[c-nsp] "show platform hardware capacity" shows sup720-3b FIB tableat 98%

[brad dreisbach]

On Fri, Jul 21, 2006 at 09:27:22AM -0700, Peter Kranz wrote:
> I've been told that the 256k route limit on the 3b was bogus, would be
> interested in any feedback on that, since if it's a real limit it makes the
> 3b a no go for anyone getting full routes now. 

this can be changed on the 3b by issueing the following command, and rebooting
(note, the box will reboot 2 times before this change will take effect):

mls cef maximum-routes ip <num of 1k entries>

-b

> 
> Peter Kranz
> Founder/CEO - Unwired Ltd
> www.UnwiredLtd.com
> Desk: 510-868-1614 x100
> Mobile: 510-207-0000
> Fax: 510-217-6031
> pkranz at unwiredltd.com 
> 
> 
> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Darrell Root
> Sent: Thursday, July 20, 2006 10:00 PM
> To: cisco-nsp at puck.nether.net
> Subject: [c-nsp] "show platform hardware capacity" shows sup720-3b FIB
> tableat 98%
> 
> 
> Apologies if this is a rerun.  I tried to search for dups.  I figured a
> warning was timely.
> 
> There's a cool new command in 12.2(18)SXF: "show platform hardware capacity"
> 
> It shows the capacity of all resources on the box.  FIB tables.   
> TCAM.  Flash.  Tons of
> stuff you never heard of.
> 
> Until we upgraded to a sup720-3bxl (very very recently), our sup720-3b with
> full internet routes showed the following:
> 
> L3 Forwarding Resources
>               FIB TCAM usage:                     Total         
> Used       %Used
>                    72 bits (IPv4, MPLS, EoM)     196608       
> 192900         98%
>                   144 bits (IP mcast, IPv6)       32768            
> 5          1%
> 
>                       detail:      Protocol                     
> Used       %Used
>                                    IPv4                       
> 192900         98%
>                                    MPLS                            
> 0          0%
>                                    EoM                             
> 0          0%
> 
>                                    IPv6                            
> 2          1%
>                                    IPv4 mcast                      
> 3          1%
>                                    IPv6 mcast                      
> 0          0%
> 
> 
> So while the sup720-3b is advertised as being able to handle 256k routes, by
> default it allocates 64k 32-bit entries to IPv6 and multicast, giving a
> default IPv4 capacity of 196608 entries.  The Internet route table is almost
> there.  At the current rate of growth we've got about a month.
> 
> I would assume that if we hit 100% that bad things would happen.  The cat6k
> makes a pretty good 7200 when it forwards in software ;-)
> 
> A previous message on this list from Andrew Fort indicates:
> 
> > box#show mls cef maximum-routes
> > FIB TCAM maximum routes :
> > =======================
> > Current :-
> > -------
> >  IPv4 + MPLS         - 192k (default)
> >  IPv6 + IP Multicast - 32k (default)
> >
> > I know you can re-carve this ('mls cef maximum-routes ...'), which 
> > obviously requires a reboot.
> 
> 
> On a sup2 in hybrid mode "show polaris fibmgr usage" shows:
> 
> 
> Total FIB entries:        262144
> Allocated FIB entries:    193003
> Free FIB entries:          69141
> FIB entries used for IP ucast:  193002
> FIB entries used for IPX     :       1
> FIB entries used for IP mcast:       0
> 
> So I think my sup2 hybrids are ok.
> 
> Question: Are my sup2 native-ios boxes ok?  I can't figure out how to verify
> my free FIB capacity on my 12.1E boxes.  Anyone know the magic command for
> that?
> 
> Darrell Root
> darrellroot at mac.com
> 
> 
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