[nsp] BGP4 and high Ping Times

[Gert Doering]

Hi,

On Thu, Jan 30, 2003 at 07:23:09PM +0100, sthaug at nethelp.no wrote:
> > Yes, you get this when the BGP scanner runs which is once per minute, as the
> > 7206 is a single processor this means whilst its churning 250000 routes your
> > packet latency goes up.
> 
> But why should he care? ICMP for one of the router interfaces is not the
> same as ICMP going *through* the router - this may not be affected at all.

It isn't.  ICMP addressed at the router is "processed", while IP/ICMP
*through* the router is handled at IRQ level and just shoved through.

> The per-minute BGP scan gives higher roundtrip times even for platforms
> with hardware-based forwarding (e.g. the 6500).

Those are even worse - the hardware can *forward* packets, but it won't
*reply* to them -> off to the main CPU, and into the scheduler.  "Reply
to this if you feel you have the time".

gert
-- 
Gert Doering
Mobile communications ... right now writing from * Amsterdam *