System information

Troubleshooting LAN Switching Environments 22-455
LAN Switching: Catalyst 1600 Does Not Forward Source-Routed Frames
LAN Switching: Catalyst 1600 Does Not Forward Source-Routed Frames
Symptom: A Catalyst 1600 Token Ring switch fails to forward source-routed frames correctly.
Table 22-5 outlines the problems that might cause this symptom and describes solutions to those
problems.
Table 22-5 LAN Switching: Catalyst 1600 Does Not Forward Source-Routed Frames
Port ring speed
incorrect
Step 1 Make sure the port ring speed is correct for the ring connected to the port. The options
are 4 Mbps and 16 Mbps.
Step 2 Check the ring speed by reading the port LEDs or LCD panel.
Step 3 You can change the ring speed using the TrueView Catalyst 1600 Manager or by
connecting a terminal to the serial interface and using the set port ifspeed command.
Command: set port ifspeed port speed
Description: Sets the ring speed for the port to 4 or 16 Mbps.
Parameters: port Port number speed Ring speed (4 or 16)
For more information on setting the port ring speed, refer to the Catalyst 1600 Token Ring
Switch User Guide.
Possible
Problem Solution
Source routing not
enabled
Step 1 Check whether source routing is enabled on the Catalyst 1600 and on the appropriate
port. Check the status of source routing by reading the LCD panel.
Step 2 You can enable source routing on the Catalyst 1600 and on each port using the
TrueView Catalyst 1600 Manager or by connecting a terminal to the serial interface and
using the enable port srb command.
Command: enable port srb port
Description: Enables the forwarding of source-routed frames by the port.
Parameters: port Port number
Bridge number
misconfigured
Step 1 Check whether the bridge number of the Catalyst 1600 is a hexa- decimal number in the
range 0 through F and that there are no other devices with the same bridge number
connecting the same rings. Check the bridge number by reading the LCD panel.
Step 2 You can view the bridge number by using the TrueView Catalyst 1600 Manager or by
connecting a terminal to the serial interface and using the show bridge characteristics
command.
Example:
show bridge characteristics
Bridge Name: switch B
Bridge Number: 2
IP Address: 194.32.220.119
IP Subnet Mask: 255.255.255.0
Spanning Tree Root Priority: 40000
Possible
Problem Solution