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| Sun Ethernet Fabric Operating System ### LA Administration Guide

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## Set the MTU Value on one or More Ports

You can set the MTU value for an individual port or a set of ports by using the procedure in this section. In the following procedure, ports 0/1, 0/2, and 0/3 are part of the LA. When the MTU of a port in a bundle is different than the MTU for the port channel, the port will not be brought up in the bundle. See LA Topology Example for the topology referenced in this procedure.

1. Review the port state behavior with the default MTU settings for all of the ports.

       SEFOS# show interface mtu

       Ex0/1   MTU size is 1500
       Ex0/2   MTU size is 1500
       Ex0/3   MTU size is 1500
       Ex0/4   MTU size is 1500
       Ex0/5   MTU size is 1500
       Ex0/6   MTU size is 1500
       Ex0/7   MTU size is 1500
       Ex0/8   MTU size is 1500
       Ex0/9   MTU size is 1500
       Ex0/10  MTU size is 1500
       Ex0/11  MTU size is 1500
       Ex0/12  MTU size is 1500
       Ex0/13  MTU size is 1500
       Ex0/14  MTU size is 1500
       Ex0/15  MTU size is 1500
       Ex0/16  MTU size is 1500
       Ex0/17  MTU size is 1500
       Ex0/18  MTU size is 1500
       Ex0/19  MTU size is 1500
       Ex0/20  MTU size is 1500
       Ex0/21  MTU size is 1500
       Ex0/22  MTU size is 1500
       Ex0/23  MTU size is 1500
       Ex0/24  MTU size is 1500
       po1     MTU size is 1500
       vlan1   MTU size is 1500

2. Create the interface (0/1 in this example).

       SEFOS# configure terminal
       SEFOS(config)# interface extreme-ethernet 0/1
       SEFOS(config-if)# shutdown

3. Configure the MTU.

       SEFOS(config-if)# mtu 1000
       SEFOS(config-if)# no shutdown
       SEFOS(config-if)# end

4. Review the `etherchannel` information.

   The output has been truncated for readability.

       SEFOS# show etherchannel detail

       ...
                        Ports in the Group
                        ------------------
       Port : Ex0/1
       -------------
       Port State = Down, Not in Bundle
       Channel Group : 1
       Mode : Active
       ...

   Note - After you configure the MTU value on port 0/1 to 1000, note that because the MTU value on port 0/1 is different than the MTU value of the port channel interface, the `extreme-ethernet` port, 0/1, in switch A will be brought down and out of the bundle.

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