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CHAPTER 6: SPANNING TREE
PARAMETER DESCRIPTION
Configuration Identification
Configuration Name: The name identifying the VLAN to MSTI mapping. Bridges must share the name and revision (see below), as well
as the VLAN-to-MSTI mapping configuration to share spanning trees for MSTI’s (Intra-region). The name can be up to 32 characters
long.
Configuration Revision: The revision of the MSTI configuration named above. This must be an integer between 0 and 65535.
MSTI Mapping
Instance: The bridge instance. The CIST is not available for explicit mapping, as it will receive the VLANs not explicitly mapped.
VLANs Mapped: The list of VLANs mapped to the MSTI. The VLANs can be given as a single (xx, xx being between 1 and 4094) VLAN,
or a range (xx-yy), each of which must be separated with comma and/or space. A VLAN can only be mapped to one MSTI. An unused
MSTI should just be left empty. (i.e., no VLANs mapped to it). Example: 2,5,20-40.
MSTI Priority: Controls the bridge priority. Lower numeric values have better priority. The bridge priority plus the MSTI instance
number, concatenated with the 6-byte MAC address of the switch forms a Bridge Identifier.
Buttons
Apply: Click to save changes.
Reset: Click to undo any changes made locally and revert to previously saved values.
MSTI Port: Click to configure the STP CIST Port Configuration.
FIGURE 6-4. STP CIST CONFIGURATION SCREEN
PARAMETER DESCRIPTION
Port: The switch port number of the logical STP port.
STP Enabled: Controls whether STP is enabled on this switch port. This field will be read only if Voice VLAN feature is enabled. The
Voice VLAN port mode will be read only if this field be Enabled.
Path Cost: Controls the path cost incurred by the port. The Auto setting will set the path cost as appropriate by the physical link speed,
using the 802.1D recommended values. Using the Specific setting, a user-defined value can be entered. The path cost is used when
establishing the active topology of the network. Lower path cost ports are chosen as forwarding ports in favor of higher path cost
ports. Valid values are in the range 1 to 200000000.