ZyXEL Communications VES-1000 Series, Руководство пользователя, Страница: 117 / 227

VES-1000 Series Ethernet Switch
General, Switch and IP Setup 15-5
Table 15-4 Menu 2.2 - GARP Timer
FIELD DESCRIPTION EXAMPLE
Leave Timer
(msec) Leave Timer sets the duration of the Leave Period timer for GARP in
milliseconds. Each port has a single Leave Period timer. Leave Timer must be
at least two times larger than Join Timer ; the default is 600 milliseconds.
600
(default)
Leave All
Timer (msec) Leave All Timer sets the duration of the Leave All Period timer for GARP in
milliseconds. Each port has a single Leave All Period timer. Leave All Timer
must be larger than Leave Timer ; the default is 10,000 milliseconds.
10000
(default)
Once you have completed filling in Menu 2.2 — GARP Timer Setup , press [ENTER] at the message “Press
ENTER to Confirm… “ to save your configuration or press [ESC] at any time to cancel.
15.2.3 Quality of Service (QoS)
IEEE 802.1p defines up to 8 separate traffic classes by inserting a tag into a MAC-layer frame that contains bits to
define class of service.
Table 15-5 QoS Priority Listing
PRIORITY DESCRIPTION
Priority 7 Typically used for network control traffic such as router configuration messages.
Priority 6 Typically used for voice traffic that is especially sensitive to jitter (jitter is the variations in delay.
Priority 5 Typically used for video that consumes high bandwidth and is sensitive to jitter.
Priority 4 Typically used for controlled load, latency-sensitive traffic such as SNA transactions.
Priority 3 Typically used for better than best effort; would include important business traffic that can tolerate
some delay.
Priority 2 Typically used for best-effort traffic.
Priority 1 This is the default priority if none is specified.
Priority 0 Typically used for non-critical traffic such as backups, non-critical replications, some electronic mail
and so on.
The switch has 4 physical queues to support the 8 priority levels for each port. On the switch, traffic assigned to
higher index queues gets through faster while traffic in lower index queues is dropped if the network is congested.
You use menu 2.3 to map the priority levels to physical queues.
Frames without explicit priority is given the default priority of the ingress port. You can use menu 6.1 and 6.2 to
configure the default priority for each port.
To configure the priority level-to-physical queue mapping, select Yes in the Edit QoS Support field in menu 2 to
go to Menu 2.3 — QoS Setup . The following figure displays the default queues for each priority level.