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74 ServerIron ADX Advanced Server Load Balancing Guide
53-1002435-01
Content aware cache switching
2
A server group can contain one or more cache servers. When a server group consists of more than
one cache server, the ServerIron ADX uses a hashing algorithm to select one of the cache servers,
and directs the request to the selected cache server. When configuring content aware cache
switching, you establish the IP address of each cache server and specify the server group to which
it belongs.
To configure CacheServer1 in Figure 19 on page 71, enter a command such as the following
ServerIronADX(config)# server cache-name CacheServer1 192.168.1.101
ServerIronADX(config-rs-CacheServer1)# port http group-id 1 1
ServerIronADX(config-rs-CacheServer1)# exit
Syntax: port http group-id <server-group-id-pairs>
The port http group-id command indicates the server groups to which the cache server belongs.
The server group is expressed as a pair of numbers, indicating a range of server group IDs. The first
number is the lowest-numbered server group ID, and the second is the highest-numbered server
group ID. For example, if a cache server belongs only to the server group with ID = 1, the last two
numbers in the port http group-id command would be 11. (Note the space between the two
numbers.) If a cache server belongs to server groups 1 – 10, the last two numbers in the command
would be 110. Valid numbers for server group IDs are 0 – 1023.
To include a cache server in groups that are not consecutively numbered, you can enter up to four
server group ID pairs. For example, to include a cache server in groups 1 – 5 and 11 – 15, you
would enter the following command.
ServerIronADX(config-rs-CacheServer1)# port http group-id 1 5 11 15
You can also specify the server group ID pairs on separate lines, by entering commands such as the
following.
ServerIronADX(config-rs-CacheServer1)# port http group-id 1 5
ServerIronADX(config-rs-CacheServer1)# port http group-id 11 15
The configuration for the remaining cache servers in Figure 19 is shown below. These commands
place CacheServer2 in server group ID = 1 (along with CacheServer1) and CacheServer3 in server
group ID = 2.
ServerIronADX(config)# server cache-name CacheServer2 192.168.1.102
ServerIronADX(config-rs-CacheServer2)# port http group-id 1 1
ServerIronADX(config-rs-CacheServer2)# exit
ServerIronADX(config)# server cache-name CacheServer3 192.168.1.103
ServerIronADX(config-rs-CacheServer3)# port http group-id 2 2
ServerIronADX(config-rs-CacheServer3)# exit
Assigning the cache servers to a cache group
To activate content aware cache switching (as in Figure 19), you create a cache group, assign the
cache servers to that group, and specify a CSW policy to be active for the cache group, such as the
following.
ServerIronADX(config)# server cache-group 1
ServerIronADX(config-tc-1)# cache-name CacheServer1
ServerIronADX(config-tc-1)# cache-name CacheServer2
ServerIronADX(config-tc-1)# cache-name CacheServer3
ServerIronADX(config-tc-1)# csw
ServerIronADX(config-tc-1)# csw-policy p1
Syntax: csw
Syntax: csw-policy <policy-name>
- 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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