Allied Telesis SwitchBlade x3100 Series User Manual

EPSR Configuration with UFO VLAN Introduction
4-171
Software Reference for SwitchBlade x3100 Series Switches (Layer Two Switching)
4.7.6 EPSR Configuration with UFO VLAN
FIGURE 4-22 Initial forwarding configuration of ring ports in an EPSR network
Figure 4-22 shows a configuration where the master node, Allied Telesis System A, has its port pointing
towards the network configured as upstream with the two ring ports configured as downstream. This is provi-
sioned using the SET VLAN command with the FORWARDING parameter. This is similar to the current imple-
mentation of configuring the layer 2 aggregating switch the same way when it is the root bridge according to the
STP protocol. In the EPSR ring using the EPSR protocol, the master node configuration is conceptually the
equivalent of it being a root bridge for this network
In each of the transit nodes, both the ring ports are configured using the SET VLAN INTERFACE command with
the
FORWARDING parameter set to EPSR. For EPSR, unlike an STP implementation where a port change event is
used to configure ports the receipt of the EPSR protocol message is used. The ring port uses a Health message
with the a state of Complete received by the transit switch to configured the upstream port with the other ring
port configured to be the downstream port
Note: To use EPSR functionality for the determination of the upstream and downstream port in the nodes
that make up the ring, the node which has the link to the network must be the master node.
= Data VLAN (V_80)
= Physical Link
A
D
= Devices
= Links
V_60
V_80
V_80
V_60
V_80 V_60
B
C
1
2
3
4
1
4
V_80
V_60
D
2.1
A
= Control VLAN (V_60)
= Data VLAN on Physical
Link 1 is blocked
0.1
1.2
1.1
0.2
1.1
0.1
0.2
1.1
PP
SP
Master
Node
Data VLAN is
unblocked
With Device A as the root, data VLAN
FORWARDING could be set at interfaces:
0.1 = DOWNSTREAM
1.1 = DOWNSTREAM
2.1 = PRIMARYUPSTREAM
For other devices, data VLAN has
FORWARDING set to EPSR for
dynamic state change
(Upstream to Downstream,
Downstream to Upstream)
To / From Network
EPSR_Topology_UFO

Allied Telesis SwitchBlade x3100 Series Specifications

General

Brand	Allied Telesis
Model	SwitchBlade x3100 Series
Category	Switch
Language	English