2510-48 (j9020a) slow on one VLAN

[kurtbuff]

Howdy,

First post here. I've got one switch, noted in subject line, that periodically becomes unresponsive to pings on its management VLAN, and user complain of application slowness on one of the VLANs. This switch serves end users and a couple of printers, and is connected to a 3400cl-40, which serves as my core switch.

The log shows lots of this kind of error:

system: Out of pkt buffers; miss count: 1666003059

plus this set, across multiple ports:

I 10/25/13 10:02:47 ports: port 41 is Blocked by STP
I 10/25/13 10:02:49 ports: port 41 is now on-line
W 10/25/13 10:03:08 FFI: port 41-Excessive Broadcasts. See help.

If I reboot the switch, it's clear for a while.

I'm attaching a file with the output from 'sho tech all'.

I suspect a layer 2 loop, but am having a hard time determining if that's the case, or if there's a hardware problem, or if there's something else going on.

One thing I noted in the attached file is this stanza, which doesn't make sense to me, as the 3400cl-48 has priority 0:

  CST Root MAC Address : 0016b9-587a00
  CST Root Priority    : 8192
  CST Root Path Cost   : 0
  CST Root Port        : This switch is root

Any comments or analysis appreciated.

Thanks,

Kurt

P.S. This thread has been moved from Switches, Hubs, Modems (Legacy ITRC forum) to ProCurve / ProVision-Based. -HP Forum Moderator

[Vince_Whirlwind]

Enable BPDU guard on the ports that are not connected to your "Core".

Configure broadcast limiting to, say 10%.

Enable IGMP on both switches and disable querier on the 2510.

[kurtbuff]

> Enable BPDU guard on the ports that are not connected to your "Core".

     Hmmm...

     BPDU is already set for ports 1-48, see:

          spanning-tree 48 bpdu-protection
          spanning-tree bpdu-protection-timeout 600 priority 2

> Configure broadcast limiting to, say 10%.

      I've looked through the manuals, and don't see how to limit broadcasts. Any help on that?

> Enable IGMP on both switches and disable querier on the 2510.

      This is done on a per-VLAN basis for both the 2510 and the 3400cl, correct? I've now set this up on the three customer-facing VLANs.

Thanks,

Kurt

[kurtbuff]

> Configure broadcast limiting to, say 10%.

     OK - I found it on teh intarwebs - it's not in the manuals I have.

     int 1-48 broadcast-limit <integer>

     I presume that the range (0-99) is a percentage?

     Thanks,

     Kurt

[Richard Brodie_1]

The log shows lots of this kind of error:

system: Out of pkt buffers; miss count: 1666003059

They leak packet buffers until they ran out, then lose spanning tree BPDUs, declare themselves root and BANG! Been there, done that. Moral: don't run 2008 firmware.