How can I accomplish load balancing with redundancy?

1,545 pts.
Tags:
Access Control List
Cisco Routers
configuration
ISPs
Load balancing
Natting
Networking
OER
Redundancy
Routing
I have two links with different ISP's and both the (512Kbps) links are terminated on separate Cisco routers (2811). Currently, we are using one link. Another link is new. I want to do load sharing and redundancy between them. Right now I am not using BGP (routers are configured in simple manner). My client and I are concerned with cost. My present network scenario looks like this: Internet Ri (ISP 1) -- Layer 3 switch (working here as a simple switch) --- Firewall 1 (Cisco ASA5510) -- Firewall 2 (Cisco ASA5510) --- LAN. On Firewall 1, remote and site-to-site VPN is configured -- one DMZ. My LAN is in the 172.16.1.xx series; my DMZ is in 172.16.4.10, and after 172.16.1.30 is used for the desktop, 192.168.x.x is the management IP. Right now I have one other Internet link (512kbps) from a different ISP. So please tell me how I can accomplish load balancing with redundancy. I've tried OER but unsuccessfully, due to IOS image (c2800nm-ipbasek9-mz.124-11.T.bin) and ISP's AS. Can it be possible through natting, and ACL? Please help me with the OER or anything I've mentioned. If possible, please show me a sample configuration.
ASKED: March 12, 2008  6:53 PM
UPDATED: May 6, 2008  7:24 PM

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Thanks. We'll let you know when a new response is added.

It’s a little tricky. Which direction do you want to do load-balancing? For incoming traffic to your network either you need to do BGP with your ISPs or you need to have a link load balancer kind of a box which has intelligence to understand the load on each link. You might need an AS number from the ISP. As far as the load balancing of outbound traffic from your network is concerned, you need to have a firewall with a load-balancing capability on which both the links are terminated through routers.

You can find sample configurations from networking sites on the Internet. You can also try <a href=”http://cisco.com/”>Cisco.com</a>.

Hope this helps.

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  • Kb3cgj
    Load-Balancing which direction? Both circuits are going to have to be on the same firewall...or a third router will be need in the middle. You will need a firewall that supports load balancing (common feature) for outbound balancing. In-Bound load balancing will require BGP if the uplinks are with different carriers. Getting an AS # isn't expensive but I think it will be difficult to justify to ARIN that it is a necessity with only a 512K uplink.
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