I have 4 DCs and would like to implement "Topology load balancing" at wide-ip level.
Any requests from respective DC's should go to the pools configured in those DCs.
I have acheived this routing for 4 DCs using topology records but what happens when a request comes from another region and there is no topology record for it? Does it fallback to round-robin ?
I have gone through some tests in my lab, by creating topology records that don't match my request and the responses were sent by round robin, each answer was coming from a pool. From what I understand, when a pool doesn't match with a topology record, the weight becomes 0, and that means all the pools will have equal weights ( all zeros) as no records matched, that's why the responses are coming back with round robin.
here is an example:
If there is no matching topology record that contains both the LDNS request source and a destination; therefore, the BIG-IP system assigns a score of zero to the pool.
you can check some other examples in this article:
I have gone through some tests in my lab, by creating topology records that don't match my request and the responses were sent by round robin, each answer was coming from a pool. From what I understand, when a pool doesn't match with a topology record, the weight becomes 0, and that means all the pools will have equal weights ( all zeros) as no records matched, that's why the responses are coming back with round robin.
here is an example:
If there is no matching topology record that contains both the LDNS request source and a destination; therefore, the BIG-IP system assigns a score of zero to the pool.
you can check some other examples in this article:
