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SVI failover?

Posted on 2014-12-02
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Last Modified: 2014-12-03
We've recently stretched a vlan across a layer 2 link (vlan tagged on a trunk) connecting two different datacenters.  I posed a question to a consultant  (DR planning) we've been using regarding the SVI for the stretched vlan.  The SVI is assigned to a switch in DC1 and all servers in this vlan use the svi as their default gateway.  In the event there is an issue with the switch in DC1, the SVI doesn't somehow get assigned to the switch in DC2, correct?  Like a sort of failover scenario for the SVI.

The consultant we've been working with claims this will work but I'm not so sure.  I don't have a lab environment to test this out in so I'm not sure how I can even come up with a good test for it.

I'm thinking if there is a failure with the switch in DC1, we would have to change the default gateway for any servers in that vlan to the svi in DC2.  Unless we use a HSRP or VRRP for failing over that default gateway.

The switches in each datacenter are Cisco 3850s.s
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Don Johnston earned 2000 total points
ID: 40477715
In the event there is an issue with the switch in DC1, the SVI doesn't somehow get assigned to the switch in DC2, correct?
Correct.
The consultant we've been working with claims this will work but I'm not so sure.
Based on the information provided... I'd be looking for a new consultant. ;-)

But there could be some additional information that we're lacking, so they could be thinking about using HSRP or VRRP but haven't gone into that detail yet.
I'm thinking if there is a failure with the switch in DC1, we would have to change the default gateway for any servers in that vlan to the svi in DC2.  Unless we use a HSRP or VRRP for failing over that default gateway.
You are absolutely correct.
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Author Closing Comment

by:Health Payment Systems
ID: 40479680
To be fair, he is the DR consultant not necessarily the network consultant.  

I just wanted to double check with someone that I was on the right path.  Thanks for the help.
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