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1-6
Chapter 1
Cajun P550/P880 Switch ATM Uplink User Guide, Version 1.1
Link Failover
* Note: This feature applies to LANE only.
In networks that do not support PNNI, you can use link failover as
an alternative to multiple active interfaces. With this feature, one
link is active with all other links designated as standby. If one link
loses its connectivity, a standby link becomes active and the
connections are re-established. Links are weighted to determine
which link attempts to take over first.
Spanning Tree
The Spanning Tree protocol is used to prevent loops from forming in
your network. The spanning tree algorithm creates a single path
through the network by ensuring that if more than one path exists
between two parts of a network, only one of these paths is used,
while the others are blocked. Because of the number of “bridges”
present in a switched networking environment, spanning tree
structures can become extremely complex. The ATM Uplink module
supports the spanning tree per VLAN option (each LEC has an
independent STP state).
* Note: The current version of the ATM Uplink module supports
only the spanning tree per VLAN option. Each VLAN
runs a separate spanning tree with its own Bridge
Protocol Data Units (BPDUs). This allows each LEC to
have a spanning tree state that is independent of the
other LECs on its module and does not support spanning
tree on RFC 1483 connections.
For more information on spanning tree support and configuration,
refer to the Cajun P550R/P880/P882 Switch User Guide.