GTM and Topology? Possible without iRule?

Hi,

My idea is:

• Set Wide IP with Topology LB and:
  • order 0 - dc1_pool
  • order 1 - dr1_pool
• Create pool

  location_pool

  with VS pointing to location returning info about host (LDNS), and monitor setting VS down when host is in DR1

• Assign rule like that to Wide IP (WIP)

  when DNS_REQUEST { check where LDNS is, if below true it is in DR1 if { [active_members location_pool] < 1 } { check if there are any active members in DR1 pool/location if { [active_members dr1_pool] > 0 } { pool dr1_pool } else { Use DC1 pool pool dc1_pool } } }

So if first test in iRule is false WIP is using configured LB - first sends IPs from dc1_pool, if this pool is down from dr1-pool.

If it's true (host in DR1) there is check if dr1_pool is UP (any member active), if not IPs from dc1_pool are returned.

Good or bad idea, better way to do that?

Piotr