[c-nsp] BGP routes: 207k + 157k = 238k ???...
Tony Li
tli at cisco.com
Fri Jan 25 00:04:35 EST 2008
On Jan 24, 2008, at 7:22 PM, Deepak Jain wrote:
> In your opinion, is there any downside to this behavior
> operationally (other than the time it takes for a unadvertised
> route to present itself in the event the advertised route is
> withdrawn?)?
Other than that, Mrs. Lincoln, how was the play?
;-)
The advantage to that behavior is that it helps reduce the state
involved. If all iBGP speakers advertise all routes, then you end up
with tables the size of (# of routes) * (# of BGP speakers) at every
speaker. While this might not seem like a lot, consider the case of
Tier 1 SPs who have 240k routes (+ internal routes) times 500 or so
BGP speakers.
DRAM is cheap, but it's not free.
Tony
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