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Our peer there is also doing similar memory usage..roughly 117 MB for
that many peers. The question I counter with, is PFE memory
requirements. It appears that the pfe uses 8 MB of super high
quality RAM to record next-hops for the IP2 ASIC (assumption on my
part). From show pfe route summary, it appears a router is using
5.8 of this to run ~100k routes. Now I don't know how this is going
to scale in relation to the number of routes, but if you just use a
simple one to one relationship the router will top out at around 140k
routes. This number is based on roughly 59 bits per route in
memory... again, entirely guesstimates.
Obviously the rest of the pfe subsystem has 64 MB of ram...but I
don't know how this applies..
I'm not trying to be negative here, just want to see if anyone else
has thought of this?
Thanks,
Tony
- -----Original Message-----
From: nicholas harteau [mailto:nrh@ikami.com]
Sent: Thursday, February 15, 2001 11:49 PM
To: Josh Richards
Cc: juniper-nsp@puck.nether.net
Subject: Re: [j-nsp] BGP memory consumption
Your juniper will have RIBs for each peer/protocol pair. In my
experience the memory use scales linearly all else being equal.
Also,
I'd be hard-pressed to find a scenario outside of a lab where you
will
use more than the 768M of ram that the junipers support these days.
My
AADS router is using 128M with 55 peers and mbgp running as well as
bgp.
Josh Richards wrote:
> How does Juniper's BGP memory consumption compare to, say, a Cisco?
>
>
> While the exact answer obviously varies depending on the peering
> sessions, what magnitude of memory consumption can I expect to be
> necessary for the first full transit view (~100,000 prefixes) and
> each successive additional transit view of similar size?
>
> Is the memory consumption in such a way that I can assume that a
> peer with, say, only 10,000 prefixes is going to consume 10% of
> the amount of memory as the 100,000 prefix peer?
>
> Damn, I can't wait to get a few of these things in the lab...
>
> -jr
>
> ----
> Josh Richards [JTR38/JR539-ARIN]
> <jrichard@geekresearch.com/cubicle.net/fix.net/freedom.gen.ca.us>
> Geek Research LLC - <URL:http://www.geekresearch.com/>
> IP Network Engineering and Consulting
>
- --
nicholas harteau
nrh@ikami.com
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