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ServerIron ADX Advanced Server Load Balancing Guide 117
53-1002435-01
Cache Persistence using URL Hashing
2
On this page, disable IP Fast Output. When this feature is disabled, the cache server performs a
route lookup and sends the packet to the correct destination address.
Cache Persistence using URL Hashing
The ServerIron ADX enables traffic distribution among cache servers in a TCS setup after
inspecting and hashing based on the request URL. This enables cache persistence based on the
requested URL and minimizes duplication of content among multiple cache servers.
The hashing can be done on a complete URL or a portion of the URL. The following choices are
available:
• Complete URL
• Path only
• Path and Parameters only
• Host only
• Host and Path only
Additionally, you can identify a sub-portion of either the complete URL or the Host portion of the
URL to perform the hashing on.
The hashing method is specified within a CSW policy definition as an action to be taken when a
match is made.
NOTE
In previous versions of the ServerIron ADX software, this feature was configured using the csw-hash
url command within the server cache-group configuration. This command is no longer available.
The following example directs the ServerIron ADX to hash on the complete URL when the conditions
in the “r1” CSW rule is met.
NOTE
Since hash-persist action is a secondary action, you must add a forward action as shown in the
following example, before adding a hash-persist action.
ServerIronADX(config)# csw-policy p1
ServerIronADX(config-csw-p1)# match r1 forward 1
ServerIronADX(config-csw-p1)# match r1 hash-persist url complete
Syntax: [no] hash-persist url <method>
The <method> variable can be one of the following:
• complete
• path-only
• path-and-parameters - default value
• host-only
• host-and-path
For example, when a client tries to connect to http://login.yahoo.com/config/mail?.src=ym, the
http requests can come in two different ways:
- 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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