Technical data

98 Brocade ServerIron ADX Advanced Server Load Balancing Guide
53-1003441-01
Traffic distribution based on cache server capacity
2
Configuring SNMP for cache server load
To configure SNMP-based cache server load balancing you must perform the following procedures:
• 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.
NOTE
This example shows commands that are valid on the ServerIron ADX device only when it is running
the Layer 3 router image.
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 three 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
HALTING (7):
Cache is in the process of shutting down.
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.
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 9 Load balancing action as determined by cache server state (Continued)
Cache server states ServerIron ADX load balancing action
ServerIronADX(config)#server cache-name cs100 10.20.20.100
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