topic Technically speaking the vPC in Application Networking

Cisco Nexus 5672 and 9372 vPC Error

yannaing00 — Fri, 29 Apr 2016 05:49:41 GMT

Hi All,

I'd like to know vPC configuration. Now, I am trying to connect cisco nexus 5672 and 9372 switch with vPC protocol. But I can't configure about this two switch and can't communicate each other via vPC link. Please see the below error message.

Whats the configuration you

Mark Malone — Fri, 29 Apr 2016 08:26:06 GMT

Whats the configuration you currently have in place , looking at the screenshot the peer-link is still down , can you post what your currently have

Hi,

sachintambat — Fri, 29 Apr 2016 08:38:55 GMT

Hi,

From the Output i can see the peer link is not connected or down. Please check it.

interface port-channel(number)
description <<Peer Link Between nexus>>
switchport mode trunk
spanning-tree port type network
vpc peer-link

interface Ethernet1/49 (of both switch)
switchport mode trunk
channel-group 100 mode active

interface port-channel100
switchport mode trunk
vpc 100

Please see the below attached

yannaing00 — Fri, 29 Apr 2016 10:26:55 GMT

Please see the below attached file and config.

Hi,

sachintambat — Fri, 29 Apr 2016 10:54:38 GMT

Hi,

Design itself is not correct.

check below link for more information.

http://www.cisco.com/c/en/us/products/collateral/switches/nexus-5000-series-switches/configuration_guide_c07-543563.html

HI

Mark Malone — Fri, 29 Apr 2016 11:24:59 GMT

Just curious why are you saying the design is incorrect the vpc peer-keepalive is up and routable so his layer 2 peer-link should form between a 5k and 9k the config is correct standard trunk with vpc peer-link set under the po , are you saying its due to one being a 5k and the other a 9k ?

There's definitely a couple of best practices missing from vpc domain but that should not stop the peer-link forming ,, peer-gateway and peer-switch should be there and ip arp synchronize

Are your interfaces showing up/up in peer-link , are you getting any logs for this failing

Yes its bcoz its not best

sachintambat — Fri, 29 Apr 2016 12:23:57 GMT

Yes its bcoz its not best practice to connect 5k and 9k in pair.

Yes I wouldn't agree with

Mark Malone — Fri, 29 Apr 2016 12:54:59 GMT

Yes I wouldn't agree with mixing platforms never tried it either always try follow the best practice docs I would have thought though if both support vpc domain and clustering it might work but I guess not if its not forming correctly and config looks ok ,that's one way to find out

found with the 9ks as well though there missing a lot of features and they only run a stripped down version of nx-os compared to standard nexus switches

Hi All,

yannaing00 — Sat, 30 Apr 2016 09:05:18 GMT

Hi All,

Thanks for your discussion. I want to know for one question. Currently, I am trying to use nexus 5k and 9k with vPC protocol. Is vPC support different hardware version or not? I can't find any documentation for this scenario. Please let me know if you have any cisco documentation or reference for my topology. Before, I have already used vPC feature in same hardware version (nexus 5672 to nexus 5672, nexus 9372 to nexus 9372).

Regards,

Technically speaking the vPC

Tyler Jeffords — Thu, 12 May 2016 03:43:09 GMT

Technically speaking the vPC may come up if vPC configurations and the consistency parameters match on both sides, however you are only asking for trouble as the two have completely different hardware characteristics (in terms of internal architecture, forwarding, queuing, and security). From a TAC/BU standpoint this is not supported since vPC is only tested and validated by Q/A using the same platform and model, there is too many variations of platforms/models to test and support them all. vPC is only supported between identical switches.