Cisco 7600 PFC3B(XL) and IPv6 packets with fragmentation header

Christopher Morrow morrowc.lists at gmail.com
Fri Sep 30 11:30:16 CDT 2011


On Fri, Sep 30, 2011 at 11:24 AM, Nick Hilliard <nick at foobar.org> wrote:
> On 30/09/2011 15:45, Christopher Morrow wrote:
>> traceroute could certainly be handled in the fastpath.
>
> which traceroute?  icmp?  udp?  tcp?  Traceroute is not a single protocol.
>

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?
-chris



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