[c-nsp] 1Gig->10Gig port-channel migration

[Tim Durack]

On Thu, Oct 13, 2011 at 11:24 AM, Phil Mayers <p.mayers at imperial.ac.uk> wrote:
> On 13/10/11 16:03, Tim Durack wrote:
>
>>
>> I had hoped I could add the 10Gig links to the existing port-channel,
>> and remove the 1Gig links.
>
> No can do, as you've doubtless discovered.

Yes, thanks for confirming ;-(

>> Next best idea is to migrate the 1Gig port-channel to Po2, and create
>> a new Po1 with 10Gig links (I would like to maintain Po1 as the pop
>> backbone.)
>
> I would just do this, then let STP choose the higher bandwidth link.
>

Any idea what the STP impact is likely to be? Sub-second? 30s? Wild
STP oscillations that eventually recover 3 days later after disabling
all redundant links? (Our STP is stable, but I still have a healthy
fear of "waking the sleeping giant.")

Essentially I'm trying to figure out how big of a maintenance window
and how many "oh my God, it's full of stars" moments to expect. (I'd
mock it up in the lab, but only have one lab chassis...)

-- 
Tim:>