Cisco Nexus 5672 and 9372 vPC Error

[yannaing00]

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.

[Mark Malone]

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

[yannaing00]

Please see the below attached file and config.

[sachintambat]

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

[Mark Malone]

HI

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

[sachintambat]

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

[Mark Malone]

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

[yannaing00]

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,

[Tyler Jeffords]

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.

[sachintambat]

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