04-10-2013 03:03 AM - edited 03-07-2019 12:43 PM
Hi,
I can't find anywhere whether it is possible to create a vPC domain with 2 Nexus 5548UP switches, where only 1 Nexus 5548UP has a L3 daughter card.
Does anyone know if this is possible, supported, or both?
The question of "why" isn't important in this case, I know it's a weird configuration. ;-)
04-10-2013 03:13 AM
Hi Martijn,
I've never tried this, but I don't see why one of the switches having a Layer-3 module would mean that you can't establish vPC between the two switches. Apart from the peer-keepalive configuration, vPC is really a Layer-2 concept so Layer-3 capabilities shouldn't have any impact.
Also when you look look at the show vpc consistency-parameters command, there are no Layer-3 capabilities considered.
Sorry I can't provide a more definitive answer. I'd be interested to hear how you get on if/when you try it.
Regards
04-10-2013 03:30 AM
Interesting question.
The only thing that the NX-OS guide for the 5500 switches states is that the vPC peer switches must be of the same type. As stated by Steve vPC is a layer 2 technology so the daughter card is not required.
How do you propose to use the daughter card? Will this be used to provide the Layer 3 gateway for the non-VPC VLANs?
04-10-2013 04:23 AM
I was mostly just wondering what would happen, as I've found no mention of using the same hardware configuration in the documentation. Also, it would be a good thing to know what would happen if a Nexus 5548UP (with a L3 card) dies that gets replaced with a Nexus 5548UP without a L3 card.
I think I could make a case for a vPC pair where only 1 Nexus switch has a L3 card, where L2 has the priority for high availability, but I would probably always go for the same hardware configuration.
Thanks for the replies so far, it looks like I at least did not miss it in the documentation where it mentions "same hardware configuration" ;-)
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