
Configuring Bridging Services
1-26 114060 Rev. A
Parameter: Bridge Priority
Default: 128
Range: 0 to 65535
Function: Combined with the Bridge MAC Address parameter, assigns a 64-bit
bridge ID to the router. This parameter supplies the most significant 16
bits of the bridge ID, while Bridge MAC Address supplies the remaining
(least significant) 48 bits.
The spanning tree uses the bridge ID to select the root bridge. In selecting
the root bridge, the spanning tree chooses the bridge with the lowest
bridge ID number. Thus, the lower the value you set for this parameter,
the more likely it is that the router will be selected as the root bridge.
Instructions: Enter a decimal value from 0 to 65535.
MIB Object ID: 1.3.6.1.4.1.18.3.5.1.2.1.5
Parameter: Bridge MAC Address
Default: Defaults to a unique MAC address that the router automatically creates
based on the router’s backplane ID.
Options: Any valid 48-bit MAC-level address
Function: Combined with the Bridge Priority parameter, assigns a 64-bit bridge ID
to the router. Bridge Priority supplies the most significant 16 bits of the
bridge ID, while this parameter supplies the remaining (least significant)
48 bits.
The spanning tree uses the bridge ID to select the root bridge. In selecting
the root bridge, the spanning tree chooses the bridge with the lowest
bridge ID number. Thus, the lower the setting of Bridge Priority, the more
likely it is that the router will be selected as the root bridge. In the event of
equal Bridge Priority values, the value of this parameter determines the
bridge’s priority.
Instructions: Enter a 48-bit MAC address expressed as a 12-digit hexadecimal value.
We recommend that you set this parameter to the MAC address of one of
the router’s spanning tree ports, preferably the one with the lowest
priority.
MIB Object ID: 1.3.6.1.4.1.18.3.5.1.2.1.5
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