[j-nsp] Optimizing the FIB on MX

[Adam Vitkovsky]

> Dragan Jovicic [mailto:draganj84 at gmail.com]
> Sent: Saturday, February 20, 2016 1:28 PM
>
> I had a peek at JunOS documentation; regarding "protect core" and newer
> unicast/labeled "protection" commands - they seem to do the same thing.
I think the "protection" (for L3VPN) is actually older than the "protect core"

> Both methods rely on having additional backup route(s) in table and being
> installed into FIB, albeit with greater weight.
> I see one issue with convergence in particular when using a "default" vrf-
> table-label.
> In case of PE1-CE1 link failure in L3VPN, PE1 must reroute packets over to
> PE2, as all other routers still wait for BGP control plane convergence (as
> opposed to nexthop address tracking in case of a node failure).
> Because PE2 takes a peek at IP packet due to vrf-table-label, it still might see
> best route over at the prefered PE1 site, hence a possible transient loop.
>
Yes you are right, so in order for the failover to work you should decrease eBGP protocol preference on PE2.

adam






















        Adam Vitkovsky
        IP Engineer

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