Huawei AR150 Series Configuration Manual page 120

Huawei AR150&200&1200&2200&3200 Series Enterprise
Routers
Configuration Guide - Device Management
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NOTE
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
ntp-service kod-enable
The KOD function is enabled.
By default, the KOD function is disabled.
Step 3 Configure the basic ACL.
Before configuring the access control rights, you must create a basic ACL. For the creation
procedure, see "ACL Configuration" in the Huawei AR150&200&1200&2200&3200 Series
Enterprise Routers Configuration Guide-Security.
Step 4 Run:
ntp-service access limited { acl-number | ipv6 acl6-number }
Control on the rate of incoming NTP packets is enabled.
By default, control on the rate of incoming NTP packets is disabled.
NOTE
Step 5 Run:
ntp-service discard { min-interval min-interval-val | avg-interval avg-interval-
val }
The minimum inter-packet interval and the average inter-packet interval of NTP are configured.
By default, the minimum inter-packet interval of NTP is set to the first power of 2 in seconds,
namely, 2 seconds, and the average inter-packet interval of NTP is set to the fifth power of 2 in
seconds, namely, 32 seconds.
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Issue 05 (2014-01-16)
When receiving the kiss code DENY, the client terminates all connections with the server,
and stops sending packets to the server.
When receiving the kiss code RATE, the client immediately shortens a poll interval with
the server. Every time the kiss code RATE is received after the first shortening operation,
the poll interval is further shortened.
The KOD supports the unicast client/server mode, symmetric peer mode, and manycast mode.
The KOD only functions in NTPv4.
The following configuration is performed on the server.
Before enabling control on the rate of incoming NTP packets, check the ACL rule configuration. When
the ACL rule is deny, the server sends the kiss code DENY. When the ACL is permit and the rate of
incoming NTP packets reaches the upper threshold, the server sends the kiss code RATE.
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5 NTP Configuration
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