[c-nsp] dCEF Problem

[David Coulson]

I'm not sure how much memory is required to load 12.4 onto a VIP - I 
only run 12.2S on the 7507s/7513s I manage. That said, you can probably 
pick up 128Mb of DRAM and 8Mb of SRAM for less than $50 to get the card 
up to snuff. Plus, if you're really wanting to run 12.4, you should 
probably get something that isn't that old.

How many routes do you have loaded on that router? A VIP2-50 I'm running 
(1x PA-FE-TX + 1x PA-2T3) has 65Mb free running 12.2S(25)12 with approx 
100k routes on the RSP - It seems pretty happy. I'd look at how much 
memory is available without dCEF and go from there. I've not touched a 
VIP with 32Mb of RAM for a long time (except for when someone configured 
one incorrectly and put 32/8 on it and it didn't even load IOS onto it 
before it crashed).

FYI, there is the handy 'if-con X' command, which will give you access 
to the VIP on slot X. From there you can do show proc, show mem, and 
whatnot. sh ip cef summary is handy:

IPv4 CEF is enabled for distributed and running
VRF Default-IP-Routing-Table:
 95779 prefixes (95779/0 fwd/non-fwd)
 Default network 0.0.0.0/0
 Table id 0, 0 resets
 Database epoch: 7 (95779 entries at this epoch)


Sridhar Ayengar wrote:
> I have a 7505 with RSP2 with a VIP2-50 containing a PA-FE-TX in slot 0, 
> and a PA-4E in slot 1.  If I activate dCEF and reload, I get errors 
> saying things like "Memory allocation of xxxx bytes failed" and "Cause: 
> No memory" and "No alternate pool".  After that, the VIP2-50 looks like 
> it crashes, and everything starts over again.  I was able to get the 
> router back up and running by deactivating dCEF while the VIP2-50 was 
> down, after which everything started running normally.
>
> Now, I am not running BGP or a firewall on this router, or anything else 
> that takes a lot of horsepower.  The only thing I'm running that takes 
> any power at all is a PPPoE connection on one of the ports of the PA-4E. 
>   Why am I running out of memory for dCEF?
>
> Also, I'm sorry I don't have the exact error message, as I was 
> concentrating on getting the router back up.  If it will help, I can 
> schedule some downtime and activate remote syslog.  Just let me know.
>
> My VIP2-50 has 32MB of DRAM and 4MB SRAM.  Does this need to be 
> upgraded?  The RSP2 has 128MB DRAM and is running IOS 12.4(1a).
>
> Thanks.
>
> Peace...  Sridhar
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David

-- 
David J. Coulson
email: david at davidcoulson.net
web: http://www.davidcoulson.net/
phone: (216) 920-3099 / (216) 258-4942