From: Mark Lewis (mark@mjlnet.com)
Date: Sat Nov 13 2004 - 19:27:12 GMT-3
The figures quoted are based on the following maximum number of vrf routes
(all vrfs):
3745 - 20,000
3725 - 20,000
3660 - 20,000
3640 - <don't have the figure>
3620 - < " >
3750 metro - 8,000
(the above route limits and the previously mentioned practical vrf limits
are from Cisco - I don't have the 7xxx numbers to hand).
Each VRF consumes: 1 IP control block (33,184 byes), 1 network descriptor
block (ndb) per route (64 bytes), and 1 routing descriptor block (rdb) per
path (144 bytes).
You should budget about 60-70k bytes per vrf (vrf control block, cef, lfib,
idbs [4692 bytes per hardware idb & 2576 bytes per software idb], etc), and
about 800-900 bytes per route (cef, lfib, rib in bgp). It's a very good idea
to provision 256mb on PE boxes, if at all possilbe. And don't forget the
memory consumed by IOS, routing protocols (eg. about 168k per OSPF process +
required ospf database req.s), and any Internet routes.
Also, watch out for cpu utilization - if you are using static routing for
vrfs then you can obviously get away with a greater number of vrfs than if
you are using ebgp/rip/eigrp/ospf.
HTH,
Mark
CCIE#6280 / CCSI#21051 / etc.
Author: http://www.amazon.com/exec/obidos/ASIN/1587051044/
-----Original Message-----
From: Yasser Aly [mailto:yaseraly00@yahoo.com]
Sent: 13 November 2004 21:41
To: Mark Lewis; afahmi@plasa.com
Cc: R&S CCIE List
Subject: RE: MPLS-vrf limitation
Hi Mark,
I would like to know the real world guidelines you mentioned are
calculated on what basis ?
Is it a CPU limitation, routing-table size limitation or what ?
Some VRFs can have as few as 100 routes, where as other VRFs can have much
more.
Also do you have some real world figures for the 7xxx series routers.
Regards,
Yasser
Mark Lewis <mark@mjlnet.com> wrote:
>anybody knows how to know how many VRF can be created on a router ?
Here are some rough real world guidelines for some MPLS edge platforms:
3745 - 15 vrfs
3725 - 15 vrfs
3660 - 15 vrfs
3640 - 5 vrfs
3620 - 5 vrfs
3750 metro - 26 vrfs
>I read from cisco docs its depends on interface Description Block
>(IDB) but I didnt find how to know availability of free IDB, anybody
>can help ?
>
You can use the 'show idb' command.
HTH,
Mark
CCIE#6280 / CCSI#21051 / etc.
Author: http://www.amazon.com/exec/obidos/ASIN/1587051044/
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