Routing Diffrent Vlan to 2 Diffrent ISP's

Unanswered Question
Jul 16th, 2008

Hi Experts,

we have 1841 Router have 3 fasethernet ports and 2 diffrent ISP's are connected to Router using 2 fastethernet port and 1 ethernet port is used to connect LAN using subinterface's

issue is

1)i would like to distribute some Vlan trafic to go ISP-1 that is via Fa0/1

2)i would like to distribute some VLAN trafic to go via ISP-2 that is via fa0/2

can we use static route?but how can i define in router



I have this problem too.
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lee.reade Wed, 07/16/2008 - 23:29


Well you could just configure 2 static routes on the lan router, each one pointing to a different ISP, this will give you two default routes, and allow you to split the load across these.

Another way would be for you to ask the ISP's to send you partial routes and a default, that way they will send you all prefixes that they are responsbible for, ie part of their ISP setup, all of their customers etc. This way your router would use the closest match for routing to a specific ISP's local routes, and use the default for any other routes, not part of either ISP's local network.

ip route

ip route

Where & is the isp inside router address that connects to your router.



kirankumar.chamakura Wed, 07/16/2008 - 23:33

Thats Grate,

what if i want to route to route ISP-1

AND rOUTE to route via ISP-2

lee.reade Thu, 07/17/2008 - 00:42


Meant to add, you would prob want to check out the PBR tracking options available so that if you were sending all traffic from one network down to a certain isp router, then if that isp router went away, failure etc, that this traffic gets rerouted to the other isp router.

You can do this via PBR tracking.




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