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    Configuring Network Elements

    A network element is a load-balanced cluster of RADIUS servers. In an authentication, authorization, and accounting (AAA) profile, you select network elements to be used for authentication and accounting. When the AAA profile is applied to an access point name (APN), mobile subscribers attempting to get network access through the APN receive authentication or accounting services from one of the servers in the network element.

    To configure a network element, you indicate the RADIUS servers that comprise it, optionally assign the servers a priority, and specify a load-balancing algorithm. You can also specify the maximum number of pending RADIUS requests that can be queued to the network element.

    To configure a network element:

    1. Specify the RADIUS servers that make up the network element.
      [edit access radius network-elements network-element-name]user@host# set server radius01
    2. (Optional) Set the load-balancing algorithm for the network element. You can specify either direct or round-robin. The direct algorithm causes all requests to go to the first server configured in the network element; if that server cannot handle any additional requests (that is, the server is marked “dead”), they go to the next server in the list. The round-robin algorithm sends the first request to the first server in the list, the second request to the second server in the list, and so on; if a server is marked dead, it is removed from the round-robin selection rotation for the duration of the revert-interval.
      [edit access radius network-elements network-element-name]user@host# set algorithm round-robin
    3. (Optional) Assign the RADIUS servers in the network element a priority of 1 or 2. The priority number is used for failover in case of server failure. The priority 2 servers are not used unless all the priority 1 servers fail. If all the priority 1 servers fail, then the broadband gateway starts using the priority 2 servers.
      [edit access radius network-elements network-element-name server server-name]user@host# set priority 1
    4. (Optional) Specify the maximum number of requests that can be queued to the network element. When the pending request queue is full, any additional requests are dropped. If the number of pending requests reaches 80 percent of the maximum, an SNMP trap is generated. You can specify from 512 through 8192 for the pending request limit. The default is 8192.
      [edit access radius network-elements network-element-name]user@host# set maximum-pending-reqs-limit 4096

    Published: 2011-11-23