System information

Troubleshooting LAN Switching Environments
Book Title
22-456
LAN Switching: Catalyst 1600 Does Not Forward Source-Route Broadcast
Frames
Symptom: A Catalyst 1600 Token Ring switch fails to forward source-route broadcast frames
correctly.
Table 22-6 outlines the problems that might cause this symptom and describes solutions to those
problems.
Table 22-6 LAN Switching: Catalyst 1600 Does Not Forward Source-Route Broadcast
Frames
LAN Switching: Poor Performance
Symptom: Connections across a LAN switch are slow or unreliable.
Table 22-7 outlines the problems that might cause this symptom and describes solutions to those
problems.
Table 22-7 LAN Switching: Poor Performance
Ring number
misconfigured
Step 1 Check the ring number of each Token Ring switch port and make sure each port has a
different ring number. Check the ring number by reading the LCD panel.
Step 2 If two Catalyst 1600 devices are connected by their Token Ring switch ports, make sure
the ring number is identical for both Token Ring ports.
Step 3 You can set the ring number using the TrueView Catalyst 1600 Manager, or by
connecting a terminal to the serial interface and using the set port segment command.
Command: set port segment port segment
Description: Sets the ring number.
Parameters: port Port number segment Ring number (001-FFF hexadecimal)
Possible
Problem Solution
VLAN
misconfigured
Step 1 Make sure that VLANs are configured correctly and that each Catalyst 1600 has an
up-to-date record of VLANs. To check the VLAN configuration, use the TrueView
Catalyst 1600 Manager.
Step 2 Before creating new VLANs, make sure you delete the existing VLANs that are causing
problems with forwarding source-route broadcast frames.
For detailed information on configuring VLANs, refer to the Catalyst 1600 Token Ring Switch
User Guide.
Station type
incorrect
Step 1 Check to make sure that the type of station connected to each Token Ring switch port is
defined correctly. The options are Workstations and Anything.
On Novell IPX and NetBIOS networks, the Catalyst 1600 uses the station type to block
broadcast frames originating on workstation-only rings from being forwarded on other
workstation-only rings.
Step 2 To configure the station type for each Token Ring switch port, use the TrueView
Catalyst 1600 Manager.
Possible
Problem Solution