Brocade Communications Systems ServerIron ADX 12.4.00 Service Manual Page 31
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ServerIron ADX Advanced Server Load Balancing Guide 19
53-1002435-01
Configuring SIP SLB
1
SIP Stateful sample configuration
Load Balancing SIP over TCP
Like HTTP, SIP protocol follows a request and response model. However, SIP transactions are
independent of the underlying transport layer protocol. For example, some transactions run over
UDP connections, some get transported over TCP connections, and some use a combination of TCP
and UDP interchangeably, depending on the size of the data.
Generally most SIP deployments are observed over UDP transport. However, some service
providers use TCP instead of UDP to offer advanced SIP based voice and video services. The
primary reason for this method is to avoid the fragmentation experience over UDP connections and
to use the congestion avoidance mechanism of TCP.
In most cases, TCP and UDP are used interchangeably, depending on the data length. This behavior
poses a few challenges for the SIP application delivery controller vendor. Support for TCP in
addition to UDP is provided for seamless deployment of advanced SIP services. This
implementation is based on RFC 3261.
The sections below describe sample supported topologies for TCP SIP SLB.
Connection handling with SIP requests initiated by client
When a SIP client initiates a call using TCP, it uses either a separate TCP connection for each call or
groups multiple calls together over a single TCP connection.
When a ServerIron receives these calls over a single or multiple TCP connections, it load balances
them among back end proxy servers. The call persistence is maintained using SIP Call-ID.
For the server side connection, the ServerIron uses either a single or multiple TCP connections with
or without using source NAT of the client IP address.
Client side: No connection reuse
Figure 6 shows that each SIP call uses a separate TCP connection. Each request has its unique
Call-ID. ServerIron load balances these requests among backend SIP proxy servers.
- ServerIron ADX 1
- Document History 2
- Contents 5
- About This Document 9
- Command syntax conventions 10
- Notice to the reader 11
- Related publications 11
- Web access 12
- E-mail and telephone access 12
- SIP Server Load Balancing 13
- SIP terminology 16
- SIP message headers 17
- Max-Forwards 18
- Sample deployment topologies 19
- RINGING F4 21
- Configuring SIP SLB 23
- Configuring health check 26
- Example 29
- Load Balancing SIP over TCP 31
- Call-ID3 33
- Call-ID1 34
- Rehashing the SIP hash table 38
- Debug commands 40
- SIP SLB command reference 42
- Sample configuration 43
- Transparent Cache Switching 45
- Stateful caching 47
- Sample Deployment Topologies 48
- TCS with spoofing 49
- TCS with destination NAT 49
- TCS with Source NAT 50
- VIPs with reverse proxy 51
- Configuring TCS 52
- Defining a cache server 53
- Enabling TCS 56
- Other TCS options 57
- Cache Route Optimization 58
- Enabling Destination NAT 62
- Configuring Source NAT 62
- Examples 64
- Distribution algorithm 66
- • Maximum connection rate 72
- Enabling FastCache 73
- Enabling remote cache 73
- Shutting down a cache server 74
- Passive FTP for TCS 75
- Traffic flow of passive FTP 76
- Topologies supported 76
- High availability support 77
- ServerIron ADX 2 78
- Policy based caching 79
- Show commands 81
- Content aware cache switching 82
- Setting up the CSW policies 84
- Configuring the cache servers 85
- This field... Displays 91
- Displaying cache information 95
- TCS information (Continued) 96
- Sample configurations 98
- Applying IP policies 99
- Defining the caches 99
- Defining the cache groups 100
- 53-1002435-01 101
- Policy-based caching 102
- Asymmetric TCS (FastCache) 103
- Policy-based cache failover 105
- TCS with reverse proxy 107
- Layer 3 TCS 109
- Basic TCS configuration 110
- Commands for ServerIron ADX A 111
- Commands for ServerIron ADX B 112
- Internet 114
- 10.10.20.104 114
- 10.10.20.102 114
- Router NI1 117
- Router NI2 117
- OSPF Area 0 117
- Commands for Router NI2 121
- Active-standby TCS 125
- Configuring Router R1 126
- Configuring ServerIron ADX A 126
- Configuring ServerIron ADX B 127
- NetCache servers 128
- NetCache C720 cache server 128
- TABLE 9 Hashing methods 130
- Parsing the host string 133
- Force rehash 136
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