Configuring Access-Control Rights - 3Com Switch 4800G 24-Port Configuration Manual

Configuring the
Maximum Number of
Dynamic Sessions
Allowed
Configuring
Access-Control Rights
Configuration
Prerequisites
Configuration Procedure
To do...
Disable the interface from
receiving NTP messages
To do...
Enter system view
Configure the maximum
number of dynamic sessions
allowed to be established
locally
With the following command, you can configure the NTP service access-control
right to the local switch. There are four access-control rights, as follows:
query: control query permitted. This level of right permits the peer switch to
■
perform control query to the NTP service on the local switch but does not
permit the peer switch to synchronize its clock to the local switch. The so-called
"control query" refers to query of some states of the NTP service, including
alarm information, authentication status, clock source information, and so on.
synchronization: server access only. This level of right permits the peer switch
■
to synchronize its clock to the local switch but does not permit the peer switch
to perform control query.
server: server access and query permitted. This level of right permits the peer
■
switch to perform synchronization and control query to the local switch but
does not permit the local switch to synchronize its clock to the peer switch.
peer: full access. This level of right permits the peer switch to perform
■
synchronization and control query to the local switch and also permits the local
switch to synchronize its clock to the peer switch.
From the highest NTP service access-control right to the lowest one are peer,
server, synchronization, and query. When a switch receives an NTP request, it
will perform an access-control right match and will use the first matched right.
Prior to configuring the NTP service access-control right to the local switch, you
need to create and configure an ACL associated with the access-control right. For
the configuration of ACL, refer to "ACL Overview" on page 835.
Follow these steps to configure the NTP service access-control right to the local
switch:
To do...
Enter system view
Configure the NTP service
access-control right to the
local switch

Configuring Access-Control Rights

Use the command...
ntp-service in-interface
disable
Use the command...
system-view
ntp-service
max-dynamic-sessions
number
Use the command...
system-view
ntp-service access { peer |
query | server |
synchronization }
acl-number
957
Remarks
Required
An interface is enabled to
receive NTP messages by
default
Remarks
-
Required
100 by default
Remarks
-
Required
peer by default