BGP multihoming / router selection

Answered Question
Mar 26th, 2007

I need to spec out two routers for a BGP multihoming setup consisting of two DS-3 connections from separate ISPs for redundancy. I'm currently planning on using one router for each of the eBGP DS-3 connections and using iBGP internally between them.

We currently are using a Cisco 2821 for a single DS-3 connection. I need to know if the 2821 will still be capable when the second connection is added and iBGP is implemented? Would the 3800 series be a better fit?

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Correct Answer by Danilo Dy about 9 years 6 months ago

3845 with 512MB memory is recommended, it can scale up to 1GB memory and multiple network modules. Beside, only the following model support up to two DS3 module NM-1A-T3; 3660, 3745, 3845

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Overall Rating: 4.5 (3 ratings)
walleyewiz Mon, 03/26/2007 - 14:25

3800 would be a much better fit. Personally, I would never put more than 4xT-1s on a 2821. Will you be getting the full BGP table from the providers?

swanson_s Mon, 03/26/2007 - 14:50

We currently are receiving the full table. However, even if I reduce the size of the routing table; I still want to make sure that routers will be scalable enough for growth and traffic spikes.


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