Calculating packet loss on a routed PVC in Example 1
To calculate packet loss for a routed PVC configuration, perform these tasks.
- Display the values for INPKTS, InUcastPkts, and IN_FRAME_UNICAST on the ingress ATM port:
- The ingress SAR counter records the number of incoming packets -- INPKTS -- that arrive on the ingress ATM port. To display this number, in the CLI, enter this command:
| show port stats atmp <ingress atm port> |
- The ingress acceleration CPU counter (ACC CPU) records the number of unicast packets -- InUcastPkts -- received on the ingress port. To display this number, in the CLI, enter this command:
| show atm elan <elan number> |
- The ingress ATM ARU counter records the number of unicast packets -- IN_FRAME_UNICAST -- sent from the ingress ATM port to the egress ATM port through the switch fabric. To display this number, in the CLI, enter this command:
| show port stats routing <ingress atm port> |
- Display the values for OUT_FRAME, OutUcastPkts, and OUT_FRAME on the egress ATM port:
- The egress ATM ARU counter records the number of frames
-- OUT_FRAME -- that are received from the ingress ATM port. To display this number, in the CLI, enter this command:
| show port stats routing <egress atm port> |
- The egress ACC CPU counter records the number of unicast packets -- OutUcastPkts -- forwarded to the egress ATM port. To display this number, in the CLI, enter this command:
| show atm elan <elan number> |
- The egress SAR counter records the number of packets -- OUTPKTS -- sent out the egress ATM port. To display this number, in the CLI, enter this command:
| show port stats atmp <egress atm port> |
- The number of packets lost is the difference between the IN_FRAME_UNICAST value and the OUT_FRAME value.
