From: Scott Morris (smorris@ipexpert.com)
Date: Mon Dec 03 2007 - 09:50:56 ART
This is also available in EIGRP.
www.cisco.com/univercd/cc/td/doc/product/software/ios124/124cg/hirp_c/ch07/h
_epls.pdf
One other thing to keep in mind is that when you are running multiple
routing protocols, you take up memory for each IGP's RIB (database) PLUS the
aggregated routing table information, so you have multiple times the amount
of memory for routing updates.
If you dig around lots, you can probably figure out exactly how much memory
that routes take within each protocols' RIB and the routing table, but if
you have to spend that much time on calculating, it would be easier to
either purchase more memory for your router or be more careful on the level
of redistribution you are doing! :)
Just my thoughts...
Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, JNCIE-M
#153, JNCIS-ER, CISSP, et al.
CCSI/JNCI-M/JNCI-ER
VP - Technical Training - IPexpert, Inc.
IPexpert Sr. Technical Instructor
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-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Tarun Pahuja
Sent: Monday, December 03, 2007 4:31 AM
To: ccie ccie
Cc: Cisco certification
Subject: Re: Route Carring Capacity of IGP/EGP ?
Mike,
I doubt if their is any chart that has the exact numbers. The
number of routes in a routing table that an IGP can support is not solely a
property of IGP. Router horse power and memory play a role as well. IGP's
were not designed to carry 100,000 routes like BGP. Majority of the times
the router goes into ICU because of excessive flooding caused by IGP and or
excessive CPU utilization caused by SPF process.
However, Cisco gives you the power to control the number of routes you want
to accept in your routing table when redistributing from BGP into IGP to
protect the router from going to ICU ;-)
http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124cg/hirp_c
/ch15/hfsoredi.htm#wp1040548
http://www.cisco.com/warp/public/459/bgp-maximum-prefix.html
HTH,
Tarun
On 12/3/07, ccie ccie <cciefun@gmail.com> wrote:
>
> Hi,
>
> Do any one having good comparision or chart which shows how many
> routes the IGP & EGP routing protocol ( IS-IS not CCIE topic but must
> to know for
> me) hapily carries, before they go to ICU (Intensive Care Unit -:)
>
> If this depend on router memory then why router crashes when
> accidenty we redistribute BGP to IGP.
>
> Regards,
> Mike
>
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