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Configuring Server Load Balancing
IOS SLB Configuration Task List
IPC-149
Cisco IOS IP Configuration Guide
h. Restart the connection, after waiting no longer than the sticky timeout value.
i. Enter the show ip slb conns EXEC command again.
j. Examine the real server connection counts again, and verify that the sticky connection is assigned
to the same real server as before.
Step 6 Start additional client connections.
Step 7 Enter the show ip slb reals detail EXEC command.
Step 8 Verify that the the connection counts are increasing.
Verifying Server Failure Detection
To verify that server failures are detected correctly, perform the following steps:
Step 1 Use a large client population. If the number of clients is very small, tune the numclients keyword on the
faildetect SLB real server configuration command so that the servers are not displayed as failed.
Step 2 Enter the show ip slb reals detail EXEC command to show the status of the real servers.
Step 3 Examine the status and connection counts of the real servers:
• Servers that failed show a status of failed, testing, or ready_to_test, based on whether IOS SLB is
checking that the server came back up when the command was sent.
• When a real server fails, connections that are assigned but not established (no SYN or ACK is
received) are reassigned to another real server on the first inbound SYN after the reassign threshold
is met. However, any connections that were already established are forwarded to the same real server
because, although it may not be accepting new connections, it may be servicing existing ones.
• For weighted least connections, a real server that has just been placed in service starts slowly so that
it is not overloaded with new connections. (See the “Slow Start” section for more information on
this feature.) Therefore, the connection counts displayed for a new real server show connections
going to other real servers (despite the lower count of the new real server). The connection counts
also show “dummy connections” to the new real server, which IOS SLB uses to artificially inflate
the connection counts for the real server during the slow start period.