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Cisco 2611 and BGP

Ok, I have my nomex on... I have a customer with a Cisco 2611, 32meg memory, 16mb flash, one T1 W1C, one ADSL W1C.

Customer wants to multi-home using two frame connections (one frame-T1, two dlci, two remote locations) and the dsl as a "backup" to the frame.

Remote routers are all Cisco 7206vxr.

Question I have, is can (and hopefully suggestions on how best) this router support BGP with only a default route from each remote (the two frame end points and the DSL endpoint 7206s). Something like the: ip prefix-list ABC seq 5 permit 0.0.0.0/0 shown in the cisco docs under sample configs for multihoming where only a default route is required (not full or even partial tables)...

Thanks,

Larry Smith lesmith (at) ecsis.net

Reply to
Larry Smith
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Yes, yes, and yes.

Now for the challenges:

  • Load balancing is not automatic between the two DLCI's. You'll need to do some work. Google is your friend, as is the FAQ.

  • The chances of losing one DLCI and not the other is a lot lower than logic would say it should be.

  • The DSL backup will be tricky, but not impossible if you need to NAT to use it.

  • The DSL backup will be impossible if you need to use NAT on both frame and DSL.

  • 26xx IOS 12.3 base IP does NOT support BGP. You will need to downgrade to IOS 12.2 or upgrade to as 12.3 feature set which does include BGP.

  • This does not protect you from a frame link with high BER. But then, nothing does :-(

Good luck and have fun!

Reply to
Vincent C Jones

Larry,

Why not build a VPN with a higher metric route over the DSL line for your backup link. This way either side can initiate the connection and you don't have to deal with the hassles of BGP.

-Richard

Reply to
Richard Graves

Richard,

Yes, that will work for the DSL backup, but what about the two frames (that connect to different cities/routers)?

Larry Smith lesmith (at) ecsis.net

Reply to
Larry Smith

Thanks,

As for challenges, NAT is not requried (or desired) on any; current IOS does support BGP (at least the commands are there) and load balancing is not required. Plan old routing.

EG: DLCI to City A as primary DLCI to City B as secondary DSL as frame "fail-over".

Larry Smith lesmith (at) ecsis.net

Reply to
Larry Smith

Larry,

You want to load balance/fail-over the two PVCs? You could build a PPP multilink group to accomplish this, and its still simplier than using BGP, in my opinion.

-Richard

Reply to
Richard Graves

Richard,

As mentioned earlier in this thread, load balancing is not required. Plan old routing.

EG: DLCI to City A as primary DLCI to City B as secondary DSL as frame "fail-over".

Larry Smith lesmith (at) ecsis.net

Reply to
Larry Smith

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