Technical data

ServerIron ADX Advanced Server Load Balancing Guide 25

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Configuring SIP SLB

Example

Stateful SIP session handling in the event of a proxy server failure

ServerIron ADX can seamlessly handle failure of proxy servers while running in stateful mode. The

ServerIron ADX can be enabled to reroute subsequent SIP packets on an existing flow for a failed

proxy server to an available healthy proxy server. However, note that the back-end SIP proxy server

should have the capability of handling such SIP calls that were originally serviced by a different

proxy server.

This feature is generally useful when back-end proxy servers are configured in cluster

configuration.

ServerIronADX(config)# server sip enable-session-failover-on-server-failure

Syntax: [no] server sip enable-session-failover-on-server-failure

NOTE

This command is not required when ServerIron ADX is configured in SIP stateless mode. With

stateless mode, ServerIron ADX automatically assigns a new proxy server when packets arrive on an

existing flow to failed server.

Debug commands

The following commands and the counters they display are useful for internal debugging purposes.

Showing various SIP counters

Syntax: show sip debug [parser | session| sip-transaction | tcp-connection | udp-process]

ServerIronADX# show server sip-hash proxy proxy-domain-1

SIP HashTable for virtual server :<proxy-domain-1>

Summary for virtual port <5060>:

==============================

RS|Port #buckets RS|Port #bucketss

172.16.1.155|sip 0

Total active real ports bound to vport <5060>: 0

# of average buckets(proxy) for each real port: 0/256

Details for virtual port <5060>

==============================

Hash Real-Server|Port TS Hash Real-Server|Port TS

Total used buckets for vport <5060> : 0

ServerIronADX# show sip debug parser

SIP Parser Counters:

PARSER ERR :1 PARSER PKT CORRUPT :4

PARSER MEM ALLOC ERR :0 PARSER MULTI CALLID :0

PARSER ABNORMAL HDR END :0 PARSER PKT HDR TOO LONG :8

PARSER UNKNOWN PKT :21 PARSER CONTENT TOO LONG :0

PARSER CSEQ NOT FOUND :1 PARSER PACKET MALFORMED :0