Lucent Technologies P550 - Manual (Page 33)

Cajun P550 Switch Overview
Cajun P550/P220 Switch Operation Guide 1-13
Figure 1-8. Spanning Tree
Extensive Fault Tolerance
The Cajun P550 switch is designed as a backbone switch. You can install the switch in
your network’s core without creating a single point of failure.
Extensive fault tolerance features include:
❒ N+1 power. Power supplies share the power supply load. If a power supply fails,
the remaining supply or supplies assume the load automatically and the switch
management system warns you of the failure.
❒ Hot-swappable power supplies, fans, and modules - Each can be changed from the
switch front panel, without powering down the switch.
❒ Redundant switch links (using spanning tree and hunt groups).
❒ Front-loadable cables, modules, power, supplies and fans.
❒ Redundant switch matrix and switch controller modules.
Single 802.1D Spanning Tree
One Spanning Tree
Longer convergence
One path to and from root for all VLANs
Improper configuration
can shut down Trunk Links
Multi-Level Spanning Tree
Backbone terminates 802.1D STP
Smaller STP Domains
Quicker Convergence
VLAN Load Balancing
Interoperates w/ existing Bridge/Routers Multi-layer Spanning Tree