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DGS-3620 Series Layer 3 Managed Stackable Gigabit Switch Web UI Reference Guide
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Figure 4-117 NLB FDB Settings window
The fields that can be configured are described below:
Parameter
Description
VLAN Name
Click the radio button and enter the VLAN name of the NLB multicast FDB entry to
be created.
VID
Click the radio button and enter the VLAN by the VLAN ID.
MAC Address
Enter the MAC address of the NLB multicast FDB entry to be created.
Port
Choose the forwarding ports for the specified NLB multicast FDB entry.
None
– The port is not the forwarding port. Click the
All
button to select all the
ports.
Egress
- The port is the forwarding port. Click the
All
button to select all the ports.
Click the
Clear All
button to clear out all the information entered.
Click the
Apply
button to accept the changes made.
PTP
The Precision Time Protocol (PTP) system is able to synchronize the distributed clocks with an accuracy of less
than 1 microsecond via Ethernet networks for the very first time.
PTP is a technology that enables precise synchronization of clocks in systems. PTP is applicable to systems
communicating by local area networks supporting multicast messaging including Ethernet and UDP. PTP enables
heterogeneous systems that include clocks of various inherent precision, resolution and stability to synchronize to a
grandmaster clock.
The synchronization is divided into two processes. The Best Master Clock (BMC) algorithm determines the PTP
status (master/slave) of all local ports. The synchronization algorithm computes the clock offset between the master
and slave clock. There are two mechanisms, Delay Request-response Mechanism and Peer Delay Mechanism, for
measuring the propagation time of an event message.
The PTP system has three types of PTP devices, boundary clock, end-to-end transparent clock and peer-to-peer
transparent clock. Only boundary clock can participate in the selection of the best master clock.
PTP Global Settings
This window is used to configure the PTP function globally.
To view this window, click
L2 Features > PTP > PTP Global Settings
, as shown below:
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