Load blancing on WAN

Answered Question
Mar 19th, 2007

A customer who has 2mg link from ISP1 would like to purchase 2nd and 3rd 2mg from ISP2,

The link from ISP1 is connected on RT1 and The link from ISP2 is connected on RT2 ( RT2 has 2 link )

can some one tell me how can i do a load blance as well as each link should be work as back as well to one another

I have this problem too.
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Correct Answer by spremkumar about 9 years 8 months ago

Hi Anthony

Do you have your own ip blocks available with you ? or using the subnets given by the ISPs ?

if you are having your own ip blocks you can try configuring GLBP and have outbound load balancing.

I don't think you will get inbound load balancing as well.

regds

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Correct Answer
spremkumar Mon, 03/19/2007 - 02:07

Hi Anthony

Do you have your own ip blocks available with you ? or using the subnets given by the ISPs ?

if you are having your own ip blocks you can try configuring GLBP and have outbound load balancing.

I don't think you will get inbound load balancing as well.

regds

thomas.anthony Mon, 03/19/2007 - 18:53

Thanks for the Message, what I?m looking at is, The LAN traffic via this 2 router with 3 links should be equally load lanced and each should be back up to each other

Amit Singh Mon, 03/19/2007 - 02:30

When we have 2 different ISP;s, I would suggest for more controlled and filtered way for sending the traffic from 2 different ISP's.

I would suggest to use NAT and PBR (policy based routing).I would first look at the kind of traffic, users, applications that I have to go the outisde world. Once the traffic is determined I would see the traffic distribution of the users over the two links. I would use my application, mail traffic to go thorough one link and internet and other traffic to use another link.I will make both the links as back up of each other.In case of one of the link goes my all the traffic will use the other link. I would suggest to implement proper QOS and rate limiting to drop the unwanted traffic.

NAT:

http://www.cisco.com/warp/public/556/12.html

Policy Based Routing:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/12cgcr/qos_c/qcpart1/qcpolicy.htm

www.cisco.com/warp/public/732/Tech/plicy_wp.htm

QOS:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124cg/hqos_c/qchintro.htm

HTH,Please rate if it does.

-amit singh

thomas.anthony Mon, 03/19/2007 - 18:53

Thanks for the Message, what I?m looking at is, The LAN traffic via this 2 router with 3 links should be equally load lanced and each should be back up to each other

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