ZyXEL Communications VES-1000 Series, Руководство пользователя, Страница: 47 / 227

VES-1000 Series Ethernet Switch
Getting Started Screens 5-7
Table 5-4 Switch Setup
LABEL DESCRIPTION
Join Timer Join Timer sets the duration of the Join Period timer for GVRP in milliseconds. Each port has
a Join Period timer. The allowed Join Time range is between 100 and 65535 milliseconds; the
default is 200 milliseconds.
Leave Timer Leave Timer sets the duration of the Leave Period timer for GVRP in milliseconds. Each port
has a single Leave Period timer. Leave Time must be two times larger than Join Timer; the
default is 600 milliseconds.
Leave All
Timer
Leave All Timer sets the duration of the Leave All Period timer for GVRP in milliseconds. Each
port has a single Leave All Period timer. Leave All Timer must be larger than Leave Timer; the
default is 1000 milliseconds.
Priority Queue Assignment
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. Frames without an explicit priority tag are given the default priority of the ingress port.
Use these fields to configure the priority level-to-physical queue mapping.
The switch has four physical queues that you can map to the 8 priority levels. 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.
Priority Level
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 This is for “spare bandwidth”.
Priority 1 This is typically used for non-critical “background” traffic such as bulk transfers
that are allowed but that should not affect other applications and users.
Priority 0 Typically used for best-effort traffic.
Queue Select 3 , 2 , 1 or 0 to set high or low priority traffic.
Spanning Tree
Protocol Select the check box to enable STP on the VES.
Bridge Priority Bridge priority is used in determining the root switch, root port and designated port. The switch
with the highest priority (lowest numeric value) becomes the STP root switch. If all switches
have the same priority, the switch with the lowest MAC address will then become the root
switch. The allowed range is 0 to 65535.
The lower the numeric value you assign, the higher the priority for this bridge.
Bridge Priority determines the root bridge, which in turn determines Hello Time , Max Age
and Forwarding Delay .