The Extended Task manager provides additional information on the ports on the 6401 Rugged Router
Port Number: Shows the xTM (ATM) Port number
In Octets: Number of received octets over the interface.
Out Octets: Number of transmitted octets over the interface.
In Packets: Number of received packets over the interface.
Out Packets: Number of transmitted packets over the interface.
In OAM Cells: Number of OAM cells received. . (Operational and Management)
Out OAM Cells: Number of OAM cells transmitted. (Operational and Management)
In ASM Cells: Number of ASM cells received. (Autonomous Status Messages)
Out ASM Cells: Number of ASM cells transmitted. (Autonomous Status Messages)
In Packet Errors: Number of received packets with errors.
In Cell Errors: Number of received cells with errors.
Reset: Click to reset the statistics.
OAM Cells
If a communication problem occurs on a PVC (no traffic going one way or the other), the permanent
virtual circuit (PVC) remains UP on the end-devices. Therefore, routing entries that were pointing to
that PVC remain in the routing table for a certain time and as a result, packets will be lost. The
solution to this problem is to use Operation and Maintenance (OAM) to detect such failures and allow
the PVC to disconnect if it is disrupted along its path. At regular intervals, end-devices (such as
routers) configured for OAM send loopback cells which must be looped in the network. This looping
point can be the machine at the end of the PVC (end-to-end loopback cells) or equipment on the path
(segment loopback cells)
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