[c-nsp] *** GMX Spamverdacht *** Advice - c7200VXR with 2 bgp tables and peering fabric

[Garry]

On 06.06.2013 00:49, Eric A Louie wrote:
> I have a c7204VXR NPE-G1 1GB RAM 6 GigE (3 on the NP, 1 on the I/O, and 2 PA-GE).  Passing about 150Gbps of traffic.  It's taking a full eBGP feed (470k routes), and connected to a peering fabric (30k routes so far).
>
> When I turned up the peering fabric, I spiked the cpu for about 5 minutes and it settled down nicely.  CPU utilization now is 25% max on core1, 20% on core2.
>
> I need to enable iBGP on it.  It's peer will be another c7204 (NPE-G1, 1GB, 3 GigE) with a full BGP feed (450k routes).  I have about 250Mbps backhaul link between the routers.  
In regular day-to-day operation, it will most likely run nicely, with
the expectable and documented bandwidth limits ... using it a an
Internet exchange router can push the CPU performance a bit if you'd
have lots of peering sessions, as well as when building the initial
tables ... do keep in mind that not the bandwidth may be a limiting
factor, but the number of packets ... being hit with even a small to
moderate UDP flood will quickly bring 7200 routers down ...

-garry