Configuring the Multicast Mode

This part describes how to configure the NTP multicast mode to synchronize clocks in a multicast domain.

Procedure

Configuring an NTP Multicast Server
Perform the following steps on the FW functioning as an NTP multicast server:
1. Access the system view.
```
system-view
```
2. Set the interface that sends multicast NTP packets.
```
interface interface-type interface-number
```
3. Configure the FW as an NTP multicast server on an IPv4 or IPv6 network.
  - ```
  ntp-service multicast-server [ ip-address ] [ [ authentication-keyid key-id | autokey ] | ttl ttl-number | version number | port port-number ] ^*
```
- ```
ntp-service multicast-server ipv6 [ ipv6-address ] [ [ authentication-keyid key-id | autokey ] | ttl ttl-number | port port-number ] ^*
```
  After the configuration is complete, the local FW periodically sends clock synchronization packets to the multicast address 224.0.1.1.
Configuring an NTP Multicast Client
Perform the following steps on the FW functioning as an NTP multicast client:
1. Access the system view.
```
system-view
```
2. Optional: Set the number of local sessions that can be set up dynamically.
```
ntp-service max-dynamic-sessions number
```
  By default, up to 100 NTP sessions can be set up dynamically.
  
  Running the 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.
3. Set the interface that receives multicast NTP packets.
```
interface interface-type interface-number
```
4. Configure the FW as an NTP multicast client on an IPv4 or IPv6 network.
  - ```
  ntp-service multicast-client [ ip-address ]
```
- ```
ntp-service multicast-client ipv6 [ ipv6-address ]
```
  After the configuration is complete, the local FW receives the multicast NTP packets sent from the server and synchronizes the local clock.