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13-8
Catalyst 2950 Desktop Switch Software Configuration Guide
78-14982-01
Chapter 13 Configuring Optional Spanning-Tree Features
Understanding Optional Spanning-Tree Features
Limitations
These limitations apply to CSUF:
• CSUF uses the GigaStack GBIC and runs on all Catalyst 3550 switches, all Catalyst 3500 XL
switches, Catalyst 2950 switches with GBIC module slots, and only on modular Catalyst 2900 XL
switches that have the 1000BASE-X module installed.
• Up to nine stack switches can be connected through their stack ports to the multidrop backbone.
Only one stack port per switch is supported.
• Each stack switch can be connected to the spanning-tree backbone through one uplink.
• If the stack consists of a mixture of Catalyst 3550, Catalyst 3500 XL, Catalyst 2950, and Catalyst
2900 XL switches, up to 64 VLANs with spanning tree enabled are supported. If the stack consists
of only Catalyst 3550 switches, up to 128 VLANs with spanning tree enabled are supported.
Connecting the Stack Ports
A fast transition occurs across the stack of switches if the multidrop backbone connections are a
continuous link from one GigaStack GBIC to another as shown in the top half of Figure 13-6. The
bottom half of Figure 13-6 shows how to connect the GigaStack GBIC to achieve a normal convergence
time.
You should follow these guidelines:
• A switch supports only one stack port.
• Do not connect alternate stack-root ports to stack ports.
• Connect all stack ports on the switch stack to the multidrop backbone.
• You can connect the open ports on the top and bottom GigaStack GBICs within the same stack to
form a redundant link.