Juniper JUNOSE SOFTWARE 11.2.X - LINK LAYER CONFIGURATION GUIDE 7-7-2010 Configuration Manual page 542

JunosE 11.2.x Link Layer Configuration Guide
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LowerLayerDown—Traffic cannot flow because of a problem in an interface at a
lower protocol layer
NotPresent—Traffic cannot flow because hardware is unavailable
Interface administrative status—Configured state of the interface:
Open—no hdlc shutdown command is operative
Closed—hdlc shutdown command is operative
Interface maximum-transmission-unit—Configured MTU size
Interface keepalive time—Configured keepalive interval value
Interface loop detection—Status of loopback detection: enabled, disabled
Interface statistics:
packets in—Number of inbound packets received on the interface
packets out—Number of outbound packets transmitted on the interface
octets in—Number of inbound octets received on the interface
octets out—Number of outbound octets transmitted on the interface
errors in—Number of inbound errors received on the interface
errors out—Number of outbound errors transmitted on the interface
discards in—Number of inbound packets discarded on the interface
discards out—Number of outbound packets discarded on the interface
Example 1
host1#show hdlc interface serial 5/1:5/1
Cisco-HDLC interface serial 5/1:5/1 is LowerLayerDown
Example 2
host1#show hdlc interface full
Cisco-HDLC interface serial 4/0:2 is Up
Interface administrative status is open
Interface maximum-transmission-unit is 1596
Interface keepalive time is 10 seconds
Interface loop detection is disabled
Interface statistics
packets
octets
errors
discards
Cisco-HDLC interface serial 5/0:1/1 is NotPresent
2 Cisco-HDLC interfaces found
See show hdlc interface.
in out
0 0
242 242
0 0
0 0
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