[c-nsp] Hierarchical FIB on Cisco 7600

[Adam Vitkovsky]

> James Bensley
> Sent: Tuesday, May 03, 2016 1:45 PM
> To: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] Hierarchical FIB on Cisco 7600
>
> On 23 April 2016 at 20:38, Adam Vitkovsky <Adam.Vitkovsky at gamma.co.uk>
> wrote:
> >> Reviving this old thread, is anyone running a hierarchical FIB on a
> >> 7600, how is it working for you? Has it halved your PPS rate for
> >> VPNv4/VPNv6 traffic due to recirculation?
> >>
> > Sorry can't comment on this
>
> I've had some off lists responses and spoken with TAC. For the sake of the
> list archives, H-FIB on a 7600 (Cisco all it "PIC Core") will indeed half the PPS
> rate for VPNv4 traffic, it's basically a no-go on 7600s, they aren't up to it. In
> addition to that, in this day and age people are unlikely to have enough free
> RAM if they are carrying the full BGP table to enable this feature.
>
Thank you very much for posting this back to the list,
Wasn't aware the hierarchical lookup is most likely done via recirculation on 7600 (what a nasty trick) -does it affect only L3VPN lookups or lookups in global routing table as well please?
I assume it does affect PIC Edge as well as Core for L3VPN prefixes.







adam





        Adam Vitkovsky
        IP Engineer

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E:      Adam.Vitkovsky at gamma.co.uk
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