XG700 User's Guide
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All Rights Reserved, Copyright (C) PFU LIMITED 2005-2006
5.6.5 bridge jumbo-frame
Function
Sets the maximum frame size of the jumbo frame. The maximum frame size that can be forwarded is 15360 byte.
Use the no form to return to the default setup.
Prompt
xg(config)#
Command syntax
bridge jumbo-frame [ { 9216 | 12288 | 15360 } ]
no bridge jumbo-frame
Parameter
jumbo-frame [ { 9216 | 12288 | 15360 } ]
Specifies the maximum frame size of the jumbo frame.
−
9216
Sets the permitted jumbo frame size to 9216 byte.
−
12288
Sets the permitted jumbo frame size to 12288 byte.
−
15360
Sets the permitted jumbo frame size to 15360 byte.
When this parameter is omitted, 9216 is specified.
Command type
Configuration command
Default
None
Message
% Flowcontrol was changed to only-receive.
Explanation
When 15360 bytes is specified to the maximum frame size of the jumbo frame, Flow Control of every switch port
has been changed to "only-receive" (Flow Control is valid only in receiving).
Solution
When the setting of Flow Control is used in "send-receive," set the jumbo frame to other than 15360.
Note
On forwardable frame size
The forwardable frame size when Jumbo Frame Forwarding is disabled is as follows:
Frame status
Forwardable frame size
VLAN-untagged 1518
bytes
VLAN-tagged 1522
bytes
User VLAN + VLAN-tagged
1526 bytes
When Jumbo Frame Forwarding is permitted, the forwardable frame size will include the sizes of VLAN tag and user
VLAN tag.
When the settings of Jumbo Frame Forwarding is changed, link down will occur at every port. Therefore, if the
spanning tree is active, STP State will be in the state of Discard. And as Rx signals are optimized, it takes about 15
seconds to become link up again.
When the settings of Jumbo Frame Forwarding is changed, statistical values will be cleared. Therefore, if this
command is executed while the monitor command is being executed, the statistics of the monitor command will
temporarily show unusual values. In that case, either wait for the next automatic update time of the statistics, or
execute the monitor command again.
When the jumbo frame size is set to 15360 bytes, Flow Control setting of every port will be "only-receive" (only
receiving is enabled).
Violation due to port security, loop back alert, and storm control will be cleared.
Example
Set Jumbo Frame to permit up to 9216 bytes.
xg(config)# bridge jumbo-frame 9216