[c-nsp] VPLS and BPDUs tunneling

[Enno Rey]

Hi,

>  will/may grow severely and there will be problem with network
>  stability. Or maybe there are some other reasons for considering
>  BPDUs tunneling harmful ?

what about "unexpected network behaviour"? ;-)
Tunneling STP BPDUs means there will only one STP root (per VLAN in most cases) in your VPLS structure (be a "full one", be one part of a hierarchical one).
Depending on your topology this might induce (at a first glance) "strange frame forwarding paths", including "local site traffic" going through a "remote site STP root".

Thinking of other types of PDUs (like VTP) you may even encounter far worse things like a remote site's VTP server (with high rev number) overwriting remote sites' ones.

For some discussion of this stuff see
http://www.ernw.de/content/e7/e181/e972/erey_security_ethernet_services_ger.pdf

thanks,

Enno






> 
>  Anyway maybe some of you have expirience with BPDUs tunneling
>  via VPLS ? Can your share your impressions about network 
>  stability then ?
> 
>  Actually the main question for me now sounds like "can BPDUs 
>  tunneling impcat network stability and is it depends on network
>  size (number of POPs) ?". Your comments will be very much appreciated :)
> 
>  Thanks in advance.
> 
> -- 
> Andrey Elperin
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Enno Rey

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