[c-nsp] trouble with link aggregation on WS-X6716-10GE [SOLVED]

Sebastian Beutel sebastian.beutel at rus.uni-stuttgart.de
Wed Mar 16 12:58:54 EDT 2016

Hi List,

    thanks for all the ideas, we finaly made it work and i don't want to
keep the solution a secret. We discovered that there is an "partner admin
key <nr>" Option configurable on an Alcatel Switch and the number seems to
must match the number of the port-channel on the cisco side... After fixing
this the links on our side aggregated like a charm as if nothing ever had


On Wed, Mar 09, 2016 at 03:05:52PM +0100, Sebastian Beutel wrote:
> Hi List,
>     i recently encountered a strange problem with a lacp port-channel on a
> WS-X6716-10GE line card with a DFC3C. Both members reside on the same line
> card, one of them is shut for a long time. The other end is an alcatel
> customer switch.
>     When i did a "no shut" on the second port, it refused to join the port
> channel (Po17) and instead a second portchannel (Po17A) appeared, waiting to
> be aggregated:
> 17     Po17(SU)        LACP      Te1/4(P)
> 17     Po17A(SN)       LACP      Te1/10(w) 
> I have seen similar happenings when hardware on different linecards was too
> different to aggregate links. But this time it's not only the same hardware,
> it's the selfsame linecard and all four port-groups have oversubscription 
> mode enabled. I also moved the second link to another linecard (also
> WS-X6716-10GE with DFC3C) but with no success. Does anyone have an idea what
> i did wrong?
> Best,
>    Sebastian.

More information about the cisco-nsp mailing list