User's Manual

Table Of Contents
Users Manual of SGS-5240 Series Managed Switch
95
Designated Port The port priority and number of the port on the designated bridging device through which this switch
must communicate with the root of the Spanning Tree.
Oper Path Cost The contribution of this port to the path cost of paths towards the spanning tree root which include this
port.
Oper Link Type The operational point-to-point status of the LAN segment attached to this interface. This parameter is
determined by manual configuration or by auto-detection, as described for Admin Link Type in STA Port Configuration .
Oper Edge Port This parameter is initialized to the setting for Admin Edge Port in STA Port Configuration (i.e., true or
false), but will be set to false if a BPDU is received, indicating that another bridge is attached to this port.
Port Role Roles are assigned according to whether the port is part of the active topology, that is the best port
connecting a non-root bridge to the root bridge (i.e., root port), connecting a LAN through the bridge to the root bridge (i.e.,
designated port), is the MSTI regional root (i.e., master port), or is an alternate or backup port that may provide
connectivity if other bridges, bridge ports, or LANs fail or are removed. The role is set to disabled (i.e., disabled port) if a
port has no role within the spanning tree.
4.2.10.4 MSTP
Switch Management > STP > MSTP> MST List page is used to create an MSTP instance, or to add VLAN groups to an MSTP
instance.
To use multiple spanning trees:
1. Set the spanning tree type to MSTP .
2. Enter the spanning tree priority for the selected MST instance on the Spanning Tree > MSTP (MST List - New) page.
3. Add the VLANs that will share this MSTI on the Spanning Tree > MSTP > (MST List - New) page.
To ensure that the MSTI maintains connectivity across the network, you must configure a related set of bridges with the same
MSTI settings.
MST ID Instance identifier to configure. (Range: 0-4094)
VLAN ID VLAN to assign to this MST instance. (Range: 1-4093)
Priority The priority of a spanning tree instance. (Range: 0-61440 in steps of 4096; Options: 0, 4096, 8192, 12288, 16384,
20480, 24576, 28672, 32768, 36864, 40960, 45056, 49152, 53248, 57344, 61440; Default: 32768)