Cisco 7600 PFC3B(XL) and IPv6 packets with fragmentation header
Nick Hilliard
nick at foobar.org
Fri Sep 30 16:38:09 UTC 2011
On 30/09/2011 17:30, Christopher Morrow wrote:
> traceroute is really an example of 'packet expired, send
> unreachable'... that, today is basically:
> o grab 64bytes of header (or something similar)
> o shove that in a payload
> o use the src as the dst
> o stick my src on
> o set icmp
> o crc and fire
>
> there's not really any need to do this in the slow path, is there?
there are unconfirmed rumours that icmp ping and traceroute are handled by
hardware on the asr1k. I don't know if they are true. But you're right -
it would be good to support this without resorting to hammering the routing
engine. I don't really like the idea of punters running traceroutes
reducing my bgp convergence time.
Nick
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