A link can be a member of at most one bridge. So, if you want to move a link from one bridge instance to another bridge instance, you must first remove the link from the current bridge before adding it to another bridge.
Links that are assigned to the same bridge must have the same MTU value. Although you can change the MTU value on an existing link, the bridge instance goes into maintenance state until you remove or change the assigned links so that the MTU values match before you restart the bridge.
To add a new link to an existing bridge, use the following command:
# dladm add-bridge -l new-link bridge-name
The following example shows how to add the net2 link to the existing bridge rialto.
# dladm add-bridge -l net2 rialto