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Reference Guide for the Centillion 50/100 and Model 5000BH Switches
1-36
893-01006-C
Creating Redundancy with the Centillion 50/100 and
Model 5000BH Switches
There are several ways to accomplish redundancy within a network of Centillion
50/100 or Model 5000BH switches. The switches may be used in combination to
achieve the necessary degree of redundancy. This section includes the following
redundancy implementations:
• Spanning tree redundancy (this page)
• PNNI and SVC/IISP redundancy and load balancing (this page)
• LANE services redundancy (page 1-37
)
• Circuit redundancy and load balancing (page 1-39
)
• Redundant MCP (page 1-39
)
Spanning Tree Redundancy
Redundant connections between VLANs can be accomplished with the Spanning
Tree Protocol. The Spanning Tree Protocol identifies and resolves redundant paths
in the network automatically. Only one path between two VLANs will be active at
any one time.
PNNI and SVC/IISP Redundancy and Load Balancing
In networks using PNNI, call balancing is automatically supported.
You can create redundant connections between LEC Circuit Saver or Turbo
virtual ports by using alternate-path routing for SVCs.
If an SVC between two LECs is broken, the LECs simply signal for another SVC.
This call may be set up over an entirely different path as configured in the IISP
routing tables for the switch. IISP defines the path over which a call request is
forwarded. The IISP route entry is statically configured and may incorporate
redundancy and the call balancing to a given destination.