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HSRP NEXUS

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Last Modified: 2014-03-11
I was curious if a separate HSRP Group should be employed for each SVI on a Core Nexus Switch.  See below.

Should each Vlan have a separate HSRP instance or would one or two instances for HSRP be adequate for 10 or 20 Vlans??

interface Vlan3
  no shutdown
  ip address 131.133.134.131/27
  ip ospf authentication message-digest
  ip ospf message-digest-key 1 md5 3 9125d59c18a9b015
  ip router ospf 10 area 0.0.0.0
  hsrp version 2
  HSRP 3
    preempt
    priority 120
    ip 131.133.134.129

interface Vlan6
  ip address 131.133.134.163/27
  ip ospf authentication message-digest
  ip ospf message-digest-key 1 md5 3 9125d59c18a9b015
  ip router ospf 10 area 0.0.0.0
  hsrp version 2
  HSRP 6
    preempt
    priority 120
    ip 131.133.134.161

interface Vlan7
  ip address 131.133.134.195/27
  ip ospf authentication message-digest
  ip ospf message-digest-key 1 md5 3 9125d59c18a9b015
  ip router ospf 10 area 0.0.0.0
  hsrp version 2
  HSRP 7
    preempt
    priority 120
    ip 131.133.134.193
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Network Architect
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Commented:
Apparently most platforms will not support more than 256 HSRP instances ...what do you do if you have more than 256 Vlan's
You may want to consider migrating to a traditional hierarchy of core --> distribution --> access where you have layer 3 between your core and distribution layers and deploy your gateways on your distribution devices. This is an assumption of your architecture being a collapsed core design where all layer 3/gateway traffic and subnets reside in the core devices of your infrastructure.
some oneNetwork Architect
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Top Expert 2014

Commented:
You wouldn't generally provide L2 redundancy at the same device for that many VLANs.  As Jordan Medlen said, this is usually separated at the distribution layer.  This allows the scalability you may require.
To answer the OP's question...

Should each Vlan have a separate HSRP instance or would one or two instances for HSRP be adequate for 10 or 20 Vlans??

...craigbecks reply does answer that question. Is it the only solution, no, but as far as direct replies, it answers the question. I always look to provide better alternative solutions where they exist, rather than only providing the answer to the question given.
some oneNetwork Architect
CERTIFIED EXPERT
Top Expert 2014

Commented:
I didn't say Jordan's comment shouldn't be included in a split.  In the objection I said:

The correct answer is ID: 39752167

The selected answer was just a supplement to the initial comment I made, so the OP has just selected any comment by me as the answer in order to acknowledge that I was correct and award points.

The points awarded were significantly less than the assist too
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