[c-nsp] BGP memory on a 6500

[Alexandre Snarskii]

On Mon, Oct 02, 2006 at 02:24:54PM -0700, Rick Kunkel wrote:
> Gotta jump back to this for just a sec... sorry to be so pesky... ;)
> 
> OK... Supervisor 2 only has enough TCAM for a little more than about
> 200,000 routes.  Got it.
> 
> And I'm understanding that it's switching things in software after that,
> is that right?  Does that mean that it will switch 200k+ of the routes in
> hardware, and the remaining ones in software?
> 
> Essentially, what I'm trying to figure out is if I *DO* go over that 200k+ 
> routes, how greatly am I gonna suffer?

It depends. 
At least in one case (really old Sup2 with 256M) we got next lines in log: 

XXX  X 18:14:22.495 MSD: %FIB-3-FIBDISABLE: Fatal error, slot/cpu 1/0: no memory
XXX  X 18:14:22.447 MSD: %SYS-SP-2-MALLOCFAIL: Memory allocation of 65536 bytes 
failed from 0x4011AB1C, alignment 16 
Pool: Processor  Free: 57172  Cause: Not enough free memory 
Alternate Pool: None  Free: 0  Cause: No Alternate pool 

-Process= "CEF IPC Background", ipl= 0, pid= 126
-Traceback= 4011F378 40120B94 4011AB24 4089255C 40872BB8 40877BDC 4087FD10 4088E
904 4088813C 40888524 40888804 40889118

XXX  X 18:14:22.491 MSD: %FIB-SP-3-NOMEM: Malloc Failure, disabling DCEF on line
card

and then cisco were reachable only via Loopback address (not even via int Vlan
ones), and only reload helped to enable CEF again. 

Well, I know that 256M RAM is not enough for even one full-view, but we got 
it after leaking only about 10k prefixes on that router... 

YMMV, of course, but I'd highly recommend you to check behaviour in 
lab before this goes to production... 

 
> Thanks,
> 
> Rick
> 
> 
> On Wed, 27 Sep 2006, Francois Corth?sy wrote:
> 
> > Hi Rick,
> > 
> > Might I point to this earlier discution : 
> > https://puck.nether.net/pipermail/cisco-nsp/2006-August/032822.html
> > 
> > Essentially, If you plan on using anything else than a Sup720-3BXL for 
> > Full BGP routing on a 6500 for more than 1 or 2 years you are stuck.
> > 
> > Francois
> > 
> > Rick Kunkel wrote:
> > > Hello all,
> > >
> > > I'm considering a 6500, and am trying to assemble a list of required 
> > > components.  I'm looking at the Sup2 with PSC2 and MSCF2.  You can get the 
> > > MSFC with 512MB of RAM.  Is THIS the RAM that the BGP routing table would 
> > > be used, or is that stored elsewhere?  If elsewhere, then where?
> > >
> > > THanks,
> > >
> > > Rick Kunkel
> > >
> > >
> > > _______________________________________________
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> > > https://puck.nether.net/mailman/listinfo/cisco-nsp
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> > >
> > >
> > >   
> > 
> > 
> 
> 
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