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802.1w Rapid Spanning Tree Protocol (RSTP) 802.1d Spanning Tree Protocol (STP)
802.1p Spanning-Tree Protocol (STP)
In figure 13-19:
• Port A1 and Trk1 (trunk 1; formed from ports 2 and 3) are redundant
fast-uplink STP links, with trunk 1 forwarding (the active link) and
port A1 blocking (the backup link). (To view the configuration for port
A1 and Trk1, see figure
13-17 on page 13-35.)
• If the link provided by trunk 1 fails (on both ports), then port A1 begins
forwarding in fast-uplink STP mode.
• Ports A5, A6, and A24 are connected to end nodes and do not form
redundant links.
CLI: Viewing and Configuring Fast-Uplink STP
Using the CLI to View Fast-Uplink STP. You can view fast-uplink STP
using the same
show commands that you would use for standard STP opera-
tion:
Syntax: show spanning-tree Lists STP status.
show spanning-tree config Lists STP configuration for the switch
and for individual ports.
For example, figures 13-20 and 13-21 illustrate a possible topology, STP status
listing, and STP configuration for a Series 5300XL switch with:
STP enabled and the switch operating as an Edge switch
Port A1 and trunk 1 (Trk1) configured for fast-uplink STP operation
Several other ports connected to PC or workstation end nodes
Series
5300XL
switch
Operating
as an Edge
Switch
Interior
Switch
with STP
Enabled
STP
Root
Device
Port
Trunk
STP
Block
LAN
Figure 13-20. Example Topology for the Listing Shown in Figure 13-21
13-37