dual router with dual ISP load balancing

[arumugasamy]

Dear Pros,

I need your help in designing the dual isp scenarios. There are 2 cisco routers installed as edge internet routers. Each router's WAN connected to defferent ISP.The gigabit 0/0 of both routers are connected in the common 172.20.21.0 network segment with hsrp VIP 172.20.21.1. The physical interface IP of those routers is 172.20.21.5, 172.20.21.6. The failover firewall outside interface connected to this same segment with IP of 172.20.21.3 and 172.20.21.4. The firewall default gateway is HSRP VIP of router 172.20.21.1.

Please help me how can we achieve the dual ISP load balancing using those 2 separate rouetrs. If one router fails another should take over as redundant router.

Thanks in advance

swami

[Giuseppe Larosa]

Hello Arumugasamy,

see the following examples for BGP multihoming (if you are interested in BGP).

If you haven't got your own public ip address block you need to use NAT and this leads to be able to achieve redundancy but not load balancing.

See also:

http://www.cisco.com/en/US/tech/tk365/technologies_configuration_example09186a00800945bf.shtml#conf5

and for NAT multihoming design

http://www.cisco.com/en/US/tech/tk648/tk361/technologies_white_paper09186a0080091c8a.shtml

Hope to help

Giuseppe

[arumugasamy]

Dear,

The customer does not like to go for BGP solution.

Is there any way to do this?

Thanks

swami

[Giuseppe Larosa]

Hello Swami,

without BGP you can still offer at least redundancy.

You can consider to use reliable static routing on the two edge routers.

In this way you use an ip sla or rtr object to check the healthy of each WAN link /ISP network with an IP reachability test.

see

http://www.cisco.com/en/US/docs/ios/12_3/12_3x/12_3xe/feature/guide/dbackupx.html

Then you should redistribute these static routes in an IGP protocol (EIGRP or OSPF) with better seed metric on the primary router.

Using HSRP or GLBP on the client Vlans complete your solution.

Hope to help

Giuseppe

[narayanankl]

Hi Arumugaswamy,

I am not experince inthis field, anyway i need a solution for one router with 2 internet loadbalance. For your need please check the below mentioned link, if its work please let me know.

http://www.cisco.com/en/US/docs/ios/12_4t/oer/configuration/guide/h_oerstr.html#wp1060448

[arumugasamy]

Dear,

My customer requirement is dual edge routers scenarios.

There are no way except BGP

SWAMI