[c-nsp] 6500 router hangs (IPV4 routing slows to a crawl) when IPV6 routing is enabled with VRFs.

[Phil Mayers]

On 06/13/2012 11:35 PM, Dale W. Carder wrote:

> Deep down inside, I'm thinking that this cpu busyness as the tcam
> gets reprogrammed with 500k entries all at once might just be
> expected behavior on the sup720.

Presumably the problem isn't the CPU being busy per-se, but the fact 
that, during the very slow FIB loading, the (progressively decreasing) 
absence of TCAM entries is causing traffic to punt to CPU?

I'm kind of a bit puzzled by this; it's not entirely obvious to me why 
enabling the specific sequence of commands would cause a complete "wipe 
& refill" of the FIB, as opposed to an incremental update.