Ethernet Automatic Protection Switching
ExtremeWare XOS 11.3 Concepts Guide
406
Configuring the Primary and Secondary Ports
Each node on the ring connects to the ring through two ring ports. As part of the protection switching
scheme, one port must be configured as the primary port, and the other must be configured as the
secondary port.
If the ring is complete, the master node prevents a loop by logically blocking all data traffic in the
transmit and receive directions on its secondary port. If the master node subsequently detects a break in
the ring, it unblocks its secondary port and allows data traffic to be transmitted and received through it.
To configure a node port as primary or secondary, use the following command:
configure eaps <name> [primary | sec
ondary] port
<ports>
The following command example adds port 1 of the module installed in slot 8 of the switch to the EAPS
domain “eaps_1” as the primary port.
configure eaps eaps_1 primary port 8:1
Configuring the EAPS Control VLAN
You must configure one control VLAN for each EAPS domain. The control VLAN is used only to send
and receive EAPS messages.
NOTE
A control VLAN cannot belong to more than one EAPS domain. If the domain is active, you cannot delete the
domain or modify the configuration of the control VLAN.
To configure the EAPS control VLAN for the domain, use the following command:
configure eaps <name> add control vlan <vlan_name>
NOTE
The control VLAN must NOT be configured with an IP address. In addition, only ring ports may be added to this
control VLAN. No other ports can be members of this VLAN. Failure to observe these restrictions can result in a loop
in the network.
NOTE
The ring ports of the control VLAN must be tagged.
The control VLAN with a QoS profile of QP8 (with the QoS profile HighHi priority setting) ensures that
the EAPS control VLAN traffic is serviced before any other traffic and that control VLAN messages
reach their intended destinations.
Because the QoS profile
HighHi priority setting by itself should ensure that the control VLAN traffic
gets through a congested port first, you should not need to set the QoS profile minimum bandwidth
(
minbw) or maximum bandwidth (maxbw) settings. However, if you plan to use QoS (profile priority and
bandwidth settings) for other traffic, you might need to set a
minbw value on QP8 for control VLAN
traffic. Whether you need to do this depends entirely on your configuration.
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