[c-nsp] Hierarchical FIB on Cisco 7600

[redscorpion69]

I guess any BGP PIC is out of the question on 7600 with flat fib and single
uplink.

Regards


On Sat, Apr 26, 2014 at 12:50 PM, Cydon Satyr <cydonsatyr at gmail.com> wrote:

> I see. But then is there any effect of having repair path installed with
> "bgp additional-paths install" command on platform without Hierarchical
> FIBs or is it purely cosmetic?
>
> Thank you again :)
>
>
> On Sat, Apr 26, 2014 at 8:00 AM, Oliver Boehmer (oboehmer) <
> oboehmer at cisco.com> wrote:
>
> >
> > >Thank you all; so let me just see if I got this right.
> > >
> > >If we're not loadbalancing with IGP (instead there's primary/backup
> > >uplink)
> > >on edge, and not using H.FIB (with cef table output-chain build favor
> > >convergence-speed) and we're running full BGP table on edge routers,
> > >anyone
> > >with experience on how would flat FIB affect convergence without PIC
> Core
> > >on 7600? In other words what would be real life effect of rewriting
> couple
> > >of hundred thousand entries to point to new output interface in terms of
> > >convergence?
> >
> > I don't have a recent performance study, but I saw a 7600 w/ 200k IPv4
> > prefixes taking ~17 seconds to rewrite all prefixes, where hierarchical
> > FIB cut this down to < 1 sec.
> >
> > >
> > >If you don't mind, could you explain part with "VPNv4 requires recirc" ?
> > >I'm not sure what does that mean in relation with PIC Core?
> >
> > it means it'll cut the pps performance in half for vpn traffic with
> H.FIB.
> >
> > >
> > >And if I understand, since we're already installing in CEF 'repair' path
> > >in
> > >PIC Edge scenario, then H.FIB is not really required?
> >
> > It is. We can't leverage the repair path unless we have a hierarchical
> FIB
> > structure.
> >
> >         oli
> >
> >
> > _______________________________________________
> > cisco-nsp mailing list  cisco-nsp at puck.nether.net
> > https://puck.nether.net/mailman/listinfo/cisco-nsp
> > archive at http://puck.nether.net/pipermail/cisco-nsp/
> >
> _______________________________________________
> cisco-nsp mailing list  cisco-nsp at puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-nsp
> archive at http://puck.nether.net/pipermail/cisco-nsp/
>