[172290] in North American Network Operators' Group
Re: Getting pretty close to default IPv4 route maximum for 6500/7600
daemon@ATHENA.MIT.EDU (Saku Ytti)
Wed Jun 11 02:28:20 2014
X-Original-To: nanog@nanog.org
Date: Wed, 11 Jun 2014 09:28:07 +0300
From: Saku Ytti <saku@ytti.fi>
To: nanog@nanog.org
In-Reply-To: <539742E4.70108@ispn.net>
Errors-To: nanog-bounces@nanog.org
On (2014-06-10 12:39 -0500), Blake Hudson wrote:
> Please correct me if I'm wrong, but if the BGP table contains ~500k
> prefixes, which are then summarized into ~300k routes (RIB), and the FIB
> contains only the "best path" entries from the RIB, wouldn't the FIB be at
> or below 300k?
There is nothing to summarize away from global BGP table, if you have number
showing less, it's probably counter bug or misinterpretation.
Global BGP table, single BGP feed, will take same amount of RIB and FIB.
You can see your FIB use in 'show plat hard capa pfc':
#show platform hardware capacity pfc
Module FIB TCAM usage: Total Used %Used
2 72 bits (IPv4, MPLS, EoM) 884736 712819 81%
144 bits (IP mcast, IPv6) 81920 19235 23%
You're probably bit better off than I am :)
--
++ytti
