Huawei AR3200 Series - Page 237

Port
Roles
Description
Regional
edge port
A regional edge port is located at the edge of an MST region and connects
to another MST region or an SST.
During MSTP calculation, the roles of a regional edge port in the MSTI and
the CIST instance are the same. If the regional edge port is the master port
in the CIST instance, it is the master port in all the MSTIs in the region.
As shown in Figure 8-5, AP1, DP2, and DP3 in an MST region are directly
connected to other regions, and therefore they are all regional edge ports of
the MST region.
As shown in Figure 8-5, AP1 is a regional edge port and also a master port
in the CIST. Therefore, AP1 is the master port in every MSTI in the MST
region.
Edge
port
An edge port is located at the edge of an MST region and does not connect
to any switching device.
Generally, edge ports are directly connected to terminals.
As shown in Figure 8-5, BP3 is an edge port.
Figure 8-5 Port roles
S1
AP2
S2
S3
AP3
CP2 CP3
BP2
CP1 BP1
S4
Root Bridge
MST Region
AP1
AP4
DP1
DP4
DP2
DP3
PC
Root port
Designated port
Alternate
port
Backup port
Master port
Edge port
Regional edge port
BP3
l Port status
Table 8-3 lists the MSTP port status, which is the same as the RSTP port status.
Huawei AR3200 Series Enterprise Routers
Configuration Guide - LAN 8 MSTP Configuration
Issue 02 (2012-03-30) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
226