The following examples show load balancing enabled for a named RADIUS server group. These examples are shown in three parts:
the current configuration of the RADIUS command output, debug output, and authentication, authorization, and accounting (AAA)
server status information.
The following sample output shows the relevant RADIUS configuration:
Device# show running-config
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aaa group server radius server-group1
server 192.0.2.238 auth-port 2095 acct-port 2096
server 192.0.2.238 auth-port 2015 acct-port 2016
load-balance method least-outstanding batch-size 5
!
aaa authentication ppp default group server-group1
aaa accounting network default start-stop group server-group1
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The lines in the current configuration of the preceding RADIUS command output are defined as follows:
-
The
aaa
group
server
radius command shows the configuration of a server group with two member servers.
-
The
load-balance command enables load balancing for global RADIUS server groups with the batch size specified.
-
The
aaa
authentication
ppp command authenticates all PPP users using RADIUS.
-
The
aaa
accounting command enables sending of all accounting requests to the AAA server when the client is authenticated and then disconnected
using the
start-stop keyword.
The show debug sample output below shows the selection of the preferred server and the processing of requests for the preceding
configuration:
Device# show debug
*Feb 28 13:51:16.019:AAA/SG/SERVER_SELECT(0000002C):No preferred server available.
*Feb 28 13:51:16.019:AAA/SG/SERVER_SELECT:Obtaining least loaded server.
*Feb 28 13:51:16.019:AAA/SG/SERVER_SELECT:No more transactions in batch. Obtaining a new server.
*Feb 28 13:51:16.019:AAA/SG/SERVER_SELECT:Obtaining a new least loaded server.
*Feb 28 13:51:16.019:AAA/SG/SERVER_SELECT:Server[0] load:0
*Feb 28 13:51:16.019:AAA/SG/SERVER_SELECT:Server[1] load:0
*Feb 28 13:51:16.019:AAA/SG/SERVER_SELECT:Selected Server[0] with load 0
*Feb 28 13:51:16.019:AAA/SG/SERVER_SELECT:[5] transactions remaining in batch.
*Feb 28 13:51:16.019:AAA/SG/SERVER_SELECT(0000002C):Server (192.0.2.238:2095,2096) now being used as preferred server
*Feb 28 13:51:16.019:AAA/SG/SERVER_SELECT(0000002D):No preferred server available.
*Feb 28 13:51:16.019:AAA/SG/SERVER_SELECT:Obtaining least loaded server.
*Feb 28 13:51:16.019:AAA/SG/SERVER_SELECT:[4] transactions remaining in batch. Reusing server.
*Feb 28 13:51:16.019:AAA/SG/SERVER_SELECT(0000002D):Server (192.0.2.238:2095,2096) now being used as preferred server
*Feb 28 13:51:16.019:AAA/SG/SERVER_SELECT(0000002E):No preferred server available.
*Feb 28 13:51:16.019:AAA/SG/SERVER_SELECT:Obtaining least loaded server.
*Feb 28 13:51:16.019:AAA/SG/SERVER_SELECT:[3] transactions remaining in batch. Reusing server.
*Feb 28 13:51:16.019:AAA/SG/SERVER_SELECT(0000002E):Server (192.0.2.238:2095,2096) now being used as preferred server
*Feb 28 13:51:16.019:AAA/SG/SERVER_SELECT(0000002F):No preferred server available.
*Feb 28 13:51:16.019:AAA/SG/SERVER_SELECT:Obtaining least loaded server.
*Feb 28 13:51:16.019:AAA/SG/SERVER_SELECT:[2] transactions remaining in batch. Reusing server.
*Feb 28 13:51:16.019:AAA/SG/SERVER_SELECT(0000002F):Server (192.0.2.238:2095,2096) now being used as preferred server
*Feb 28 13:51:16.019:AAA/SG/SERVER_SELECT(00000030):No preferred server available.
*Feb 28 13:51:16.019:AAA/SG/SERVER_SELECT:Obtaining least loaded server.
*Feb 28 13:51:16.019:AAA/SG/SERVER_SELECT:[1] transactions remaining in batch. Reusing server.
*Feb 28 13:51:16.019:AAA/SG/SERVER_SELECT(00000030):Server (192.0.2.238:2095,2096) now being used as preferred server
*Feb 28 13:51:16.023:AAA/SG/SERVER_SELECT(00000031):No preferred server available.
*Feb 28 13:51:16.023:AAA/SG/SERVER_SELECT:Obtaining least loaded server.
*Feb 28 13:51:16.023:AAA/SG/SERVER_SELECT:No more transactions in batch. Obtaining a new server.
*Feb 28 13:51:16.023:AAA/SG/SERVER_SELECT:Obtaining a new least loaded server.
*Feb 28 13:51:16.023:AAA/SG/SERVER_SELECT:Server[1] load:0
*Feb 28 13:51:16.023:AAA/SG/SERVER_SELECT:Server[0] load:5
*Feb 28 13:51:16.023:AAA/SG/SERVER_SELECT:Selected Server[1] with load 0
*Feb 28 13:51:16.023:AAA/SG/SERVER_SELECT:[5] transactions remaining in batch.
*Feb 28 13:51:16.023:AAA/SG/SERVER_SELECT(00000031):Server (192.0.2.238:2015,2016) now being used as preferred server
*Feb 28 13:51:16.023:AAA/SG/SERVER_SELECT(00000032):No preferred server available.
*Feb 28 13:51:16.023:AAA/SG/SERVER_SELECT:Obtaining least loaded server.
*Feb 28 13:51:16.023:AAA/SG/SERVER_SELECT:[4] transactions remaining in batch. Reusing server.
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The following sample output from the
show aaa servers command shows the AAA server status for the named RADIUS server group configuration:
The sample output shows the status of two RADIUS servers. Both servers are alive, and no requests have been processed since
the counters were cleared 0 minutes ago.
Device# show aaa servers
RADIUS:id 8, priority 1, host 192.0.2.238, auth-port 2095, acct-port 2096
State:current UP, duration 3781s, previous duration 0s
Dead:total time 0s, count 0
Quarantined:No
Authen:request 0, timeouts 0
Response:unexpected 0, server error 0, incorrect 0, time 0ms
Transaction:success 0, failure 0
Author:request 0, timeouts 0
Response:unexpected 0, server error 0, incorrect 0, time 0ms
Transaction:success 0, failure 0
Account:request 0, timeouts 0
Response:unexpected 0, server error 0, incorrect 0, time 0ms
Transaction:success 0, failure 0
Elapsed time since counters last cleared:0m
RADIUS:id 9, priority 2, host 192.0.2.238, auth-port 2015, acct-port 2016
State:current UP, duration 3781s, previous duration 0s
Dead:total time 0s, count 0
Quarantined:No
Authen:request 0, timeouts 0
Response:unexpected 0, server error 0, incorrect 0, time 0ms
Transaction:success 0, failure 0
Author:request 0, timeouts 0
Response:unexpected 0, server error 0, incorrect 0, time 0ms
Transaction:success 0, failure 0
Account:request 0, timeouts 0
Response:unexpected 0, server error 0, incorrect 0, time 0ms
Transaction:success 0, failure 0
Elapsed time since counters last cleared:0m