HSRP-Hot Standby Router Protocol would be your best bet, BGP might come into play but it require more complications and coorperations from your both upstream providers(ISPs). However with HSRP configured on both routers:
Use the Config below as a guide: FOR ROUTER1 to ISP 1 (Include all DNS, default gateways and specific parameters pointing to ISP1's networt here) int serial 0 ip address n.n.n.n n.n.n.n (ISP1's serial interface IP address) interface Ethernet1 ip address x.x.x.x x.x.x.x (inside network) standby priority 105 standby preempt standby ip x.x.x.x+z (where z can be a +ve or -ve number, just a free IP address) standby track Serial0 FOR ROUTER2 to ISP 2 (Include all DNS, default gateways and specific parameters pointing to ISP2's networt here) interface serial 0 ip address k.k.k.k k.k.k.k (ISP2's serial interface IP address) interface Ethernet1 ip address p.p.p.p p.p.p.p (Inside Network) standby priority 100 standby ip x.x.x.x+z (where z can be a +ve or -ve number, just a free IP address) NOTE: Set your inside server's gateway address to x.x.x.x+z .Router2 above will be the active router thus the router to ISP1.However if ISP one becomes unavailable, its priority will be reduced from 105 making router two to become the active router. Because of the preempt command Router1 resumes its active role whenever it become available again and router2 would then revert back to be the standy router. I guess this might help you, you can check Cisco site for more information. (http://www.cisco.com/warp/public/459/hsrp_bgp.html) Enjoy Godswill Oletu CSS1,CCDP,CCNP. ----- Original Message ----- From: Yassel Omar Izquierdo Souchay To: Sent: Monday, February 25, 2002 7:10 AM Subject: TWO ISP AND ONE FAILURE [7:36371] > Hello i have a frecuent porblem with one of my isp, i have two cisco routers > and each one to different isp. Frequentily i have to change the gateway of > one of my servers, because one isp is failure. > I want to know if with one of BGP, OSPF, RIP, NAT or other protocol i could > do the change automatically to the other active isp. > It happening me right now. And when i have to do that i have to reset one of > my servers.. :S. Is a costs operatrion its a mail server. > So if somebody knows how to resolve between routers with different isp each > one, how to route accross the other good gateway. > > Thnx in advance > Yassl _________________________________________________________ Do You Yahoo!? Get your free @yahoo.com address at http://mail.yahoo.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=36388&t=36371 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
