HPE FlexFabric 5700 Series User Manual

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interface so that any interface status change on the device will not cause NTP messages to be
unable to be received.
When the device responds to an NTP request, the source IP address of the NTP response is always
the IP address of the interface that has received the NTP request.
Follow these guidelines when you specify the source interface for NTP messages:
• If you have specified the source interface for NTP messages in the ntp-service
unicast-server/ntp-service ipv6 unicast-server or ntp-service unicast-peer/ntp-service
ipv6 unicast-peer command, the specified interface acts as the source interface for NTP
messages.
• If you have configured the ntp-service broadcast-server or ntp-service
multicast-server/ntp-service ipv6 multicast-server command in an interface view, this
interface acts as the source interface for broadcast or multicast NTP messages.
To specify the source interface for NTP messages:
Step Command Remarks
1. Enter system view.
system-view
N/A
2. Specify the source interface
for NTP messages.
• Specify the source interface
for NTP messages:
ntp-service source
interface-type
interface-number
• Specify the source interface
for IPv6 NTP messages:
ntp-service ipv6 source
interface-type
interface-number
By default, no source interface is
specified for NTP messages.
Disabling an interface from receiving NTP messages
When NTP is enabled, all interfaces by default can receive NTP messages. For security purposes,
you can disable some of the interfaces from receiving NTP messages.
To disable an interface from receiving NTP messages:
Step Command Remarks
1. Enter system view.
system-view
N/A
2. Enter interface view.
interface
interface-type
interface-number
N/A
3. Disable the interface from
receiving NTP messages.
• For IPv4:
undo ntp-service inbound
enable
• For IPv6:
undo ntp-service ipv6
inbound enable
By default, an interface receives
NTP messages.
Configuring the maximum number of dynamic associations
NTP has the following types of associations:
• Static association—A manually created association.
• Dynamic association—Temporary association created by the system during NTP operation. A
dynamic association is removed if no messages are exchanged within about 12 minutes.

HPE FlexFabric 5700 Series Specifications

General

Product Line	HPE FlexFabric
Model	5700 Series
Power Supply	Redundant power supply options
Layer Support	Layer 2/3
Management	HPE Intelligent Management Center (IMC), CLI, SNMP
Routing Protocol	RIP, OSPF, BGP, IS-IS
Features	Virtualization
Compliant Standards	IEEE 802.1D, IEEE 802.1Q, IEEE 802.1w, IEEE 802.1s, IEEE 802.3ad, IEEE 802.3ae
Operating Temperature	32°F to 113°F (0°C to 45°C)
Operating Humidity	10% to 90% (noncondensing)
Latency	Less than 1 µs