Cabletron Systems SmartSwitch 04-0053-01 User Manual

Also see for SmartSwitch 9A100: User guide Upgrade instructions Installation and setup guide

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Cabletron Systems SmartSwitch 04-0053-01 User Manual Manual pdf 111 page image

SmartSwitch ATM User Guide 9-5Troubleshooting Troubleshooting Congestion*Use the show portconfig command to view bandwidth utilization3. Has the congestion subsided?• If yes, you are done.• If no, continue.4. Have you changed the EPD threshold (set switchtrafficcongestion command)?• If yes, replace it to the default setting. If congestion subsides, you are done.• If no, continue.5. Enter the show cacinfo and show portconfig commands for each port. Is the allocated bandwidthsmall and is the traffic mostly UBR?• If no, go back to step 4 and check next port.• If yes, continue.6. Enter the show porttrafficcongestion command. Is the UBR queue MaxValue large?• If no, go back to step 4.• If yes, continue.7. Reduce the UBR queue MaxValue by a small amount, then wait a few minutes.8. Enter the show portstats command, and take the default of all. Is the number of cells droppedincreasing for this port, and quickly decreasing for all other ports?• If yes, proceed to the “Port Congestion” section.• If no, continue.9. Is the number of cells being dropped by all other ports decreasing somewhat?• If no, go back to step 6.• If yes, continue.10. Enter the set caceqbwallocscheme command and set call admission control for this port to a moreconservative policy (moderate or conservative).11. Go back to step 4 until all ports have been checked.9.4.3 Port Congestion1. Enter the show portstats command a few times, noting the value for cells dropped and unknownVCs dropped. Is the number of cells dropped equal to the number of VCs dropped?rt-VBR Bandwidth* utilization less than 20%: Min = 16, Max = 1024rt-VBR Bandwidth* utilization greater than 20%: Min = 128, Max = 4096Nrt-VBR Min = 256, Max = 4096UBR Min = 256, Max = 8192ABR Min = 256, Max = 8192Table 9-1 Settings for Class of Service Queues (Continued)Service Class Recommended Settings