| Input Errors: |
Errors
|
The sum of the incoming frame aborts and frame check
sequence (FCS) errors.
|
|
Policed discards
|
The frames discarded by the incoming packet match code.
|
The frames were discarded because they were not recognized
or of interest. Usually, this field reports protocols that the JUNOS
software does not handle.
|
Drops
|
The number of packets dropped by the output queue of
the I/O Manager application-specific integrated circuit (ASIC).
|
If the interface is saturated, this number increments
once for every packet that is dropped by the ASIC’s random early
detection (RED) mechanism.
|
L3 incompletes
|
The number of packets discarded due to the packets failing
Layer 3 header checks.
|
This counter increments when the incoming packet fails
Layer 3 (usually IPv4) checks of the header. For example, a frame
with less than 20 bytes of available IP header would be discarded
and this counter would increment.
|
L2 channel errors
|
The errors that occur when the software could not find
a valid logical interface (such as fe-1/2/3.0) for an incoming
frame.
|
This error increments when, for example, a lookup for
a virtual LAN (VLAN) fails.
|
L2 mismatch timeouts
|
The count of malformed or short packets.
|
The malformed or short packets cause the incoming packet
handler to discard the frame and be unreadable.
|
FIFO errors
|
The number of first in, first out (FIFO) errors in the
receive direction as reported by the ASIC on the Physical Interface
Card (PIC).
|
The value in this field should always be 0. If this value
is not zero, cabling could be badly organized or the PIC could be
broken.
|
| Output Errors |
Errors
|
The sum of outgoing frame aborts and FCS errors.
|
|
Collisions
|
The number of Ethernet collisions.
|
The Fast Ethernet PIC supports only full-duplex operation,
so this number should always remain 0. If it is incrementing, there
is a software bug.
|
Drops
|
The 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.
|
Aged packets
|
The number of packets that remained in shared packet
SDRAM for so long that the system automatically purged them.
|
The value in this field should never increment. If it
increments, it is probably a software bug or broken hardware.
|
HS link FCS errors, FIFO errors
|
The number of errors on the high-speed links between
the ASICs responsible for handling the router interfaces.
|
The value in this field should always be 0. If it increments,
either the FPC or the PIC is broken.
|
| Miscellaneous
Counters |
Input DA rejects
|
The number of packets that the filter rejected because
the destination Media Access Control (MAC) address of the packet is
not on the accept list.
|
It is normal for this value to increment. When it increments
very quickly and no traffic is entering the router from the far-end
system, either there is a bad Address Resolution Protocol (ARP) entry
on the far-end system, or multicast routing is not on and the far-end
system is sending many multicast packets to the local router (which
the router is rejecting).
|
Output packet pad count
|
The number of packets that the filter padded to the minimum
Ethernet size (60 bytes) before giving the packet to the MAC hardware.
|
Usually, padding is done only on small ARP packets, but
some very small Internet Protocol (IP) packets can also require padding.
If this value increments rapidly, either the system is trying to find
an ARP entry for a far-end system that does not exist, or it is misconfigured.
|
Output packet error count
|
Number of packets with an indicated error that the filter
was given to transmit.
|
These packets are usually aged packets or are the result
of a bandwidth problem on the FPC hardware. On a normal system, the
value of this field should not increment.
|
CAM destination filters, CAM source filters
|
The number of entries in the content-addressable memory
(CAM) dedicated to destination and source MAC address filters.
|
There can be up to 64 source entries. If source filtering
is disabled, which is the default, the value for these fields should
be 0.
|
