Nortel Networks WEB OS 212777 - Manual (Page 243)

Web OS 10.0 Application Guide
Chapter 10: Health Checking n 243
212777-A, February 2002
Configuring the Switch for WTLS Health Checks
1. Select the group with the WAP gateway.
2. Use the sndcnt command to enter the content to be sent to the WSP gateway.
3. Select a port number other than 9203, if you want to change the port number on which
your gateway is listening to WTLS traffic.
4. Apply and save your configuration.
LDAP Health Checks
Lightweight Directory Access Protocol (LDAP) health checks enable the switch to determine
whether the LDAP server is alive or not. LDAP versions 2 and 3 are described in RFC 1777
and RFC 2251.
The LDAP health check process consists of three LDAP messages over one TCP connection:
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Bind request: The switch first creates a TCP connection to the LDAP server on port 339,
which is the default port. After the connection is established, the switch initiates an LDAP
protocol session by sending an anonymous bind request to the server.
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Bind response: On receiving the bind request, the server sends a bind response to the
switch. If the result code indicates that the server is alive, the switch marks the server as
up. Otherwise, the switch marks the server as down even if the switch did this because the
server did not respond within the timeout window.
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Unbind request: If the server is alive, the switch sends a request to unbind the server.
This request does not require a response. It is necessary to send an unbind request as the
LDAP server may crash if too many protocol sessions are active.
If the server is up, the switch closes the TCP connection after sending the unbind request. If the
server is down, the connection is torn down after the bind response, if one arrives. The connec-
tion will also be torn down if it crosses the timeout limit, irrespective of the server’s condition.
>> Main# /cfg/slb/group 1 (Select the Real Server Group 1 menu)
>> Real server group 1# health wtls
>> Main# /cfg/slb/adv/wap
>> WAP Health Check Menu # wtlsprt 10203
>> WSP Health Check# apply