I have a configuration 4 T1v2 WAN Interface Card Cisco 2811-type router. Two WAN interface cards for the private line. The other two WAN interface cards for connecting to the Internet, T1 lines. Currently, only one line in use. We have just from a different Internet service provider has purchased another set of IP addresses of T1 lines. I want those lines to connect to the Internet load balancing, and failure can be a time line to provide operational transfer function. I do not know how to set this configuration. My Internet service providers need to do? I need to set up the router?
Your Internet service provider does not need to do anything. To achieve load balancing, the first step is to create an access list, your network is divided into two. According to the access list, you can define half of the IP address to a line, the other half of the definition of IP address to another line.
Assuming your network is 172.16.128.0/24. "Allow IP address 10.172.16.128.0 0.0.0.254 access list 1" will only be allowed to double the number of IP addresses. So you now have two subnets. You have to IP address of each request and modify this list. Now you can create a route map.
Route map 10 ISP1_primary (routing table 10, the first major ISP)
Match access-list 1 (with the access list 1 match)
Set interface ISP1_interface (based interface is the first major ISP interface)
Route map 20 ISP1_primary (routing table 20, the first major ISP)
Match access-list 1 (with the access list 1 match)
Set interface ISP2_interface (based interface is the second major ISP interface)
Similarly, the second ISP you need to create another routing table.
Route map 10 ISP2_primary (routing table 10, the second major ISP)
Match access-list 2 (with the access list 2 match)
Set interface ISP2_interface (based interface is the second major ISP interface)
Route map 20 ISP1_primary (routing table 20, the second major ISP)
Match access-list 2 (with the access list 2 match)
Set interface ISP1_interface (based interface is the first major ISP interface)
Access list 2 is another match with the network access list. You need to network with their own separate ways. Another option is to increase the floating static route on the router.