Allied Telesis SwitchBlade x3100 Series Manual page 466

Introduction
= Physical Link
= Control VLAN (V_60)
= Data VLAN (V_80)
U
1
0.2
B
V_80 V_60
B
0.1
2
= physical link is blocked
by STP over Physical Link 8
= path costs set so will
3
never be blocked by STP
unless no other choice
EPSR_STP_Interop_60
Note: The Multiple Spanning Tree Protocol (MSTP) is also available (refer to Section 4.5). However,
implementing MSTP and EPSR features on the same system is not recommended, and so is
explained separately.
4-146
Software Reference for SwitchBlade x3100 Series Switches (Layer Two Switching)
To / From Network
0.3
V_80
A
V_60
D = Devices in EPSR topology
A
C G = Devices in RSTP topology
= Links
8
1
= Upstream (by UCP)
= Downstream (by UCP)
Master Node
V_60
PP
C
V_80
0.3
0.1
V_80
0.2
Possible EPSR/RSTP Configurations
FIGURE 4-17
EPSR and (R)STP Interaction
Root
Bridge
= data VLAN is blocked
over Physical Link 3 (SP)
4
V_60
3
SP
6
0.1
V_80
D
0.2
8
0.1
V_80
0.2
7
0.1
F
V_80