[c-nsp] Dual-Homed VPLS

[Peter Krupl]

Hi,

I have looked at this issue too, but your solution has one major flaw...

Q:
What would happen if the VPLS circuits go down in the core network,
And then came back up ?
A: You have a loop, until spanning tree notices....

Flexlink seems more usable....


Med venlig hilsen/Kind regards
Peter Åris Krüpl
Netværksspecialist

-----Oprindelig meddelelse-----
Fra: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] På vegne af alaerte.vidali at nsn.com
Sendt: 25. juli 2007 17:33
Til: helmwork at ruraltel.net
Cc: cisco-nsp at puck.nether.net
Emne: Re: [c-nsp] Dual-Homed VPLS

Hi Eric,

Exactly.

As PE would forward Spanning tree BPDUs transparently, I am considering
STP is also an option to block a link.
For example:


CE1-A_(fa-1/1)---------------  PE1=======PE2---------CE2-A (STP ROOT)   
    |                           \         /
    (fa-1/2)                     \       / 
    |_________________________    \     /
                                   PE3


Considering CE2-A is STP root, CE1-A would receive BPDU from both
interfaces, would choose fa1/1 as RP and would block fa1/2.
What do you think?


I hope we receive more feedback.


Best Regards,
Alaerte

 

-----Original Message-----
From: ext Eric Helm [mailto:helmwork at ruraltel.net] 
Sent: Wednesday, July 25, 2007 12:15 PM
To: Vidali Alaerte (NSN - BR/Rio de Janeiro)
Subject: Re: [c-nsp] Dual-Homed VPLS

Alaerte...
Are you talking about dual-homed VPLS endpoints? If so, I'd be curious
to hear what suggestions you receive for this topic. When I looked into
doing this, it seemed that using Flex-Links was the only viable
solution.

Regards,

/Eric

alaerte.vidali at nsn.com wrote:
>  Hi,
> 
> Do you indicate any reference for this topic?
> 
> I tried some books like "MPLS Configuration on Cisco IOS Software"
> (pretty good book) by Lancy and Umesh, but it only touch the subject.
> 
> Tks,
> Alaerte
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