Allied Telesis SwitchBlade x3100 Series Manual page 446

Introduction
As mentioned in 4.6.3, the ringFlapTimer is needed to prevent unnecessary opening and closing of the Sec-
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ondary port when a link in the ring is flapping, and is started when the Master node moves into the failed
state. The master cannot come out of the failed state until the ringFlapTimer expires even if it detects that
the ring is complete. The ringFlapTimer defaults to zero. It is recommended that you set this to a non-zero
value. The actual value will depend on your specific network.
4.6.7.4 EPSR and VLAN Tunneling
For the VLAN tunneling feature to function properly, each customer VLAN must be configured in EPSR to pre-
vent a loop. This is only applicable to the local node, but it is necessary because line cards strip off the outer tag
so that the EPSR sees only the inner tag.
This also allows customers who do not use multiple domains to have the limit for VLANs per domain increased
to 512.
For the VLAN tunneling implementation, assigning VLANs one at a time could be too cumbersome, so the
VLANs can be added as a list.
4.6.8 EPSR Interoperability
Allied Telesis EPSR is based on RFC3619 - Extreme Networks'™ Ethernet Automatic Protection Switching
1
(EAPS) Version 1 whether as the Master or Transit node and can interoperate with Extreme Networks'
switches that also supports EAPS.
When Extreme is the master, ensure that the following configuration is completed on the Extreme EAPS mas-
ter switch:
config eaps name failtime expiry-action actionvalue
name is the domain name the Extreme is the master for and the actionvalue specifies the action taken by the
master when the failover timer expires. actionvalue can be either open-secondary-port or send-alert.
In order to ensure that the Extreme Networks' switch interoperates with the SBx3112, use the following com-
mand for configuring domains where Extreme is the master:
config eaps name failtime expiry-action open-secondary-port
Caution: DO NOT set the expiry-action in the above command to send-alert. If expiry-action is set to send-
alert, the Extreme master will not be fully interoperable, which can cause a segment of the ring to be
isolated under certain failure conditions.
4.6.9 Configuration Procedure
The following table shows the basic steps to configure a Master and Transit Node with:
1. Extreme Networks is a registered trademark of Extreme Networks, Inc. All Rights Reserved
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Software Reference for SwitchBlade x3100 Series Switches (Layer Two Switching)
Configuring EPSR