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Rash_75385's avatar
Rash_75385
Icon for Nimbostratus rankNimbostratus
Feb 20, 2010

LTM Tracking NextHop

Hello,

 

 

I am looking at the possibility of using a pair of LTMs for a high availability solution. I want to set up a pair of LTM's in high availability mode. What I want to know is can the F5 LTM have a nexthop route that is based on testing the availability of an IP address further up the line? In other words can I set up a monitor to ping an ip address and if that ip address is responding I use one route if not then another route is used?

 

 

In Cisco speak this is called tracking.

 

 

Thanks a lot

 

 

R
config
design
  • hooleylist's avatar
    hooleylist
    Icon for Cirrostratus rankCirrostratus
    Feb 21, 2010
    Hi Rash,

     

     

    Yes, you can set up network (Performance Layer4 / FastL4) virtual server or a default route which points a pool of gateways. On the gateway pool, you can use a monitor which marks the pool members up or down based on the result of an ICMP check of a routed host. This is described in SOL7015:

     

     

    SOL7215: Configuring multiple default routes on the BIG-IP system

     

    https://support.f5.com/kb/en-us/solutions/public/7000/200/sol7215.html

     

     

    and

     

     

    SOL8971: Creating transparent ICMP health monitors

     

    https://support.f5.com/kb/en-us/solutions/public/8000/900/sol8971.html

     

     

    One advantage of using the VIP is that you can configure destination address persistence to ensure multiple requests to the same destination are sent out the same link. Or you can use priority groups to ensure one gateway is always unless it is marked down.

     

     

    Aaron