The router interface metrics provide information about the network performance of the router interface.

Metric Name Metric API Name Description
Discarded Rx Packets net.discardedRx.delta.summation.number Number of discarded inbound packets.
Discarded Tx Packets net.discardedTx.delta.summation.number Number of discarded outbound packets.
Dropped Rx Packets net.droppedRx.delta.summation.number Number of received packets that were dropped during the collection interval.
Dropped Tx Packets net.droppedTx.delta.summation.number Number of transmitted packets that were dropped during the collection interval.
FCS Errors net.errorFcs.delta.summation.number Number of frames transmitted or received with a bad checksum (CRC value) in the Ethernet frame.

Frame check sequence errors indicate the frames of data corrupted during transmission. These frames are dropped and not propagated to other ports.

Giant Errors net.errorGiants.delta.summation.number Number of giant errors (errors caused by packet having size greater than MTU of the interface) over the network during the selected duration.
Interface Rx Utilization (%) net.rx.utilization.absolute.latest.percent Interface utilization percentage for the received traffic.
Interface Tx Utilization (%) net.tx.utilization.absolute.latest.percent Interface utilization percentage for the transmitted traffic.
Interface Utilization (%) net.utilization.absolute.latest.percent Interface utilization percentage for received and transmitted traffic.
Max Network Traffic Rate (kbps) net.usage.rate.maximum.kiloBytesPerSecond Maximum network usage rate over any five minute interval in the selected duration.
Max Network Tx Rate (kbps) net.transmitted.rate.maximum.kiloBytesPerSecond Maximum network data transmit rate over any five minute interval in the selected duration.
Max Packet Drop Ratio (%) net.packetDrop.ratio.maximum.percent Maximum five minute interval ratio of total dropped packets to total number of packets.
Max Packet Drops net.droppedTotal.delta.maximum.number Maximum number of dropped Rx and Tx packets over any five minute interval in the selected duration.
Multicast Rx Packets net.multicastRx.delta.summation.number Number of multicast packets received in the selected duration.
Multicast Tx Packets net.multicastTx.delta.summation.number Number of multicast packets transmitted in the selected duration.
Network Align Errors net.errorAlign.delta.summation.number Number of alignment errors detected over the network in the selected duration.

Network alignment errors occur if a frame arrives with part of an octet missing, and has an FCS error.

Network Carrier Sense Errors net.errorCarrierSense.delta.summation.number Number of carrier sense errors detected over the network in the selected duration.

Network carrier sense errors occur when an interface cannot transmit a frame because it did not detect a carrier.

Network Deferred Tx Errors net.errorDeferredTx.delta.summation.number Number of deferred transmission errors detected over the network in the selected duration.
Network Excessive Collision Errors net.errorExcessiveCollisions.delta.summation.number

Number of excessive collision errors detected over the network in the selected duration.

Network excessive collision errors occur when a station receives 16 consecutive collisions while attempting to transmit a single frame. In such a situation, the frame is dropped due to the excessive collisions.

Network Late Collision Errors net.errorLateCollisions.delta.summation.number Number of late collision errors detected over the network in the selected duration.
Network Long Frame Errors net.errorFrameTooLongs.delta.summation.number Number of network long frame errors detected over the network in the selected duration.
Network Max Rx Rate net.received.rate.maximum.kiloBytesPerSecond The maximum rate at which the data is received during the time interval.
Network Multi Collision Errors net.errorMultiCollisionFrames.delta.summation.number Number of multi collision errors detected over the network in the selected duration.
Network Packet Count net.packetsTotal.delta.summation.number Total number of packets transmitted and received during the time interval.
Network Packet Drop Percent net.packetDrop.ratio.average.percent Average ratio of total number of dropped packets to total number of packets.
Network Packet Drops net.droppedTotal.delta.summation.number Total number of packets dropped during the time interval.
Network Receive Errors net.errorRcv.delta.summation.number Number of receive errors received on the physical interface in the selected duration.

Receive errors occur when there is excessive output rates of traffic, or if the receive buffer is full.

Network Rx Int Mac Errors net.errorRxIntMac.delta.summation.number Number of frames for which reception on a particular interface has failed due to an internal MAC sublayer receive error.
Network Rx Rate net.received.rate.average.kiloBytesPerSecond Average rate at which data is received during the time interval.
Network Single Collision Errors net.errorSingleCollisionFrames.delta.summation.number Number of single collision errors detected over the network in the selected duration.
Network SQE Test Errors net.errorSQETests.delta.summation.number Number of signal quality test errors detected over the network in the selected duration.
Network Symbol Errors net.errorSymbol.delta.summation.number Number of symbol errors detected over the network in the selected duration.
Network Traffic Rate net.usage.rate.average.kiloBytesPerSecond Average rate of received and transmitted traffic during the time interval.
Network Tx Intmac Errors net.errorTxIntMac.delta.summation.number Number of frames for which transmission on a particular interface failed due to an internal MAC sublayer transmit error.
Network Tx Rate net.transmitted.rate.average.kiloBytesPerSecond Average rate of transmitted traffic during the time interval.
Network Undersize Errors net.errorUnderSize.delta.summation.number Number of undersize errors detected over the network in the selected duration.

Undersize errors indicate bad frames generated by connected devices.

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Network Xmit Errors net.errorXmit.delta.summation.number Number of transmit errors detected over the network in the selected duration.

Xmit errors occur when there is excess input rates of traffic, or if the transmit buffer is full.

To minimize the occurrence of this error, you must increase the speed of the interface and move the link partner to full-duplex.

Out Queue Length net.outQLen.absolute.average.number Number of output packets waiting in the queue.
Rx Broadcast Packets net.broadcastRx.delta.summation.number Number of broadcast packets received during the time interval.
Rx Broadcast Ratio (%) net.broadcastByRx.ratio.average.percent Percentage of broadcast packets received during the time interval.
Rx Jumbo Packets net.jumboRx.delta.summation.number Number of jumbo packets received during the time interval.
Rx Packet Drop Percent (%) net.packetDropRx.ratio.average.percent Average ratio of total number of dropped Rx packets to total number of Rx packets.
Rx Packet Errors net.errorRx.delta.summation.number Number of received packet errors detected over the network in the selected duration.

For packet-oriented interfaces, Rx packet error indicates the number of inbound packets that contained errors preventing them from being delivered to a higher-layer protocol.

For character-oriented or fixed-length interfaces, Rx packet error indicates the number of inbound transmission units that contained errors preventing them from being delivered to a higher-layer protocol.

Rx Packets net.packetsRx.delta.summation.number Number of packets received during the time interval.
Total Network Traffic net.usage.delta.summation.kiloBytes Sum of data transmitted and received during the time interval.
Tx Broadcast Packets net.broadcastTx.delta.summation.number Number of broadcast packets transmitted during the time interval.
Tx Broadcast Ratio net.broadcastByTx.ratio.average.percent Average percent of broadcast packets transmitted during the time interval.
Tx Jumbo Packets net.jumboTx.delta.summation.number Number of jumbo packets transmitted during the time interval.
Tx Packet Drop Percent net.packetDropTx.ratio.average.percent Ratio of total number of dropped Tx packets to total number of Tx packets.
Tx Packet Errors net.errorTx.delta.summation.number Number of transmitted packet errors detected over the network in the selected duration.

For packet-oriented interfaces, Tx packet errors indicate the number of outbound packets that were not transmitted because of errors.

For character-oriented or fixed-length interfaces, Tx packet errors indicate the number of outbound transmission units that were not transmitted because of errors.

Tx Packets net.packetsTx.delta.summation.number Number of packets transmitted during the time interval.
Unicast Rx Packets net.unicastRx.delta.summation.number Total number of unicast packets received during the time interval.
Unicast Tx Packets net.unicastTx.delta.summation.number Total number of unicast packets transmitted during the time interval.
Unknown Rx Packets net.unknownRx.delta.summation.number Total number of unknown packets received during the time interval.

For packet-oriented interfaces, unknown Rx packets indicate the number of packets received through the interface that were discarded because of an unknown protocol or an unsupported protocol.

For character-oriented or fixed-length interfaces that support protocol multiplexing, unknown Rx packets indicate the number of transmission units received through the interface that were discarded because of an unknown protocol or an unsupported protocol.

Total Rx Bytes net.totalRx.delta.summation.bytes Sum of bytes received during the time interval.
Total Tx Bytes net.totalTx.delta.summation.bytes Sum of bytes transmitted during the time interval.
uRPF Drop Packets net.droppedRPFRx.delta.summation.number Number of packets dropped due to unicast reverse-path forwarding (uRPF)
uRPF Packet Drop Ratio net.droppedRPFRx.rate.average.percent Average ratio of dropped uRPF packets to total Rx packets.