Dell FCX624-S Laptop User Manual


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512 PowerConnect B-Series FCX Configuration Guide
53-1002266-01
Configuring GVRP
14
Disabling VLAN learning
To disable VLAN learning on a port enabled for GVRP, enter a command such as the following at the
GVRP configuration level.
PowerConnect(config-gvrp)#block-learning ethernet 6/24
This command disables learning of VLAN information on port 6/24.
NOTE
The port still advertises VLAN information unless you also disable VLAN advertising.
Syntax: [no] block-learning all | ethernet <port> [ethernet <port> | to <port>]
The all keyword disables VLAN learning on all ports enabled for GVRP.
ethernet <port> specifies a port. Specify the <port> variable in the following formats:
PowerConnect B-Series FCX stackable switches – <stack-unit/slotnum/portnum>
To specify a list of ports, enter each port as ethernet <port> followed by a space. For example,
ethernet 1/24 ethernet 6/24 ethernet 8/17
To specify a range of ports, enter the first port in the range as ethernet <port> followed by the last
port in the range. For example, ethernet 1/1 to 1/8.
You can combine lists and ranges in the same command. For example: enable ethernet 1/1 to 1/8
ethernet 1/24 ethernet 6/24 ethernet 8/17.
Changing the GVRP timers
GVRP uses the following timers:
Join – The maximum number of milliseconds (ms) a device GVRP interfaces wait before
sending VLAN advertisements on the interfaces. The actual interval between Join messages is
randomly calculated to a value between 0 and the maximum number of milliseconds specified
for Join messages. You can set the Join timer to a value from 200 – one third the value of the
Leave timer. The default is 200 ms.
Leave – The number of ms a GVRP interface waits after receiving a Leave message on the port
to remove the port from the VLAN indicated in the Leave message. If the port receives a Join
message before the Leave timer expires, GVRP keeps the port in the VLAN. Otherwise, the port
is removed from the VLAN. When a port receives a Leave message, the port GVRP state is
changed to Leaving. Once the Leave timer expires, the port GVRP state changes to Empty. You
can set the Leave timer to a value from three times the Join timer – one fifth the value of the
Leaveall timer. The default is 600 ms.
NOTE
When all ports in a dynamically created VLAN (one learned through GVRP) leave the VLAN, the
VLAN is immediately deleted from the device's VLAN database. However, this empty VLAN is
still maintained in the GVRP database for an amount of time equal to the following.
(number-of-GVRP-enabled-up-ports) * (2 * join-timer)
While the empty VLAN is in the GVRP database, the VLAN does not appear in the show vlans
display but does still appear in the show gvrp vlan all display.