Junos® OS Ethernet Interfaces Configuration ... - Juniper Networks

Description: Test
Flags: SNMP-Traps, Encapsulation: ENET2
Protocol inet, MTU: 1500, Flags: None
Addresses, Flags: Is-Preferred Is-Primary
Destination: 10.115.107.192/29, Local: 10.115.107.193
Broadcast: 10.115.107.199
Meaning The sample output shows where the alarm and other errors might be occurring and any
counters that are incrementing. The only alarm associated with Fast Ethernet or Gigabit
Ethernet interfaces is the LINK alarm. A LINK alarm indicates a physical problem. To
isolate where the physical problem might be occurring, conduct loopback testing. See
“Checklist for Using Loopback Testing for Fast Ethernet and Gigabit Ethernet Interfaces”
on page 611 for information on conducting a loopback test.
NOTE: Since link status is polled once every second, some items that require
fast link down detection, such as Multiprotocol Label Switching (MPLS) fast
reroute, take longer to execute.
Fast Ethernet and Gigabit Ethernet Counters
Problem Table 48 on page 623 shows the major counters that appear in the output for the show
interfaces fe-fpc/pic/port extensive and the show interfaces ge-fpc/pic/port extensive
commands. These counters generally increment when there is a problem with a Fast
Ethernet or Gigabit Ethernet interface. In the Counters column, the counters are listed in
the order in which they are displayed in the output.
Table 48: Major Solution Fast Ethernet and Gigabit Ethernet Counters
Counter
Input Errors:
Errors
Policed discards
Drops
L3 incompletes
Description
The sum of the incoming frame
aborts and frame check
sequence (FCS) errors.
The frames discarded by the
incoming packet match code.
The number of packets dropped
by the output queue of the I/O
Manager application-specific
integrated circuit (ASIC).
The number of packets
discarded due to the packets
failing Layer 3 header checks.
Copyright © 2012, Juniper Networks, Inc.
Chapter 35: Investigate Fast Ethernet and Gigabit Ethernet Interfaces
Reason for Increment
The frames were discarded because they were not recognized or of
interest. Usually, this field reports protocols that the Junos OS does not
handle.
If the interface is saturated, this number increments once for every packet
that is dropped by the ASIC’s random early detection (RED) mechanism.
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.
623