I'm consdiering using Policy routing by source address to do load balancing across 2 routers with an ISP link each. (All traffic goes to router A first) If a packet goes to Router A and policy routed to Router B, what happens if 1. Router B is down but Router A's interface to router B is still up. 2. The packet gets to Router B but the ISP link on another interface of router B is down i.e. Router B can't route the packet ?
If routerB is up but its link to ISP is down, there is no way for routerA to learn this and that route-map can prevent it, unless there is HSRP configured on routerB and routerA's next-hop is set to HSRP address. And in HSRP you configure tracking of your ISP serial link and if it is down, it will also bring down the link to routerA so that routerA knows that the uplink is down.
Alternatively, you can also set 2 next-hop's in your policy routing, if one is not reachable, down, it will use the 2nd next-hop address.
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.