Hello my dear colleagues, I'm seeing some WriteDrops on the primary management module of my foundry BigIron 4000. I have been searching for something since I a lot of CRC-Errors on some Switches connected to my BigIron4000. The interesting thing was that I couldn't see any outgoing errors but the guys on the other end was incoming CRCs. The connection to the remote-guy is terminating on my port 2/1 and I had already moved it to 2/8. Module 2 is the backup management module, module 1 the active one. Both are B8GMRs (gen2).
The problem is happening with traffic on module 1 and module 2 but all of the traffic is passing trough module 1. I have enabled the "debug hw"-command and the log shows: Jun 16 02:46:23:I:System: Slot 1 Write Sequence Drop 26312 within 5 minutes. Jun 16 02:45:53:I:System: Slot 1 Write Sequence Drop 13851 within 5 minutes. Jun 16 02:32:23:I:System: Slot 1 Write Sequence Drop 1 within 5 minutes. Bigiron4000>show backplane _______________________________________________________________________ Slot Mod FreeQ DMADrop BPDrop WriteDrop Last ----------------------------------------------------------------------- 1 B8GMR 898 0 0 47480 D:0 H:0 M:32S:3 2 B8GMR 916 0 0 0 NEVER 3 B24E 900 0 0 0 NEVER As you can see a show backplane outputs a lot of WriteDrops. We had been experiencing some problems with this switch a week ago: the (unused but present) B24E-module in slot 4 was shown as being removed although no one touched it. Removing and inserting the module didn't help so I guess it most have died. The module is still inserted in the switch but I issued a "no module 4"-command and it is no longer being shown. I have now removed the broken module and cold-powered the switch but the WriteDrops and the incoming crc errors on the remote side are still there. Bigiron4000>Show backplane (after cold start and a few minutes of operation.) _______________________________________________________________________ Slot Mod FreeQ DMADrop BPDrop WriteDrop Last ----------------------------------------------------------------------- 1 B8GMR 914 0 0 4491 D:0 H:0 M:7 S:4 2 B8GMR 916 0 0 0 NEVER 3 B24E 900 0 0 0 NEVER Is there some sort of testing mode I can use to start some diagnostinc procedures on the modules? That's what the remote switch is seeing after a few minutes of operation with a little bit of traffic. Ethernet Packets Collisions Errors Port [Receive Transmit] [Recv Txmit] [InErr OutErr] 2/1 88626 1620 0 0 156 0 Any idea what's wrong here? Maybe my chassis / backplane is broken or is it the active managament module in slot1? Thanks, Gunther
