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Forum Replies

  1. Hi Yevgeniy,

    Good question and there’s a long answer…

    Originally on the 3550 and some of the 6500 supervisors only 16 HSRP groups were allowed but this limitation applied only to a single interface. You could use the same group number on different interfaces without any issues. On newer platforms this 16 limit doesn’t apply anymore…the 3750 supports 32 groups I think and my 2800 router supports 255.

    About authentication…originally the RFC 2338 standard described authentication but it was removed in RFC 3678 since it wasn’t secure. Not sure which RFC the Cisco i

    ... Continue reading in our forum

  2. Hi Ivaylo,
    The short answer to your question is that you will need a separate VRRP instance for each vlan that you want to have a highly available gateway.

    I have attached a new topology to discuss this. In it, you will see that Computers A and B are in different VLANs (A and B). Switch A and Switch B are both connected to the access-layer Switch C. Note: These connections must be configured as trunks, let’s say the modern 802.1Q standard with both VLAN A and VLAN B allowed. Additionally, it would be a good idea to have Switch A and Switch B directly connec

    ... Continue reading in our forum

  3. Hi,

    thank you for confirming. It’s clear now.


  4. Hi Andrew,

    Just tested this, when the backup VRRP becomes the master, it uses its own timer values. Not the ones from the failed master.


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