07-14-2002 07:47 PM - edited 03-01-2019 11:52 PM
We have two connections to our ISP - Primary : 2620 with G.703 card to E1 service, and Secondary : 1720 with ISDN BRI (128 k). Both routers perform NAT (private IP inside / public IP outside), and our ISP provides BGP route failover for the block of public IP addresses assigned to our account (between E1 and ISDN services).
How can we setup failover to the ISDN service in event of the E1 service failing ? Do we have to move the ISDN service to a new BRI interface on the 2620, or can we still provide failover using BOTH routers ?
07-15-2002 02:21 AM
HI,
it is for sure possible to usel both routers. The best way to do so, is to use HSRP on both
routers. in case that the E1 goes down the HSRP process can increase the HSRP priority
on the cisco 2620 and the cisco 1720 will become the activ route. For HSRP configuring
check on CCO: http://www.cisco.com/warp/public/619/hsrpguidetoc.html
There are for sure more possibilities available (e.g. floating static routing)
regards Ulrich Marzoli
07-15-2002 03:30 AM
How does HSRP affect the routers if they are running NAT - both dynamic and static translations, and CBAC ?? I guess the NAT configuration must be the same on each router, but I am not sure about CBAC ??
07-15-2002 04:52 AM
Hi,
I'm also not quite sure about CBAC but I guess both must be the same. For sure you will lose
the current connectionsin case of a failover because there will be no statefull failover with
HSRP.
Maybe you can use the "ip redundancy" feature to configure statefull failover. It seems at least
be possible: http://www.cisco.com/warp/public/619/hsrpguide4.shtml
but I was never used to use it.
regards Ulrich Marzoli
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide