[c-nsp] Strange problem with Cat6500 freeze

[Holemans Wim]

Not exactly the same but we had an 'automatic' reboot on a Sup720 and Sup32 during a broadcast storm after upgrading tot SXI4a. Before the upgrade the machine kept running (unresponsive but running) until the cause of the broadcast storm was removed.
Something seems to have changed in SXI4a.... 

Wim Holemans
  

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Jens S Andersen
Sent: maandag 13 december 2010 19:49
To: Robert Hass
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] Strange problem with Cat6500 freeze

Hi

We har the exact same problem with 2 6503E/Sup32 routers  after upgrading to 
SXI4a.
We downgraded to SXI3, and the problem went away.
Maybe it's a SXI4a 'feature'.

-Jens


>Hi

>I have network where core-devices are Cisco Catalyst 6506-E with
>Sup32/PFC3B. I last month We had two times problem. One time first 6500
>'freezes' and second time second 6500 'freezes' Freezes means machine was
>powered up, alarm was present (diode on supervisor), console wasn't
>responding at all, freeze 6500 created a lot of loops on all VLANs inside
>network (%SW_MATM-4-MACFLAP_NOTIF: Host xxxx.xxxx.xxxx in vlan XX is
>flapping between port XX and port XX), all ports connected to 'freeze' 6500
>was UP, LACP for PortChannels went down. Hard reboot (power off + power on)
>helps both times. There wasn.t any crashdump in
>flash/bootflash/sup-bootdisk/disk. Most problem was caused by loop created
>by freeze 6500 - as all network was overloaded. How I could prevent these
>issue in future ? Maybe storm-control for broadcasts ? Did anybody
>occurred similar problem with 6500 ? After investigate both freezes was
>probably caused by radom disabled/enabled NetFlow ('ip flow ingress') on few
>SVIs.

>Some facts more about both 6500 configurations:
>- Both running 12.2(33)SXI4a IOS. Upgrade was done 1 month ago.
>- Before machines was running 12.2(33)SXH4 never occurred similar problem
>- eBGP (230k prefixes), 3-4 full table BGP peers + iBGP (20 peers rr-clients)
>- IS-IS
>- A little MLS QOS (policing) - 1-2 service-polcies on SVIs
>- Control Plane Policing implemented
>- Sometimes netflow v5 exporting from SVI
>- Load around 40% (show catalyst6000) + 1.5Mpps (sh platf hardw capa pfc)
>- Dual PSs
>- Only ports GE on Sup-32 heavy used
>- WS-X6408A-GBIC linecards but used only 1-2 ports with a little load
>(~50-200Mb)
>- ~300 VLANs
>- ~50 SVIs

>Robert
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Jens S Andersen                 Email:  jsa at adm.aau.dk
Aalborg University              Telf:   9940 9464
Selma Lagerlöfs Vej 300, 4.2.59 Fax:    9940 7593
9220 Aalborg
Denmark
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