Brocade Communications Systems ServerIron ADX 12.4.00 Service Manual download pdf (Page 19)

ServerIron ADX Advanced Server Load Balancing Guide 7

53-1002435-01

SIP SLB and Call Persistence using ServerIron ADX

• Proxy

• Redirect

• Registrar

The ServerIron supports the following methods in accordance with RFC 3261:

• INVITE

• REGISTER

• ACK

• CANCEL

• BYE

• OPTIONS

Additionally, the following methods are supported:

• SUBSCRIBE

• NOTIFY

• Other proprietary methods

SIP and Call Persistence specifications

The SIP Server Load Balancing feature has the following specifications:

• By default, server selection is persistent on Call-ID.

• Pass-through SIP traffic from real SIP servers to SIP clients gets translated. The ServerIron

replaces source IP (SIP server real IP) with Virtual IP (VIP)

• The ServerIron does not modify any of the SIP header fields.

• No SIP Aware NAT support.

• This implementation is based on RFC 3261.

NOTE

The ServerIron SIP SLB is not implemented as a SIP proxy server, but rather as a load balancer of

proxy or registrar traffic.

NOTE

The ServerIron does not modify any of the SIP headers. It also does not perform SIP-aware NAT.

Sample deployment topologies

ServerIron switches offer application-aware advanced intelligence for SIP server load balancing.

The following sections describe some SIP Server Load Balancing scenarios.

Design #1: SIP Server Load Balancing with DSR mode

Figure 3 shows an SIP server farm built around ServerIron application switches for higher

availability, accelerated performance, on-demand scalability, and robust security.

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Brocade Communications Systems ServerIron ADX 12.4.00 Service Manual Page 19