Brocade Communications Systems ServerIron ADX 12.4.00 Service Manual Page 93
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ServerIron ADX Advanced Server Load Balancing Guide 81
53-1002435-01
Traffic Distribution based on Cache Server Capacity
2
Configuring SNMP-based Cache Server load balancing
To configure SNMP-based Cache Server load balancing you must do the following.
Within the cache server configuration:
• Set the SNMP request community string to the same as the cache server
• Set the SNMP request oid of the cache server
Within the cache group configuration
• Set the predictor to be SNMP weighted
The following configuration sets the SNMP request community string and oid.
Syntax: [no] snmp-request community <community-string>
The <community-string> variable specifies the community string name. The string can be up to 32
characters long.
Syntax: [no] snmp-request oid <oid-index> <oid-value>
The <oid-index> variable specifies an index number for the SNMP object identifier that you are
configuring.
The <oid-value> variable specifies the SNMP object identifier for the cache server.
By default, the ServerIron ADX polls the cache server for the configured oid every 3 seconds. To
change the SNMP poll interval, you can use the following command.
ServerIronADX(config)# server snmp-poll 30
Syntax: [no] server snmp-poll <seconds>
The <seconds> variable specifies the poll interval for the SNMP queries send by the ServerIron ADX
to the cache servers. The ServerIron ADX then sets the cache state based on the reply received
from the cache server.
The following configuration sets server cache group “1” to use the SNMP predictor configured with
the OID index “1” with the “cs100” cache server.
ServerIronADX(config)# server cache-group 1
OFFLINE (8):
Cache is out-of-service and unable to handle
any traffic.
The ServerIron ADX will neither allow any new connections
nor continue servicing existing connections on these
cache servers. Any new connections will instead be
forwarded to the under used and normal cache servers.
INITIALIZING (9):
Cache is preparing to enter service but not
ready to handle traffic.
The ServerIron ADX will not allow any new connections to
these cache servers.
TABLE 6 Load balancing action as determined by cache server state
Cache Server States ServerIron ADX load balancing action
ServerIronADX(config)# server cache-name cs100 20.20.20.100
ServerIronADX(config-rs-cs100)# snmp-request community public
ServerIronADX(config-rs-cs100)# snmp-request oid 1 1.3.6.1.4.1.14501.3.2.1.42.42.0
ServerIronADX(config-rs-cs100)# port http
ServerIronADX(config-rs-cs100)#exit
ServerIronADX(config)#
- 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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