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AT-S63 Management Software Features Guide
Section III: Snooping Protocols 193
Guidelines
The guidelines to EPSR snooping are:
The AT-9400 Switch can support up to sixteen control VLANs and so
up to sixteen EPSR instances.
The AT-9400 Switch can not be the master node of a ring.
EPSR snooping does not support the transit node unsolicited method
of fault notification.
The switch must be operating in the user-configure VLAN mode to
support the feature. EPSR snooping is not supported in the Multiple
VLAN mode or the 802.1Q-compliant Multiple VLAN mode.
The control VLAN must have exactly two ports. The only exception to
this rule is if the ports of the control VLAN are part of a static port trunk.
The ports, which must be tagged members of the VLAN, are used as
the ring’s ports of the EPSR instance.
The ports of the control VLAN and the data VLANs of an EPSR
instance cannot be running LACP, STP, or GARP.
The control VLAN cannot be part of another EPSR instance as either a
control or data VLAN.
EPSR snooping is only compatible with the EPSR feature on Allied
Telesis products.