[j-nsp] Correct config for SRX port channel -> Cisco

Phil Mayers p.mayers at imperial.ac.uk
Thu Jul 25 12:19:47 EDT 2013


On 24/07/13 17:11, Phil Mayers wrote:
> On 24/07/13 17:01, Olivier Benghozi wrote:
>> Hi Phil,
>>
>> what is the Cisco model & IOS?
>
> It's actually an Nexus 7009 running NX-OS.
>
>>
>> Did you create the vlan in the vlan database in your Cisco switch? :)
>
> Yep
>
>>
>> Maybe try switchport nonegotiate...
>
> No such command on NX-OS, there's no DTP.
>

In case people are curious, this seems to be a bug on the Cisco side.

If the port-channel is in "trunk" mode, the Cisco is sending the LACP 
PDUs tagged with the native vlan, as we have "vlan dot1q tag native" 
enabled. This an error IMO, as LACP is not part of a VLAN (it is doing 
the same for LLDP, FWIW)

The SRX, correctly I believe, is ignoring the tagged LACP PDUs.

I can work around this by using sub-interfaces on the Cisco side, but 
it's yucky. Oh well.

Thanks all for the input.


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