VSS & arp

Unanswered Question
Mar 10th, 2010

I have a VSS setup of 6513 chassis. The Access switches are connected to the VSS through MEC. There's a MEC to an External Switch where all my next hops Routers,Firewalls, WAN are conencted. All the SVI's config on VSS. VSS is running safe harbour IOS & config as per cisco white paper.

I am observing a random issue of some of the VLAN users loose conenctivity to the next hops connected on the external switches.

As a quick workaround clear ip arp on VSS resolves this.

As a resolution to this i am configuring indvidual trunks from the External Switch thereby STP blocking one of the link to the VSS. Since then there is no loss of connectivity.

Has anyone encountered the same problem ? suggestion for the use of the MEC for the external switch

I have this problem too.
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CSCO11167812 Thu, 03/11/2010 - 05:16


Can you provide the following commands

show switch virtual

show switch virtual dual-active sum

and the configuration lines of the running config for

switch virtual domain

Kind regards,


CSCO10971895 Sat, 06/14/2014 - 17:03

Hi... I am having the same problem on 6509 running on image : s72033-adventerprisek9-mz.151-2.SY.bin"

Could you tell e if you were able to get this issue resolved ? and if yes how ?


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