From: Ryan Morris (ryan@egate.net)
Date: Fri Nov 23 2007 - 14:45:22 ART
Hi Fawaz,
UDLD is a layer 1/2 protocol. You need to configure it directly on the
physical interface (i.e. not right on the Port-channel interface):
int gig0/1
udld port <aggressive>
If one of the ports in your channel becomes unidirectional, it shuts that
port down and takes it out of the port channel. I actually had this
happen to me on a production network... crazy behaviour results because
the switch that thinks both ports are up continues to load balance across
the bad port, causing major problems for applications.
This is documented in the DocCD under the 3550/3560 configuration guide
under "Configuring UDLD".
Regards,
Ryan Morris
CCIE #18953
On Fri, 23 Nov 2007, Fawaz Habeeb wrote:
> Dear all,
>
> I have a question, kindly requesting to solve this problem for me. I have
> been seraching for an answer in cisco website..but no luck....
>
> My question is :
>
>
> Scenario:
>
>
>
> I have two switches (SW1 and SW2) connected to each other by Fast-Ethernet
> port ( i.e SW1 fa 0/23 to SW2 fa 0/23) and (SW1 fa0/24 to SW2 fa 0/24).
>
>
>
> I have configured port-channel between them.
>
>
>
> SW1
>
> Int ra fa 0/23-24
>
> Sw tr enc dot1
>
> Sw mode tr
>
> Channel-group 1 mode on
>
>
>
> SW2
>
> Int ra fa 0/23-24
>
> Sw tr enc dot1
>
> Sw mode tr
>
> Channel-group 1 mode on
>
>
>
>
>
> Question: Configure the port channel for UDLD. When unidirectional link is
> detected, shut down the affected port.
>
>
>
>
> Thanking you,
>
> Regards
> Fawaz
>
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