BGP for remote Disaster Recovery Site

Unanswered Question

We currently have a core site COL and a Disaster Recovery Site called OP. We are currently running eBGP with 2 ISPs from our Core COL site. I am looking for suggestions to extend this to the DR site in case we loose our Core COL site connection or gear. It was suggested to do iGBP inside. The DR OP site has a stand alone internet connection. We are connected internal to a ATM cloud using EIGRP. I have a visio but no option to attach it?????

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gesadmin1 Wed, 03/11/2009 - 15:39
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If you lose your main Data Center, what are you hoping BGP will do for you??

Giuseppe Larosa Thu, 03/12/2009 - 01:29
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Hello Alonzo,


>> We are connected internal to a ATM cloud using EIGRP


so when the main site fails is possible to reach via EIGRP the DR site ?


if so the DR site can still use the two main connections to internet.


if when main site is down EIGRP domain is partitioned and DR site cannot be reached internally I don't know if BGP can help.


However, the best way to use the third internet connection of the DR site is probably the use of BGP conditional advertising:

the DR site should start to advertise the server farm's public ip addresses only when the same advertisement is stopped on main site.

This is to avoid that someone on the internet can try to access DR site also when the main site is alive.


for this to work the BGP router of DR site needs iBGP sessions to the other two via the EIGRP /ATM cloud to be able to detect the state of BGP advertisements from main site


see


http://www.cisco.com/en/US/tech/tk365/technologies_configuration_example09186a0080094309.shtml


Hope to help

Giuseppe


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