[nsp] PPS Interface Counters

[Lawrence Wong]

I just tried it out on MRTG and it's plotting the pps
just fine. ^_^

Just another query on pps. How does this counter or
pps in general work with respect to distributed
platforms like the C7500 series with distributed CEF
enabled? I understand that each VIP has it's own
onboard processor that takes care of
forwarding/routing. So what happens if traffic enters
says 1/0/0 and leaves via 1/1/0 (same VIP card) or
enters 1/0/0 and leaves via 2/0/0 (different VIP
card)?

And each VIP also has it's own pps rate so is the max
rate totalled up across all VIP or each has it's own
upper limit?

TIA!

--- Ryan O'Connell <ryan at complicity.co.uk> wrote:
> Lawrence Wong wrote:
> 
> >How about packets which are blocked during DoS/DDoS
> >attacks? Would this break the calculation as well?
> >Since you could see 10,000 pps on one interface
> that
> >doesn't go anywhere but is taken into account when
> >adding things up.
> >  
> >
> 
> Well, Null0 has counters on it so I guess if you're
> routing a [D]DoS to 
> Null0 it'll still be accounted for as long as you
> check there. I've 
> never seen the input/output rate counters on Null0
> ever read anything 
> other than 0, but then I've always been too busy
> during a serious DDoS 
> to look. :-) If you're blocking with ACLs or some
> other method, I guess 
> this would break the calculation.
> 
> >Does the OID which you mention earlier take into
> >account all packets that are forwarded (aka work
> done
> >by router) or is it also limited to normal &
> unicast?
> >  
> >
> 
> I don't know for certain, but I suspect it counts
> every packet that 
> enters the router exactly once regardless of the
> number of times it's 
> subsequently forwarded out of the router. (Zero, one
> or more)
> 
> -- 
>          Ryan O'Connell - CCIE #8174
> 
> I'm not losing my mind, no I'm not changing my
> lines,
> I'm just learning new things with the passage of
> time
> 
> 



	
		
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