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82 ServerIron ADX Advanced Server Load Balancing Guide
53-1002435-01
Traffic Distribution based on Cache Server Capacity
2
ServerIronADX(config-tc-1)# hash-mask 255.255.255.255 0.0.0.0
ServerIronADX(config-tc-1)# cache-name cs100
ServerIronADX(config-tc-1)# predictor snmp-weighted oid 1
Syntax: [no] predictor snmp-weighted oid <oid-index>
The <oid-index> variable specifies the index number for the SNMP object identifier that you want to
use for operating SNMP weighted load sharing for this cache group. This must be the same
identifier as that defined under the cache servers.
A typical flow for SNMP-based cache server load balancing would include the following.
1. ServerIron ADX sends periodic SNMP queries to the cache server.
2. ServerIron ADX sets the cache server state based on the reply it receives from the cache
server.
3. For an incoming connection, a hash is computed based on its load state.
* In order to delete the existing connection on an offline/initializing cache server immediately
the server force-delete command needs to be configured.
** Overflow connections indicates that the connection that previously hashed to a cache
server that is currently either burdened, stressed, overloaded, overtaxed, halting or offline.
TABLE 7 Hash allocation and load balancing performed by ServerIron ADX based on the
load state of the cache server
Cache Server
state
Allocated has
bucket
New connections Overflow
Connections**
Existing
connections
Clears
hash-buckets
Underused Yes Allows Allows Allows No
Normal Yes Allows Allows Allows No
Burdened Yes Allows Allows Allows No
Stressed Yes Allows (If no other
cache is
available)
Does not allow Allows No
Overloaded/
overtaxed
Yes Does not allow Does not allow Allows No
Halting No Does not allow Does not allow Allows Yes
Offline No Does not allow Does not allow Deletes* Yes
Initializing Yes Does not allow Does not allow Deletes* No
- 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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