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crate_17871's avatar
Icon for Nimbostratus rankNimbostratus
Sep 06, 2011

Link controller for redundant link solution with block publishing

Good Day Community,



Need some assistance formulating a solution using F5 products.


I have two different ISP links terminating on two Cisco routers, however, each ISP link terminates on one router, i.e., ISP 1 terminates R1, ISP 2 terminates R2.


Basically, both of them have a point to point link with their relevant ISP, however ISP1 provides a /27 public block.


From this block, are web servers (load balanced by F5 ofc, lol), security gateways, ...


What I need is some way of publishing the block from ISP 1 to ISP 2, if the ISP 1 link fails. I thought about BGP however, the ISP 1 is not playing ball, so I need to find an alternative.


Any suggestions?



Just a further note, the DNS is not hosted in this network.




1 Reply

  • George_Watkins_'s avatar
    Historic F5 Account
    Hi crate,



    You're not going to be able to use the Link Controller to publish that IP space on the adjacent link. What you are describing here is BGP ( and would require some heavy configuration with your ISP. If you had an equivalent number of addresses on ISP2 you could use GTM to failover. Hope this helps,