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Stackable NWay Ethernet Switch User’s Guide
Using the Console Interface 57
such as video or audio data, where latency can produce distorted sounds and images. Packets in the low
priority queue will not be processed unless the High priority queue is empty. Setting the port priority to
High
will deliver all packets arriving at the port to the high priority queue, a
Low
setting will send
them all to the low priority queue. The
Normal
setting causes the port to examine the packet for an
IEEE 802.1p/q priority tag. If no tag exists, the packet will be sent to the low priority queue. If the
priority tag field in the packet header contains a value of 0-3, the packet will be placed in the low
priority queue; a value of 4-7 causes the packet to be placed in the high priority queue.
♦
Port Lock
When
Enabled
, automatic learning for all stations connected to this port will stop and
entries in the Forwarding Table for all devices residing on this port will age out. The only traffic this
port will allow is traffic from machines whose MAC address is manually entered in the Static
Forwarding Table.
♦
Broadcast Storm
Rising Action
This setting will be activated when a Broadcast Storm Rising
Threshold is met. When triggered, the port can be configured to
Do Nothing
,
Blocking
or
Blocking-Trap
.
The
Do Nothing
setting causes the switch to operate normally, in other words, ignore the broadcast
storm condition. The
Blocking
setting causes the port to drop all broadcast frames, thus isolating the
broadcast storm.
Blocking-Trap
performs the same action as
Blocking
, except it also sends a trap to the
designated Trap Recipient informing them of the situation. For more information on broadcast storms,
please refer to the previous chapter.
♦
Broadcast Storm
Falling Action
This setting will be activated when the Broadcast Storm Rising
Threshold
and then the Broadcast Storm Falling Threshold
are
each
met. This setting can be configured
to
Do Nothing
,
Forwarding
or
Forwarding-Trap
. The
Do Nothing
setting causes the switch to operate
normally, that is, to ignore the situation. If the port had met the
Broadcast Storm Rising Action
criteria
and started
Blocking
broadcast packets, it will continue doing so. The
Forwarding
setting causes the
port to begin forwarding broadcast frames, thus removing the
Blocking
state imposed by the
Broadcast
Storm Rising Action
.
Forwarding-Trap
performs the same action as
Forwarding
, except it also sends a
trap to the designated Trap Recipient informing them of the situation.
Press CTRL+S to let the changes take effect. If you wish these changes to be the default for the switch,
return to the main menu and choose
Save Changes
.
STP Port State
(whether the Spanning Tree Protocol is enabled or disabled on this port) and
Status
reflect
the current conditions of the port. They are read-only fields and cannot be changed.
Configure Trunk
Ports on the Switch can be grouped together in a single logical port called a trunk. This is discussed in detail
in the
Port Trunking
section of the
“Switch Management Concepts”
chapter of this manual.
To set up a trunk group, choose
Configure Trunk
on the
System Configuration
menu. The following
screen appears: