Forum Discussion
Albert_Coll
Cirrus
CirrusIrule to modify the VIP route advertisement setting upon pool down
Hi, I have an Big-IP LTM in which I need to create a procedure to set a VIP "route advertisement" setting to "disabled" whenever a pool goes down. I think that this can be achieved by an iRule. Do...
What you could do is create a gateway monitor and give it an Alias Address of the gwy. Assign that to the pool as a second monitor that is the default pool of the virtual server the vip address is assigned to. That way, when the gwy fails, it marks the pool members down which in turn will retact the advertisment of the route.
Albert_CollCirrus
CirrusHi Jim,
Thank you for your post.
The Big-IP LTM VM is integrated into the network through two Firewalls:
* There is a static default route pointing to a FW in a DMZ, which is the incoming interface of all user's traffic.
* There is another firewall on another interface, through which a BGP session is established to a PE located beyond it.
I redistribute the VIP to BGP to this PE through a redistribute kernel & a route map.
Now, the network manager requests me to cease advertising the VIP through BGP as soon as the default route fails: I created a pool to properly monitor the default gateway, so that this pool gets down when the gwy stops replying icmps.
What I would need is to define some function (irule, iapp maybe) to disable the "route advertisement" flag when the pool gets down, or triggering some BGP reconfiguration to remove the VIP advertisement.
Regards.
Is the pool that monitors the GWY the default pool of the virtual server that is using the VIP that is being advertised? Also, is there a single or multiple pool members?
- Albert_Coll
The pool monitoring the gateway is not the Virtual Server default pool: This pool is unassociated.
The default gateway IP address is the only member of this pool.
- Albert_Coll
But I also posted a reply to James: I guess I shoud use BFD for that purpose.
Thank you.
What you could do is create a gateway monitor and give it an Alias Address of the gwy. Assign that to the pool as a second monitor that is the default pool of the virtual server the vip address is assigned to. That way, when the gwy fails, it marks the pool members down which in turn will retact the advertisment of the route.