Reference Guide

602 | Interfaces
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Input Statistics: Displays all the input statistics including:
• Number of packets and bytes into the interface
• Number of packets with IP headers, VLAN tagged headers and
MPLS headers
Note: The sum of the number of packets may not be as expected
since a VLAN tagged IP packet counts as both a VLAN packet and an
IP packet.
• Packet size and the number of those packets inbound to the
interface
• Number of symbol errors, runts, giants, and throttles packets:
symbol errors = number packets containing bad data. That
is, the port MAC detected a physical coding error in the
packet.
runts = number of packets that are less than 64B
giants = packets that are greater than the MTU size
throttles = packets containing PAUSE frames
• Number of CRC, IP Checksum, overrun, and discarded packets:
CRC = packets with CRC/FCS errors
IP Checksum = packets with IP Checksum errors
overrun = number of packets discarded due to FIFO
overrun conditions
discarded = the sum of input symbol errors, runts, giants,
CRC, IP Checksum, and overrun packets discarded without
any processing
Output Statistics: Displays output statistics sent out of the interface including:
• Number of packets, bytes and underruns out of the interface
packets = total number of packets
bytes = total number of bytes
underruns = number of packets with FIFO underrun
conditions
• Number of Multicast, Broadcast and Unicast packets:
Multicasts = number of MAC multicast packets
Broadcasts = number of MAC broadcast packets
Unicasts = number of MAC unicast packets
• Number of IP, VLAN and MPLs packets:
IP Packets = number of IP packets
Vlans = number of VLAN tagged packets
MPLS = number of MPLS packets (found on a LSR
interface)
• Number of throttles and discards packets:
throttles = packets containing PAUSE frames
discarded = number of packets discarded without any
processing
Table 22-5. Lines in show interfaces Command Example (continued)
Line Description