13-37
802.1w Rapid Spanning Tree Protocol (RSTP) and 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 Switch 2650 or Switch 6108 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
Figure 13-20. Example Topology for the Listing Shown in Figure 13-21
Switch
2650 or
6108
Operating
as an Edge
Switch
Interior
Switch
with STP
Enabled
STP
Root
Device
Port
Trunk
STP
Block
LAN
!Software.book Page 37 Thursday, October 10, 2002 6:10 PM
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