Troubleshooting Congestion; Diagnosing Congestion; Global Congestion - Cabletron Systems SmartCell 6A000 User Manual

Troubleshooting
Check whether BUS is connected.
5.
•
Use
show busclient
check end node configuration. If not registered, check MP signaling.
•
Use to turn off MP signaling on a per-ELAN basis.
set leselan
-
Do devices begin to register with the LES and BUS once MP signaling is turned off?
•
Check IISP routes to the switch containing the LES and BUS.
-
Are all IISP routes correct?
-
Does a new IISP route need to be added so devices can reach the LES and BUS?
If working through these questions does not solve the problem, contact Cabletron Systems Customer
6.
Service. (See Appendix C, "Technical Support." )
5.3

TROUBLESHOOTING CONGESTION

If the bandwidth of your SmartCell 6A000 begins to decrease, and if connections are being lost or packets are being
dropped at a high rate, it's possible that your switch is becoming congested. Congestion can occur on the port level,
the global switch level, or both levels.
If you suspect that your SmartCell 6A000 switch is congested, follow the steps outlined below to diagnose and resolve
the cause of congestion.
5.3.1

Diagnosing Congestion

Enter the
1.
show portstats
If cells are not being dropped on all ports, proceed to the "Port Congestion" section.
2.
If cells are being dropped on all ports, the indication is global congestion. Proceed to the "Global
3.
Congestion" section.
5.3.2

Global Congestion

Is the total cell drop rate equal to the Unknown VC cell drop rate?
1.
•
If yes, the switch is improperly set up. Check the switch configuration.
•
If no, this indicates global congestion. Continue.
Set the
2.
porttrafficcongestion
Allocation Guidelines" section. Has the congestion subsided?
•
If yes, you are done.
•
If no, continue.
3. Have you changed the EPD threshold?
•
If yes, replace it to the default setting. If congestion subsides, you are done.
•
If no, continue.
to check whether devices are registered with the BUS. If clients are registered,
command, and take the default of
values to those recommended in the "Class of Service Queue
Troubleshooting Congestion
.
all
SmartCell 6A000 User Guide 5-3