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Table 4: show interfaces Gigabit Ethernet Output Fields (continued)

Level of OutputField DescriptionField Name

extensiveOutput errors on the interface. The following paragraphs explain the counters

whose meaning might not be obvious:

• Carrier transitions—Number of times the interface has gone from down to up.

This number does not normally increment quickly, increasing only when the

cable is unplugged, the far-end system is powered down and then up, or

another problem occurs. If the number of carrier transitions increments quickly

(perhaps once every 10 seconds), the cable, the far-end system, or the PIC

or PIM is malfunctioning.

• Errors—Sum of the outgoing frame aborts and FCS errors.

• Drops—Number of packets dropped by the output queue of the I/O Manager

ASIC. If the interface is saturated, this number increments once for every

packet that is dropped by the ASIC's RED mechanism.

NOTE: Due to accounting space limitations on certain Type 3 FPCs (which are

supported in M320 and T640 routers), the Drops field does not always use the

correct value for queue 6 or queue 7 for interfaces on 10-port 1-Gigabit Ethernet

PICs.

• Collisions—Number of Ethernet collisions. The Gigabit Ethernet PIC supports

only full-duplex operation, so for Gigabit Ethernet PICs, this number should

always remain 0. If it is nonzero, there is a software bug.

• Aged packets—Number of packets that remained in shared packet SDRAM

so long that the system automatically purged them. The value in this field

should never increment. If it does, it is most likely a software bug or possibly

malfunctioning hardware.

• FIFO errors—Number of FIFO errors in the send direction as reported by the

ASIC on the PIC. If this value is ever nonzero, the PIC is probably

malfunctioning.

• HS link CRC errors—Number of errors on the high-speed links between the

ASICs responsible for handling the router interfaces.

• MTU errors—Number of packets whose size exceeded the MTU of the interface.

• Resource errors—Sum of transmit drops.

Output errors

detail extensiveTotal number of egress queues supported on the specified interface.Egress queues

detail extensiveCoS queue number and its associated user-configured forwarding class name.

• Queued packets—Number of queued packets.

• Transmitted packets—Number of transmitted packets.

• Dropped packets—Number of packets dropped by the ASIC's RED mechanism.

NOTE: Due to accounting space limitations on certain Type 3 FPCs (which are

supported in M320 and T640 routers), the Dropped packets field does not always

display the correct value for queue 6 or queue 7 for interfaces on 10-port 1-Gigabit

Ethernet PICs.

Queue counters

(Egress)

extensiveTotal number of ingress queues supported on the specified interface. Displayed

on IQ2 interfaces.

Ingress queues

Static ARP Table Entries Feature Guide for Routing Devices

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