Allied Telesis RAPIER I - Manual (Page 205)

Ethernet Protection Switching Ring (EPSR) 7
Configuring EPSR
EPSR can be configured in many ways ranging from the simple example
shown below, through to complex rings with extended lobes running either
EPSR or spanning tree protocols.
Single Domain, Single Ring Network
This example shows a very simple single ring, single domain configuration
with no connecting lobes.
Figure 1-3: EPSR Single Domain, Single Ring Network
Master
Node
Other
Ports
Other
Ports
Other
Ports
Control VLAN (control_ring)
Transit
Node 3
Transit
Node 1
Transit
Node 2
EPSR 3.eps
P S
Date VLAN (data_ring)
Other
Ports
Port 1
Primary Port 2
Secondary
Co
nt
ro
l V
LA
N
D
at
a
V
LA
N
Con
tro
l V
LA
N
D
at
a V
LA
N
VID = 2
VID = 100