Brocade Communications Systems ServerIron ADX 12.4.00 Service Manual download pdf (Page 33)

ServerIron ADX Advanced Server Load Balancing Guide 21

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Configuring SIP SLB

FIGURE 7 Reuse of TCP connection

Server side connection: With source NAT

If source NAT is enabled, then the ServerIron uses source NAT IP addresses and ports for

establishing connections with proxy servers.

Server side connection: Without source NAT

A ServerIron may be configured with a maximum number of TCP connections to a specific proxy

server.

If source NAT is disabled on the ServerIron, then the ServerIron establishes new TCP connections

based on connection reuse setting:

• Connection reuse disabled - If a new SIP requests is received and the configured maximum

number of server connections has been reached, then ServerIron drops any new request. This

is the default behavior.

• Connection reuse enabled - If a new SIP requests is received and the configured maximum

number of server connections has been reached, then ServerIron reuses an established

connection to process client request.

NOTE

With either setting, the client identity (IP address and port) is preserved since source NAT is not

enabled.

SIP Proxy Server

Call-ID1...

Call-ID3...

Call-ID2

ServerIron

Call-ID1...Call-ID2...Call-ID3

Mega-proxy

Several SIP messages

using one TCP Connection

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 135 136

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Brocade Communications Systems ServerIron ADX 12.4.00 Service Manual Page 33