[c-nsp] cisco VPC problem on nx 3064

[Friedrich, Gregor]

Hello all

For the vpc feature peer-switch the spanning tree config has to be *exactly the same* on both switches!  

Also I would suggest to change the STP priority from default 32768 , otherwise some other new connected switch could become the new root bridge... 

Regards Gregor 


-----Ursprüngliche Nachricht-----
Von: cisco-nsp <cisco-nsp-bounces at puck.nether.net> Im Auftrag von BASSAGET Cédric
Gesendet: Donnerstag, 10. Oktober 2019 12:28
An: Nathan Lannine <nathan.lannine at gmail.com>
Cc: Cisco-nsp <cisco-nsp at puck.nether.net>
Betreff: Re: [c-nsp] cisco VPC problem on nx 3064

Hi Nathan,
My linux boxes are not sending BPDUs. They're running bonds in bond-mode 802.3ad. No bridge stuff here.
My last test was :

N3K-eqx-pa3-1# show running-config spanning-tree spanning-tree mode mst spanning-tree mst configuration
  instance 1 vlan 2-4094
interface port-channel4091
  spanning-tree port type network


After re-checking my config I saw that I had a priority set for vlan 40 on switch 1. I removed it, put back all my vlans un MST0 and it seems it fixed my problem...

Regards,
Cédric

Le jeu. 10 oct. 2019 à 11:16, Nathan Lannine <nathan.lannine at gmail.com> a écrit :

> On Thu, Oct 10, 2019 at 2:36 AM BASSAGET Cédric < 
> cedric.bassaget.ml at gmail.com> wrote:
>
>> Hello aain,
>> It seems my problem is related to STP.
>> After rebooting a switch, VPC peer-link is disabled by spanning tree :
>>
>> > interface port-channel13
>> >   switchport mode trunk
>> >   switchport trunk allowed vlan 40
>> >   vpc 13
>> >
>> > interface port-channel14
>> >   switchport mode trunk
>> >   switchport trunk allowed vlan 40
>> >   vpc 14
>> >
>>
>>
> This really only makes sense if the linux boxen are sending bpdus, but 
> you could try setting the etherchannel interfaces to "spanning-tree 
> port type edge trunk".  Of course, if you do so, you should probably run "brctl show"
> on your linux endpoints just to ensure they are not somehow running 
> their bond interfaces in a bridge and sending bpdus.
>
>
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