Huawei AR3200 Series Configuration Manual - Lan page 237

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