Brocade Communications Systems ServerIron ADX 12.4.00 Service Manual Page 37

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ServerIron ADX Advanced Server Load Balancing Guide 25
53-1002435-01
Configuring SIP SLB
1
ServerIronADX(config)#server virtual vs-sip 172.28.8.100
ServerIronADX(config-vs-sip)# port sip
ServerIronADX(config-vs-sip)# port sip sip-stateful
ServerIronADX(config-vs-sip)# port sip sip-keyfield-call-id
ServerIronADX(config-vs-sip)# port sip sip-alternative-port-start 5061
max-connections 3
ServerIronADX(config-vs-sip)# bind sip rs1 sip
Other Load Balancing SIP over TCP options
Configuring periodic keepalive
Use the keepalive command to periodically check the real server state after bring-up. You can
enable keepalive from the port profile configuration or from the real server port configuration.
SIP port profile configuration
To configure keepalive from the SIP port profile configuration, use the following commands.
ServerIronADX(config)# server port sip
ServerIronADX(config-port-sip)# udp keepalive protocol sip
Syntax: udp keepalive protocol sip
Real server port configuration
To configure keepalive from the real server port configuration, use the following commands.
ServerIronADX(config)# server real proxy-server-1
ServerIronADX(config-rs-proxy-server-1)# port sip keepalive
Syntax: port sip keepalive
Configuring a DSCP value for SIP health checks
During periods of network congestion, SIP health checks don’t get high enough priority in a network
which causes servers to needlessly fail. Consequently, high-priority services such as VOIP can
suffer service interruptions. This feature allows you to set a DSCP value in the IP header of SIP
health-check packets. The network can then be configured to grant sufficient priority to the SIP
heath-check packets to ensure robust service.
In the following example, a DSCP value of 46 is set for health check packets sent to SIP proxy
service 1.1.9.5:SIP.
ServerIronADX(config)# server real si-server 1.1.9.5
ServerIronADX(config-rs-sip-server)# port sip sip-proxy-server
ServerIronADX(config-rs-sip-server)# port sip hc-dscp-mark 46
Syntax: port sip hc-dscp-mark <DSCP-value>
The <DSCP-value> variable can be set to a value between 0 and 63.
NOTE
When this command is configured for real service ports other than that of a SIP service, the value
is ignored during health check. Examples include: sip-proxy-server, sip-redirect-server, sip-registrar,
and sip-both-registrar-proxy-server.
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