ZyXEL Communications ZyXEL Dimension ES-3024 - Manual (Page 55)

Dimension ES-3024 Ethernet Switch
General, Switch and IP Setup 5-7
Table 5-4 Switch Setup
LABEL DESCRIPTION EXAMPLE
Priority 4
Typically used for controlled load, latency-sensitive traffic such as SNA (Systems Network
Architecture) transactions.
Priority 3
Typically used for “excellent effort” or better than best effort and 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 from Queue 0 (for lower priority traffic) to Queue 3 (for higher priority traffic) from the drop-
down list boxes to map a queue for each traffic type.
Spanning Tree Protocol: Use STP to detect and disable network loops and provide backup links between switches,
bridges or routers.
Select Spanning Tree Protocol to enable STP on the switch. After configuring switch STP in this screen, you must
configure STP information for each port in the Port Setup screen.
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.
32768 (default)
Hello Time This is the time interval in seconds between BPDU (Bridge Protocol Data Units)
configuration message generations by the root switch. The allowed range is 1 to
10 seconds.
2 (default)
Max Age This is the maximum time (in seconds) a switch can wait without receiving a
BPDU before attempting to reconfigure. All switch ports (except for designated
ports) should receive BPDUs at regular intervals. Any port that ages out STP
information (provided in the last BPDU) becomes the designated port for the
attached LAN. If it is a root port, a new root port is selected from among the
switch ports attached to the network. The allowed range is 6 to 40 seconds.
20 (default)
Forwarding
Delay
This is the maximum time (in seconds) a switch will wait before changing states.
This delay is required because every switch must receive information about
topology changes before it starts to forward frames. In addition, each port needs
time to listen for conflicting information that would make it return to a blocking
state; otherwise, temporary data loops might result. The allowed range is 4 to 30
seconds. 15 (default)
Broadcast
Storm Control Use this field to limit the number of broadcast frames that can be stored in the
switch buffer or sent out from the switch. Broadcast frames that arrive when the
buffer is full are discarded. Enable Broadcast Storm Control to reduce
broadcast traffic coming into your network.