RE: Max routes in VRF?

 Thanks for the valuable feedback.

As below, it's a sup720-3bxl (Show modules)

 5 2 Supervisor Engine 720 (Active) WS-SUP720-3BXL

And this is the max routes,
Host# show mls cef maximum-routes
FIB TCAM maximum routes :
=======================
Current :-
-------
 IPv4 + MPLS - 512k (default)
 IPv6 + IP Multicast - 256k (default)

Also, each line card has "L3 Forwarding Resources" that can be used:
L3 Forwarding Resources
 Module FIB TCAM usage: Total Used
%Used
   4 72 bits (IPv4, MPLS, EoM) 1048576 7625
1%
                        144 bits (IP mcast, IPv6) 7755 135
2%

                     detail: Protocol Used
%Used
                                  IPv4 3
1%
                                  MPLS 7622
1%
                                  EoM 0
0%

                                  IPv6 5
1%
                                  IPv4 mcast 130
2%
                                  IPv6 mcast 0
0%

            Adjacency usage: Total Used
%Used
                                               1048576 7755
1%

Some follow up question:
1. has anyone imported the global routing table (GRT) into a VRF without any
problems?
2. having GRT routes in IPv4 or VPNv4 VRF has the same TCAM usage?
3. I assume that all PE devices that import the vrf routes need enough FIB
TCAM for MPLS.
4. same with each line card should have enough FIB TCAM available.
5. with "mls cef maximum-routes" , if you increase the mpls allocation it
would decrease ip automatically ?
6. how does mls cef maximum-routes relate to module FIB TCAM usage?
7. what issues would you foresee if I have a transit AS with internet VRF
with all global routes?

Regards,
J

-----Original Message-----
From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of Alex
H. Ryu
Sent: 02 July 2009 11:12 AM
To: Jacques Allison
Cc: ccielab_at_groupstudy.com
Subject: Re: Max routes in VRF?

If you are talking about SUP720-3BXL, probably not.

You can check current TCAM usage using following command.

sh platform hardware capacity forwarding

Also, you can check maximum values.

show mls cef maximum-routes

If you want to change TCAM partition, use following command from
configuration mode.

(config)#mls cef maximum-routes ?
ip number of ip routes
ip-multicast number of multicast routes
ipv6 number of ipv6 routes
mpls number of MPLS labels

(config)#mls cef maximum-routes ip ?
<1-1007> number of 1K entries

(config)#mls cef maximum-routes ip-multicast ?
<1-503> number of 1K entries

(config)#mls cef maximum-routes ipv6 ?
<1-503> number of 1K entries

(config)#mls cef maximum-routes mpls ?
<1-1007> number of 1K entries

Since global full BGP table is too large - over 280k nowadays -, if you
want to keep it in VRF, single instance will be 280k or so.
That means that if you wants to keep 3 VRFs with full table, it will be
280k * 3 , which is 880k entries.
It is beyond the limit.

Alex

Jacques Allison wrote:
> Would it be possible to run eBGP to multiple upstream ISP from with VRF
> address-family and get all global Internet routes? I would like to know
the
> maximum limits of routes within a VRF. I know it would depend on hardware
-
> let say it's a SUP720BXL with specs of 1 million routes. would this also
fit
> into VRF?
>
> Thanks
> J
>
>
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Received on Fri Jul 03 2009 - 08:21:23 ART