A site has assigned the ICMP monitor to all nodes and a custom monitor, based on the HTTP template, to a pool of web servers. The HTTPbased monitor is working in all cases. The ICMP monitor is failing

A passing pool-level HTTP monitor alone is not sufficient; the node-level ICMP monitor failure makes the node unavailable, which cascades to all pool members on that node.

Only the 2 pool members whose corresponding nodes fail the ICMP monitor are affected; the remaining pool members on passing nodes continue to receive traffic normally.

'Disabled' is an administrative state set intentionally by an operator via the management interface, not a state resulting from a monitor failure.

BIG-IP applies the most restrictive health status across all monitors in the hierarchy - node, pool, and pool member. When the ICMP node monitor fails for 2 nodes, the pool members on those nodes are marked 'unavailable' because the underlying node is considered down, overriding the passing HTTP pool monitor result.