Cisco 2800 Internet routing

Answered Question
Feb 12th, 2009
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Hi,


I have a very typical issue


I want to undersdtand if a Cisco 2821 with 1 Gb DRAM can absorb the whole Internet routing table ,though i understand it wud'nt be an optimum solution and any supporting documents if available

Correct Answer by Giuseppe Larosa about 8 years 4 months ago

Hello Sudhir,

I haven't a link for this.


Probably an official Cisco answer wouldn't recommend to use a C2821 for handling a full BGP table.

If I remember correctly someone has reported to doing this here in the forums.


The only doubts are about the cpu average usage caused by the BGP process: memory will be enough.

Some tuning of BGP scanner frequency can be needed in order to reduce CPU usage


And of course only if you are receiving a single BGP full internet table and no more.


Hope to help

Giuseppe


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Giuseppe Larosa Thu, 02/12/2009 - 21:58
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Hello Sudhir,

yes with 1GB RAM the c2821 can host a full BGP table of 270,000 routes and it is able to create a CEF table for all the prefixes.



What you cannot have is capability to forward traffic at GE speeds (full rate)


Hope to help

Giuseppe


Sudhir Menon Thu, 02/12/2009 - 23:58
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Hi Giuseppe


Thanx for your reply do you have any supporting documents mentioning the same if not directly from Cisco

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Giuseppe Larosa Fri, 02/13/2009 - 09:14
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Hello Sudhir,

I haven't a link for this.


Probably an official Cisco answer wouldn't recommend to use a C2821 for handling a full BGP table.

If I remember correctly someone has reported to doing this here in the forums.


The only doubts are about the cpu average usage caused by the BGP process: memory will be enough.

Some tuning of BGP scanner frequency can be needed in order to reduce CPU usage


And of course only if you are receiving a single BGP full internet table and no more.


Hope to help

Giuseppe


Sudhir Menon Fri, 02/13/2009 - 20:46
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This has centianly helped me a lot thank you very much Giuseppe ,I was just hoping to find a document as i had a customer call on this

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