Configuring Switching
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S3300 Smart Managed Pro Switch
802.1AS
1
Note: The 802.1AS feature is only supported on a standalone S3300 switch.
Standalone here means that all four stack ports are running in
Ethernet mode.
The IEEE 802.1AS standard specifies the protocol and procedures used to ensure that the
QoS requirements are guaranteed for time-sensitive applications, such as audio and video.
The IEEE 1588 Precision Time Protocol (PTP) forms the basis of the IEEE 802.1AS
standard. PTP specifies a precise clock synchronization protocol that relies on time-stamped
packets. The PTP protocol is applicable to distributed systems consisting of one or more
nodes communicating over some set of communication media. The distribution of
synchronous time information is performed in a hierarchical manner with a grandmaster clock
at the root of the hierarchy. The grandmaster provides a common and precise time reference
for one or more directly-attached slave devices by periodically exchanging timing information.
In other words, all slave devices synchronize their clocks with the grandmaster clock. The
slave devices can, in-turn, act as master devices for further hierarchical layers of slave
devices.
From the 802.1AS link, you can access the following screens:
• 802.1AS Configuration
• 802.1AS (EAV) in a Stacking Environment
• 802.1AS Statistics
802.1AS Configuration
Use the 802.1AS Configuration screen to enable the 802.1AS mode on the switch and
configure local clock priorities. The 802.1AS feature calculates the time delay between
devices on a given link and maintains an accurate view of a network clock.The screen also
displays various global 802.1AS information.
To configure the global 802.1AS settings on the switch:
1. Select Switching > 802.1AS > Basic > 802.1AS Configuration.
2. Next to 802.1AS status, select Enable.
3. In the Local Clock Priority1 field, specify the Priority1 value of the local clock (this time-aware
bridge).
4. In the Local Clock Priority2 field, specify the Priority2 value of the local clock (this time-aware
bridge).
5. Click the Apply button.
1. The 802.1AS feature is available only with a valid license. To activate this feature, you must purchase a license.
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