Disabling The Interface From Receiving Ntp Packets - Huawei Quidway S5700 Series Configuration Manual - Network Management

Quidway S5700 Series Ethernet Switches
Configuration Guide - Network Management
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4.3.7 Disabling the Interface From Receiving NTP Packets

To prevent a host on the LAN from synchronizing the clock on the specified server, you can
disable the specified interface on the host from receiving NTP packets.
Issue 01 (2011-10-26)
The system view is displayed.
2. Run:
vlan vlan-id
A VLAN is created and the VLAN view is displayed.
3. Run:
interface vlanif vlan-id
The interface that sends NTP multicast packets is specified.
4. Run:
ntp-service multicast-server [ ip-address ] [ authentication-keyid key-id
| ttl ttl-number | version number ] *
The local switch is set to be an NTP multicast server.
After the configurations, the local switch periodically sends clock synchronization
packets to the multicast address 224.0.1.1.
Configuring an NTP Multicast Client
Do as follows on the switch functioning as an NTP multicast client:
1. Run:
system-view
The system view is displayed.
2. (Optional) Run:
ntp-service max-dynamic-sessions number
The number of local sessions allowed to be set up dynamically is set.
3. Run:
vlan vlan-id
A VLAN is created and the VLAN view is displayed.
4. Run:
interface vlanif vlan-id
The interface that receives NTP multicast packets is specified.
5. Run:
ntp-service multicast-client [ ip-address ]
The local switch is set to be an NTP multicast client.
Step 2 is optional. By default, up to 100 NTP sessions can be set up dynamically.
After the configurations, the local switch senses the multicast NTP packets sent from
the server and synchronizes the local clock.
Running the ntp-service max-dynamic-sessions command does not affect the
existence of NTP sessions. When the number of the sessions reaches or exceeds the
maximum, the new session cannot be set up further.
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4 NTP Configuration
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