Disabling Backbonefast; Configuring Loop Guard; Enabling Loop Guard - Cisco WS-C2948G-GE-TX Configuration Manual

Configuring Loop Guard

----- -------- --------- -------- ---------- ----------
Total
BackboneFast statistics
-----------------------
Number of inferior BPDUs received (all VLANs)
Number of RLQ req PDUs received (all VLANs)
Number of RLQ res PDUs received (all VLANs)
Number of RLQ req PDUs transmitted (all VLANs) : 0
Number of RLQ res PDUs transmitted (all VLANs) : 0
Console> (enable)

Disabling BackboneFast

To disable BackboneFast on the switch, perform this task in privileged mode:
Task
Step 1
Disable BackboneFast on the switch.
Step 2 Verify that BackboneFast is disabled.
This example shows how to disable BackboneFast on the switch and verify the configuration:
Console> (enable) set spantree backbonefast disable
Backbonefast enabled for all VLANs
Console> (enable) show spantree backbonefast
Backbonefast is disabled.
Console> (enable)
Configuring Loop Guard
The following sections describe how to configure loop guard.

Enabling Loop Guard

Enter the set spantree guard command to enable spanning tree loop guard on a per-port basis. To set all
the ports on the switch, use the set spantree mst global-defaults loop-guard command.
To enable loop guard on an individual port, perform this task in privileged mode:
Task
Step 1
Enable loop guard on a port.
Step 2 Verify that loop guard is enabled.
This example shows how to enable loop guard on port 5/1:
Console> (enable) set spantree guard loop 5/1
Rootguard is enabled on port 5/1, enabling loopguard will disable rootguard on
this port.
Catalyst 4500 Series, Catalyst 2948G, Catalyst 2948G-GE-TX, and Catalyst 2980G Switches Software Configuration Guide—Release 8.2GLX
8-18
Chapter 8 Configuring Spanning Tree PortFast, BPDU Guard, BPDU Filter, UplinkFast, BackboneFast, and Loop Guard
Blocking Listening Learning Forwarding STP Active
0 0 0 1 1
: 0
: 0
: 0
Command
set spantree backbonefast disable
show spantree backbonefast
Command
set spantree guard {root | loop | none} mod/port
show spantree guard {mod/port | vlan} mistp-instance instance
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