Hi, I am still experiencing unknown unicast flooding with the Catalyst 6509 VSS 1440 configuration.
I have tried two more tests, to check if the flood will stop: 1. I turned off the routed-mac feature #sh mac-addr aging-type routed Routed MAC aging : disabled 2. I configured the arp timeout for each VLAN interface to 900 seconds To test if this solved the problem, I enabled 4 interfaces on Switch 2, and as soon as that was done, 100 mbps flood of unknon unicast was sent to all trunk ports. I pasted below the MAC address aging time that is currently 3 times the syncronisation time: Syncronisation time: Global Status: Status of feature enabled on the switch : on Default activity time : 160 Configured current activity time : 640 Mac address aging: #sh mac-addr aging-time Vlan Aging Time ---- ---------- Global 1920 no vlan age other than global age configured I am really out of ideas as to what can cause this loop, that then generates the unknown unicast flood. Has anyone experienced anything similar and can offer any advice on why this is happening? Thank you Catalin --- On Fri, 7/8/09, Eric Cables <ecab...@gmail.com> wrote: From: Eric Cables <ecab...@gmail.com> Subject: Re: [c-nsp] VSS 1440 issues To: "Kevin Loch" <kl...@kl.net> Cc: "cisco-nsp@puck.nether.net" <cisco-nsp@puck.nether.net> Date: Friday, 7 August, 2009, 8:43 AM Agreed, your mileage may vary on the exact timers to use (I ended up at 900 seconds), but synchronizing MAC and ARP aging timers should solve your unicast flooding issues, assuming the traffic is to legitimate destinations. Have you captured any traffic to identify the destination of flooded traffic? -- Eric Cables On Thu, Aug 6, 2009 at 9:35 PM, Kevin Loch <kl...@kl.net> wrote: > C and C Dominte wrote: > > Thank you for your advice, however, increasing the timers >> did not work. >> >> >> I powered down the active linecards from switch 2 >> yesterday to see if it stopped the unicast flood, which it did. >> >> Today I increased the mac address syncronisation activity >> time to 640 and the mac address aging time to 1920 (3x640) as below: >> > > While I have not run 6500's in VSS mode I have run into similar unicast > flooding with certain non-VSS configurations of 6500's. The most > reliable fix I have found is "arp timeout 120" in the affected vlan > interfaces. > > - Kevin > > _______________________________________________ > cisco-nsp mailing list cisco-nsp@puck.nether.net > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ > _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/ _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
