Cisco Catalyst 3750-X User Manual

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Catalyst 3750-X and 3560-X Switch Software Configuration Guide
OL-21521-01
Chapter 50 Configuring Fallback Bridging
Configuring Fallback Bridging
Note Each switch in a spanning tree adopts the interval between hello BPDUs, the forward delay interval, and
the maximum idle interval parameters of the root switch, regardless of what its individual configuration
might be.
Adjusting the Interval between Hello BPDUs
Beginning in privileged EXEC mode, follow these step to adjust the interval between hello BPDUs. This
procedure is optional.
To return to the default setting, use the no brid
ge bridge-group hello-time global configuration
command.
This example shows how to change the hello interval to 5 seconds in bridge group 10:
Switch(config)# bridge 10 hello-time 5
Changing the Forward-Delay Interval
The forward-delay interval is the amount of time spent listening for topology change information after
a port has been activated for switching and before forwarding actually begins.
Beginning in privileged EXEC mode, follow these steps to change the forward-delay interval. This
p
rocedure is optional.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
bridge bridge-group hello-time seconds Specify the interval between hello BPDUs.
• For bridge-group, specify the bridge group number. The range is 1
to 255.
• For seconds, enter a number from 1 to 10. The default is 2.
Step 3
end Return to privileged EXEC mode.
Step 4
show running-config Verify your entry.
Step 5
copy running-config startup-config (Optional) Save your entry in the configuration file.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
bridge bridge-group forward-time
seconds
Specify the forward-delay interval.
• For bridge-group, specify the bridge group number. The range is 1
to 255.
• For seconds, enter a number from 4 to 200. The default is 20.
Step 3
end Return to privileged EXEC mode.
Step 4
show running-config Verify your entry.
Step 5
copy running-config startup-config (Optional) Save your entry in the configuration file.

Cisco Catalyst 3750-X Specifications

General

Switching Capacity	160 Gbps
Stacking Bandwidth	64 Gbps
Max Stacking Units	9
Layer Support	Layer 2 and Layer 3
Form Factor	Rack-mountable
DRAM	256 MB
Flash Memory	64 MB
Model	Cisco Catalyst 3750-X Series
Ports	24 or 48 10/100/1000 Ethernet ports
Uplink Interfaces	4 SFP or 2 SFP+
Features	StackWise Plus, EnergyWise
Image	IP Base or IP Services
Operating Temperature	0 to 40°C
Operating Humidity	10 to 85% noncondensing