restart
Sep 30 21:41:44 jr1.iad-re0 chassisd[546]: CHASSISD_FRU_EVENT: scb_recv_slot_attach: FPC slot 3 attach
Sep 30 21:41:44 jr1.iad-re0 chassisd[546]: CHASSISD_IFDEV_CREATE_NOTICE: create_pics: add ifd ge-3/0/0
Sep 30 21:41:44 jr1.iad-re0 chassisd[546]: CHASSISD_IFDEV_CREATE_NOTICE: create_pics: add ifd ge-3/1/0
Sep 30 21:41:44 jr1.iad-re0 chassisd[546]: CHASSISD_IFDEV_CREATE_NOTICE: create_pics: add ifd ge-3/2/0
Sep 30 21:41:44 jr1.iad-re0 chassisd[546]: CHASSISD_IFDEV_CREATE_NOTICE: create_pics: add ifd ge-3/3/0

show chassis fpc detail looks normal again:

Slot 3 information:
  State                               Online    
  Logical slot                      3
  Temperature                      31 degrees C / 87 degrees F
  Total CPU DRAM                    8 MB
  Total SRAM                        1 MB
  Total SDRAM                     128 MB
  Total notification SDRAM         24 MB
  I/O Manager ASIC information        Version 2.0, Foundry IBM, Part number 0
  Start time:                         2004-09-30 21:42:19 MST
  Uptime:                              6 minutes, 8 seconds


Any ideas?

String of bad FPC's?
Software issue?
Chassis/backplane issue?

thanks
bill