Configure 2 lease line on Same router 2811

10 pts.
Tags:
Cisco
Cisco 2811
Leased line
Network connectivity
Router configuration
Routers
Hi All, Currently we are having 1 lease line in our office and soon we are going to have another lease line as backup from other service provider,now the thing is if the provider of the lease line is same then it will be very easy for mr to configure it becoz of same publice ip..but now it becomes diffcult for me two configure it.......Pls help me out. If you need more information about the issues pls let me know. Thanks in advance

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So if I understand you correctly, you have two different leased lines from two different providers with two different networks connected to the same router? If that is the case, there are a few way to accomplish this. First, you create two default routes, with the secondary being weighted. So for example, if primary leased line in the network 1.1.1.0/30 and your interface is 1.1.1.2 and the ISP is 1.1.1.1, your default route will be 0.0.0.0 0.0.0.0 1.1.1.1, and on the secondary, the network was 2.2.2.0/30 with your inteface as 2.2.2.2 and the ISP as 2.2.2.1, you would have another default roue that is weighted 0.0.0.0 0.0.0.0 2.2.2.1 5. The 5 assigns a metric of 5 to the route, where normal static routes have a metric of 0, so if there are two of the same static routes configred on the router, only the static route with the metric of 0 will be in the routing table. If physical inteface that is assocaited with the next-hop of the default route goes down, then the default route is removed from the routing table and the weighed default route, which is pointing to the secondary ISP, is now installed into the routing table. The only downside to this is that a failure is only when that interface between the ISP goes down. If there is a backend problem at the ISP and you leased lines is still up, the primary default-route will stay in the table and not failover.

A second method, which I will not discuss in detail unless you would like more information, is to use IP SLA’s. IP SLA’s can track a downstream IP address by using ICMP and then remove a route and place another into the routing table, if it misses a series of pings.

Hope this helps

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  • patel89
    on the same router (Cisco 2811) can we able to configure two different networks. if yes/no, give reason.
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