TWO ISP ON TWO CISCO ROUTER

[presales21]

Hi Team,

I require solution on following scenario.

1) In HO we have one cisco router where two mpls links are terminated.

2) In Branch Offices TWO ISP with Two Cisco Router and one L2 switch.

In Branch Office I want to terminate two isp in two c841 routers and two LAN output from both routers will be terminate on 2960 series L2 Switch and some users traffic will go through ISP1 and other will ISP2  and if any ISP link is down ,traffic on that ISP will automatically shift to other ISP.

what configuration do on branch routers and switch.

what configuration do on HO router.

Please help for the same.

[Philip D'Ath]

You are asking a lot, and providing little information.  You don't even mention the quantity of branches.

How about having a go yourself, and then asking about specific configuration assistance when you run into problems.

You should investigate technologies like HSRP, iWAN, and IPSec Virtual Tunnel Interface.

[Mark Malone · Accepted solution]

Hi

as an option in HO office you could use BGP multi home then 2 links 1 router , make sure all routes are on both links coming in and then change the metrics to allow one link to be preferred or load balance across them both at same time so its not active/standby

You can easily manipulate subnets through the BGP protocol attached to the neighbour statements with route-maps , distribute-lists etc , there are multiple ways

For branch the branch see

http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13762-40.html#anc27

see this link screenshots with sample config HO office

http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13762-40.html#anc10

example route manipulation BGP

https://supportforums.cisco.com/document/126691/understanding-bgp-best-path-selection-manipulation

[presales21]

thank you mark,

i got it.