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DB Nimbostratus
Nimbostratus
Mar 02, 2010What happens when LTM marks a node "down"
When my LTM (9.3.1) sees a node in a server pool go down because one of it's two health monitors fails, I would expect the server to no longer have traffic hitting it. However my server guys tell me t...
hoolio Cirrostratus
Cirrostratus
Mar 02, 2010LTM should not send new connections to a pool member that's marked down.  What LTM does with existing connections after a monitor has marked a pool member down depends on the pool's "action on service down" setting: 
From the online help for "action on service down":
* None: Specifies that the system does not select a different node. Selecting None causes the system to send traffic to the node even if it is down, until the next health check is done.
* Reject: Specifies that the system sends an RST or ICMP message.
* Drop: Specifies that the system simply cleans up the connection. (removes the connection from the connection table)
* Reselect: Specifies that the system selects a different node. Selecting Reselect causes the system to send traffic to a different node after receiving the message that the original node is down.
Aaron
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