Enterasys Networks 2200 - Manual (Page 256)

Built-in Commands
11-20 Network Tools Screens
dynamic_egress
Description: Allows the dynamic egress control function to be enabled, disabled, or the
status viewed to see if the function is enabled or disabled. The command
requires a corresponding VID.
The dynamic egress control function allows or disallows VLANs to be
dynamically added to the dynamic Port VLAN Lists of a port.þ The default is
that no dynamic Port VLAN Lists will be modified.þThe lists are modified
based on the inbound traffic on a port.þ After a frame is classified into a
VLAN (via PVID, L2/L3/L4 classification, etc.), that VLAN is added to the
dynamic Port VLAN List of that port. The following three conditions must be
met before the VLAN is added to the dynamic Port VLAN List.
1. The feature is enabled for that VLAN.
2. The frame was not Q-tagged (priority tagged or untagged is okay).
3. The SmartSwitch device is not currently in STP blocking or listening on
that port.
After a VLAN has been added to the dynamic Port VLAN List, the entry is
subject to time out (age out) if the port does not receive another frame for that
VLAN within the aging time. The dynamic-egress aging time is equal to the
Spanning Tree ageing time (default is 300 seconds).
NOTE: Devices that do not source frames regularly (such as
printers), may not operate properly with dynamic egress enabled. In
these cases, it is recommended to manually create Port VLAN Lists.
For an example of how dynamic egress functions, refer to Section 11.3 .
Syntax: dynamic_egress [action] [vid]
Options: action:
status – Allows the status of the dynamic_egress function to be checked to
see if it is enabled or disabled.
enable – Allows dynamic egress modification for the vid.
disable – Disallows dynamic egress modification for the vid.
vid:
The VID of the VLAN to be acted on. The VLAN must be one that has been
configured in the switch before it can be selected. The range of VID value that
can be entered is from 1 through 4094.