User's Manual

Configuration Guide of XGS-5240-Series
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ver is inconsistent. This will bring the accounting error. These phenomenons can bring t
he inconvenience to the operations and users.
The portal escaping function provides a good method to solve the above problems.
It can make the user on-line and use the network normally when the portal server or
radius server cannot working normally, and the new user can still access the network.
So the portal escaping includes portal server escaping and radius server escaping.
59.8.1 Portal Server Escaping
1.1.1.29 Introduction to Portal Server Escaping
The principle of portal server escaping function is that: switch probes the portal ser
ver periodically. If the probing is successful, the server status will be configured as UP;
if the probing failed N times (N can be configured), it will change the status of unreac
hable to be DOWN (escaping status), cancel the network authentication limit, allow the
portal user accessing the network without authentication and send the trap and log info
rmation of the status changing. When it probes the server is reachable, it will recover t
he server status to be UP (authentication status), restart the network authentication limit,
reject the user without authentication accessing the network and send the log and trap
information of the status recovering.
The method that switch probes the portal server status is probing the TCP connect
ion: switch launches the TCP connection to the portal server port of the portal server (t
he default is 2000, it can be configured) regularly. If the connection is successful, it me
ans that this portal server is enabled, we consider that the probing is successful and th
e server is reachable (the status is UP); if the connection failed, we consider the probi
ng failed.
Probing interval and maximum number of probing failures: the interval of the probin
g can be configured through the command. The maximum number of probing failures
means that the probing failures before that the server is reachable. One probing failure
does not mean that the server is unreachable; user should view if the number of the
probing failures achieves the configured maximum value. If the number achieves the co
nfigured value, the server can be considered as unreachable; otherwise, the number is
just cumulative. After probing is successful, this number will be cleared to be 0. The pr
obing interval and maximum number of probing failures can be configured through the
command.
The server triggers the following three configurations when the status changes from
reachable to unreachable, the administrator can select through the configuration: