[c-nsp] spanning tree question (again)

[Arnold Nipper]

On 20.07.2005 22:39 Andris Zarins wrote

> I'd say that by default l2-protocol-tunneling is turned ON for SPT, CDP
> and VTP, so making QinQ practically transparent ;)
> 

This is at least not true for CatOS. You have to configure this 
explicitely. Have a look at the URL I've provided.




Arnold

> AZ
> 
> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Arnold Nipper
> Sent: Wednesday, July 20, 2005 12:50 PM
> To: Alexander Koch
> Cc: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] spanning tree question (again)
> 
> On 20.07.2005 11:29 Alexander Koch wrote
> 
>> Imagine two switches that are (normally) independent of each
>> others running MST, now we do a l2circuit between two routers'
>> GE trunks to the switches. If I do QinQ here does it have to
>> be MST what my customer does, and will I be transporting their
>> BPDUs normally? Customer is doing PVST.
>> 
> 
> QinQ usually is *not* l2 transparent. If you want BPDUs to be 
> transmitted you have to set up l2 protocol tunneling.
> 
> For CatOS have a look at 
> http://www.cisco.com/univercd/cc/td/doc/product/lan/cat6000/sw_8_3/confg
> _gd/dot1qtnl.htm
> 
> 
> 
> 
> 
> Arnold


-- 
Arnold Nipper / nIPper consulting, Sandhausen, Germany
email: arnold at nipper.de       phone: +49 6224 9259 299
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