[c-nsp] 7513 T3 Card Question

[Pete Templin]

David Coulson wrote:

> You can look at individual VIP CPU usage too however. For example, a 
> VIP2-50 with a single PA-MC-T3 (running 28 full DS-1 spans) maxes out at 
> 30% and only indicates a 10% average CPU load during business hours. I'd 
> think that the CPU usage on the VIP would be dependent only upon PAs on 
> the card, rather than the rest of the router.

CPU usage on the VIP is related to the ingress packet rate, and the 
features needed to handle those packets.  Once the ACLs are applied, the 
FIB lookup is completed, and the packet is dispatched to the egress 
interface, very little resources are consumed.

VIPs handling your uplinks could "melt" under attack, since the uplinks 
can probably sustain enough PPS to exceed the VIP capabilities.

pt