We got 2 redunant Cat 4506 L3 in the Disribution Layer.
To the Access Layer we make HSRP.
Always one VLAN (Data VLAN) per Access Switch is active on one Disribution Switch , the other VLAN (Voice VLAN) vice-versa on the other.
Now we noted, if the one of the Distr. Switches goes down (or the releted interface) not only the activ HSRP will change to the other Distr. Switch - also the active HSRP on the non-affectec Distr.Switch gets a interrupt (ca. 30 sec.).
What can be the reason ?
Here the sample configuration on one DistributionLayer Switch.
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