Re: Q-in-Q BPDU

I can mock this up in my lab and see if I have seen it. I've seen something
similar in the past I believe.

On Wed, Jan 27, 2010 at 3:31 PM, Ben Montana <benmontana20_at_gmail.com> wrote:

> Mocked up in a lab from a real-world scenario that I've seen.
>
>
> On Wed, Jan 27, 2010 at 2:50 PM, Joseph L. Brunner <
> joe_at_affirmedsystems.com> wrote:
>
>> Is this a lab or a real-world design?
>>
>> -----Original Message-----
>> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
>> Richard Ginto
>> Sent: Wednesday, January 27, 2010 1:25 PM
>> To: ccielab_at_groupstudy.com
>> Subject: Q-in-Q BPDU
>>
>> I'm running a Q-in-Q tunnel using 3750s and "customer" switches at the
>> edge
>> like so:
>>
>> customer switch #1 <--Dot1Q access--> SW1 <--trunk--> SW2 <--trunk--> SW3
>> <--Dot1Q access--> customer switch #2
>>
>> Using shared-round-robin I have the carrier switches setup to place the
>> customer's EF traffic into the priority queue and I police that traffic
>> inbound to 5Mbps. I then have the remaining 3 queues weighted so as AF31
>> goes to a queue with a weighting of 60, AF21 goes into a queue with a
>> weighting of 40, and the last queue is a weight of 1 which is for BE
>> traffic.
>>
>> The problem I see is when I saturate this link during testing with 5Mbps
>> of
>> EF and 100+ Mbps of AF31 and AF21 traffic, I drop BPDUs between my
>> customer
>> switches and spanning-tree re-converges.
>>
>> Any suggestions on how I can get my BPDUs prioritized through this so I
>> don't drop them during congestion? Though I am doing everything on layer 3
>> markings, I re-mapped CoS so that Cos 5 is placed into the priority queue
>> and Cos 6 & 7 are placed into the queue with a weighting of 60.
>>
>> Thanks all
>>
>>
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Received on Wed Jan 27 2010 - 15:33:08 ART