[j-nsp] Optimizing the FIB on MX

[Dragan Jovicic]

I had a peek at JunOS documentation; regarding "protect core" and newer
unicast/labeled "protection" commands - they seem to do the same thing.
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.




On Fri, Feb 19, 2016 at 2:25 PM, Adam Vitkovsky <Adam.Vitkovsky at gamma.co.uk>
wrote:

> > Dan Peachey
> > Sent: Friday, February 19, 2016 11:07 AM
> >
> > Cisco often call this PIC core (hierarchical FIB). I think the different
> terms
> > used by the different vendors causes some confusion. From what I
> > understand...
> >
> > Cisco:
> >
> > H-FIB = PIC Core
> > Node protection = PIC Edge Node Protection Link protection = PIC Edge
> Link
> > Protection
> >
> > Juniper:
> >
> > H-FIB = Indirect next-hop
> > Node protection = PIC Edge
> > Link protection = Provider edge link protection
> >
> > However I've also seen node protection referred to as PIC core in some
> Cisco
> > documentation, so who knows :)
> >
> Yeah very confusing indeed
> The draft refers to PE-CE link failure as well as the egress node failure
> in the BGP-PIC Edge section.
> And it refers to core link or node failure protection using LFA in BGP-PIC
> Core section.
>
>
> adam
>
>
>
>         Adam Vitkovsky
>         IP Engineer
>
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