[j-nsp] VPLS Multi-homing primary site link failure failover

[Sean Clarke]

Hi Clarke .. what's the config ? Are you using irb interfaces ?
If no irb, and the PE1 is directly connected to CE1, on interface down 
the VPLS primary should switchover.

cheers
Sean


> I have a VPLS multi-homed environment with two MX routers (PE1 and 
> PE2) connected to a single ethernet switch (CE1).  I have PE1 
> configured with site-preference as "primary" and PE2 as "backup".   
> The interfaces going to CE1 are the only interfaces configured in the 
> multi-homed site on each router.
>
> I am using VPLS with LDP for the label switched paths and BGP for the 
> L2 signaling.  This is with Junos 9.6.  If I manually change the site 
> preference between PE1 and PE2, the correct site is elected as expected.
>
> However, if I physically disconnect the interface between PE1 and CE1, 
> I would expect that PE1 would realize that there are no more active 
> interfaces left on the site and then failover to PE2 for it to become 
> the new primary.
>
> Unfortunately, this isn't happening.  From the perspective of PE1, the 
> VPLS site on PE2 is shown as "RN", remote site not designated.   From 
> the perspective of PE2, the site is shown as "LN", local site not 
> designated. So, PE1 still thinks it is in charge.
>
> Is this a configuration error on my part, or is this FAD?   Is there 
> some sort of workaround that I can implement to force a new "primary" 
> site election between PE1 and PE2 in the event of a link failure at PE1?
>
> Clarke Morledge
> College of William and Mary
> Information Technology - Network Engineering
> Jones Hall (Room 18)
> Williamsburg VA 23187
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