02-12-2009 09:45 PM 03-06-2019 04:01 AM 更新
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
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02-13-2009 09:14 AM
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
02-12-2009 09:58 PM
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
02-12-2009 11:58 PM
Hi Giuseppe
Thanx for your reply do you have any supporting documents mentioning the same if not directly from Cisco
02-13-2009 09:14 AM
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
02-13-2009 08:46 PM
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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