[c-nsp] Nexus OTV Question

[Martin Clifton]

This problem occurred with the 7K NX-OS 5.1.1a. Upgrading to 5.1.2
resolved the problem.

Regards, Martin

---------------------------------
Martin Clifton
ITS - Networks and Computing
Victoria University
Melbourne, Australia

Phone: 03 9919 4579
---------------------------------





On 28/02/11 10:16 AM, "Martin Clifton" <Martin.Clifton at vu.edu.au> wrote:

>Hello all,
>
>We have a pair of Nexus 7Ks at each of our two datacentres, separated by
>about 10K.   There is a 40G L3 connection between the cores at each site
>and we run OTV over this core to provide L2 connectivity betweens the
>DCs.  As well as setting up new vlans on the Nexus kit (5Ks and 2Ks) we
>are also using the OTV connection to transport vlans from our legacy
>datacentre which is based on Cat6509s and 3750s.
>
>I have a concern about the table that is displayed when you enter the
>command "sh otv route".   This table shows entries for "site" (ie local)
>and "overlay" (ie other DC)  mac addresses.    The issue is with the
>"Uptime" data.  For the overlay addresses this will randomly reset to
>zero and all addresses will reset to zero at the one time.   The
>frequency of this reset seems to be a function of the number of vlans ie
>the more vlans I add to the overlay, the more often the value resets.
>With 100 or more vlans the value may build up to a minute or two but will
>often only get to a few seconds before resetting.
>
>This doesn't appear to impact the functionality of OTV.   But does it
>indicate I have a problem ?   What is it that causes the reset and why
>are all the (overlay) mac addresses reset at the same time ?    The
>symptoms occur whether or not "otv suppress-arp-nd" is enabled or not.
>
>Regards, Martin
>
>---------------------------------
>Martin Clifton
>ITS - Networks and Computing
>Victoria University
>Melbourne, Australia
>
>Phone: 03 9919 4579
>---------------------------------
>
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