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70 ServerIron ADX Advanced Server Load Balancing Guide
53-1002435-01
Content aware cache switching
2
Content aware cache switching
Content aware cache switching (CSW in a TCS environment) uses information in the header of an
HTTP request to determine how or if content should be retrieved from a cache server. Using the text
in a URL string, the ServerIron ADX sends a request from a client to a cache server or to the Internet
according to user-defined policies.
You can configure content aware cache switching on the ServerIron ADX to do the following:
• Group cache servers by content; for example, GIF files can be cached on one cache server and
HTML files on another
• Cause HTTP requests containing a given URL string always to go to the same cache server,
minimizing content duplication among cache servers
• Use information in the URL string or Host header field of an HTTP request to determine how the
requested content should be cached
• Explicitly direct requests for dynamic content to the Internet, rather than to a cache server
• Use directives in the HTTP 1.0 or 1.1 header to determine whether requested content should
be cached
The following sections discuss how CSW operates in a TCS environment and present some sample
configurations that demonstrate the features of content aware cache switching.
How CSW works
The CSW is the ServerIron ADX's ability to direct HTTP requests to a server, or group of servers,
using information in the text of a URL string. The ServerIron ADX examines the contents of a URL
string and makes a decision about where to send the packet based on selection criteria in
user-defined policies. If text in the URL string matches the selection criteria, the HTTP request is
sent to a server group specified in the policy.
NOTE
"URL string" is defined as the contents of the Request-URI part of the Request-Line in an HTTP
request message. This information usually consists of the absolute pathname (directory and
filename) of a resource. For example,
/doc/ServerIron ADX/1199/url_switching.html
The URL string can also be the input to a process running on a remote server. For example,
/quote.cgi?s=BRCD&d=1d
The network location of the resource is specified in the Host header field in an HTTP request
message. For example,
Host: www.brocade.com
The ServerIron ADX can examine both the URL string and Host header field when determining where
to send the HTTP request. Refer to RFC 1945 or RFC 2616 for more information on HTTP request
messages.
The selection criteria in a policy can be a string of characters starting from the beginning of the URL
string, end of the URL string, or within any part of the URL string. For example, selection criteria can
be a URL string that starts with the text “/home”. In a TCS environment, when a client sends an
HTTP request that has a URL string beginning with the text “/home", the policy can direct that
request to a specific group of cache servers (or to another CSW policy for additional matching).
- 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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