3com 8807 ユーザーガイド
NTP Configuration
755
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The delay for a round trip of an NTP packet traveling between Switch A and B:
Delay= (T
Delay= (T
4
-T
1
) - (T
3
-T
2
).
■
Offset of Switch A clock relative to Switch B clock: offset= ( (T
2
-T
1
) + (T
4
-T
3
) ) /2.
In this way, Switch A uses the above-mentioned information to set the local clock
and synchronize it with the clock on Switch B.
and synchronize it with the clock on Switch B.
The operating principle of NTP is briefly introduced above. For details, refer to
RFC1305.
RFC1305.
NTP Configuration
NTP is used for time synchronization throughout a network. The following sections
describe the NTP configuration tasks.
describe the NTP configuration tasks.
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Configuring NTP
Operating Mode
You can set the NTP operating mode of a Switch according to its location in the
network and the network structure. The following settings are for your reference:
network and the network structure. The following settings are for your reference:
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If you set a remote server as the time server of the local equipment, the local
Switch works as an NTP Client.
Switch works as an NTP Client.
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If you set a remote server as a peer of the local Switch, the local equipment
operates in Symmetric Active mode.
operates in Symmetric Active mode.
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If you configure an interface on the local Switch to transmit NTP broadcast
packets, the local Switch will operate in Broadcast mode.
packets, the local Switch will operate in Broadcast mode.
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If you configure an interface on the local Switch to receive NTP broadcast
packets, the local Switch will operate in Broadcast Client mode.
packets, the local Switch will operate in Broadcast Client mode.
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If you configure an interface on the local Switch to transmit NTP multicast
packets, the local Switch will operate in Multicast mode.
packets, the local Switch will operate in Multicast mode.
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If you configure an interface on the local Switch to receive NTP multicast
packets, the local Switch will operate in Multicast Client mode.
packets, the local Switch will operate in Multicast Client mode.
To configure NTP:
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Configure NTP server mode
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Configure NTP peer mode
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Configure NTP broadcast server mode
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Configure NTP broadcast client mode
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Configure NTP multicast server mode
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Configure NTP multicast client mode