Locate Channelized DS3 Alarms and Errors
Checklist for Channelized DS3 Alarms and Errors
Purpose
To check the most common Channelized DS3 alarms and errors when investigating line problems on a Juniper Networks router.
Action
Table 1 provides links and commands for Channelized DS3 alarms and errors.
Table 1: Checklist for Channelized DS3 Alarms and Errors
Tasks | Command or Action |
|---|---|
| Display Alarms and Errors for Channelized DS3 Interfaces | show interfaces t1-fpc/pic/port:channel extensive |
Display Alarms and Errors for Channelized DS3 Interfaces
Purpose
To display channelized DS3 alarms and errors, use the following Junos OS command-line interface (CLI) operational mode command:
Action
Sample Output 1
user@host> show interfaces t1-1/2/0:5 extensive
Physical interface: t1-1/2/0:5, Enabled, Physical link is Up
Interface index: 181, SNMP ifIndex: 210, Generation: 96
Description: T1 to Tombstone – Circuit # 123456789
Link-level type: PPP, MTU: 1504, Clocking: Internal, Speed: T1, Loopback: None, FCS: 16, Framing: ESF,
Parent: ct3-1/2/0 Interface index 173
Device flags : Present Running
Interface flags: Point-To-Point SNMP-Traps
Link flags : Keepalives
Hold-times : Up 0 ms, Down 0 ms
Keepalive settings: Interval 60 seconds, Up-count 1, Down-count 3
Keepalive statistics:
Input : 6910 (last seen 00:00:21 ago)
Output: 6886 (last sent 00:00:04 ago)
LCP state: Opened
NCP state: inet: Opened, inet6: Not-configured, iso: Not-configured, mpls: Not-configured
CHAP state: Not-configured
CoS queues : 4 supported
Last flapped : 2004-05-11 16:01:30 EDT (5d 02:53 ago)
Statistics last cleared: 2004-05-11 23:43:42 EDT (4d 19:10 ago)
Traffic statistics:
Input bytes : 551301316 4432 bps
Output bytes : 4091306894 2696 bps
Input packets: 5231609 6 pps
Output packets: 4867661 3 pps
Input errors:
Errors: 47, Drops: 0, Framing errors: 0, Runts: 0, Giants: 0, Policed discards: 398, L3 incompletes: 0, L2 channel errors: 0,
L2 mismatch timeouts: 0, HS link CRC errors: 0, SRAM errors: 0
Output errors:
Carrier transitions: 0, Errors: 0, Drops: 0, Aged packets: 0
Queue counters: Queued packets Transmitted packets Dropped packets
0 best-effort 4820512 4804578 24909
1 expedited-fo 0 0 0
2 assured-forw 0 0 0
3 network-cont 63083 63083 0
DS1 alarms : None
DS1 defects : None
T1 media: Seconds Count State
SEF 5 4 OK
BEE 246 127 OK
AIS 0 0 OK
LOF 0 0 OK
LOS 0 0 OK
YELLOW 0 0 OK
BPV 0 0
EXZ 0 0
LCV 246 538
PCV 0 0
CS 0 0
LES 0
ES 0
SES 8
SEFS 12
BES 0
UAS 0
HDLC configuration:
Policing bucket: Disabled
Shaping bucket : Disabled
Giant threshold: 1514, Runt threshold: 0
Timeslots : All active
Line encoding: B8ZS, Byte encoding: Nx64K
Buildout : 0 to 132 feet
Data inversion: Disabled, Idle cycle flag: flags, Start end flag: shared
DS1 BERT configuration:
BERT time period: 10 seconds, Elapsed: 0 seconds
Induced Error rate: 10e-0, Algorithm: 2^15 - 1, O.151, Pseudorandom (9)
Packet Forwarding Engine configuration:
Destination slot: 1, PLP byte: 4 (0x01)
Logical interface t1-1/2/0:5.0 (Index 86) (SNMP ifIndex 238) (Generation 111)
Flags: Point-To-Point SNMP-Traps Encapsulation: PPP
Protocol inet, MTU: 1500, Generation: 117, Route table: 0
Flags: None
Addresses, Flags: Is-Preferred Is-Primary
Destination: 68.71.141.32/30, Local: 68.71.141.33, Broadcast: 68.71.141.35, Generation: 169
Sample Output 2
user@host> show interfaces t1-1/2/0:19 extensive Physical interface: t1-1/2/0:19, Enabled, Physical link is Down
Interface index: 148, SNMP ifIndex: 224, Generation: 110
Description: T1 to Rock City – Circuit # 987654321
Link-level type: PPP, MTU: 1504, Clocking: Internal, Speed: T1, Loopback: None, FCS: 16, Framing: ESF,
Parent: ct3-1/2/0 Interface index 173
Device flags : Present Running Down
Interface flags: Hardware-Down Point-To-Point SNMP-Traps
Link flags : Keepalives
Hold-times : Up 0 ms, Down 0 ms
Keepalive settings: Interval 60 seconds, Up-count 1, Down-count 3
Keepalive statistics:
Input : 0 (last seen: never)
Output: 0 (last sent: never)
LCP state: Conf-req-sent
NCP state: inet: Down, inet6: Not-configured, iso: Not-configured, mpls: Not-configured
CHAP state: Not-configured
CoS queues : 4 supported
Last flapped : 2004-05-14 15:56:43 EDT (2d 03:01 ago)
Statistics last cleared: 2004-04-09 13:30:02 EDT (5w2d 05:28 ago)
Traffic statistics:
Input bytes : 89198 0 bps
Output bytes : 90532 0 bps
Input packets: 6371 0 pps
Output packets: 6448 0 pps
Input errors:
Errors: 271124, Drops: 0, Framing errors: 0, Runts: 0, Giants: 0, Policed discards: 266254, L3 incompletes: 0,
L2 channel errors: 2, L2 mismatch timeouts: 2, HS link CRC errors: 0, SRAM errors: 0
Output errors:
Carrier transitions: 32, Errors: 0, Drops: 0, Aged packets: 0
Queue counters: Queued packets Transmitted packets Dropped packets
0 best-effort 0 0 0
1 expedited-fo 0 0 0
2 assured-forw 0 0 0
3 network-cont 6448 6448 0
DS1 alarms : AIS, LOF
DS1 defects : AIS, LOF
T1 media: Seconds Count State
SEF 33 31 OK
BEE 53 47 OK
AIS 3201537 15 Defect Active
LOF 3202041 16 Defect Active
LOS 0 0 OK
YELLOW 1023435 0 OK
BPV 0 0
EXZ 0 0
LCV 53 72
PCV 0 0
CS 0 0
LES 3202041
ES 3202041
SES 3202060
SEFS 3202102
BES 0
UAS 3202160
HDLC configuration:
Policing bucket: Disabled
Shaping bucket : Disabled
Giant threshold: 1514, Runt threshold: 0
Timeslots : All active
Line encoding: B8ZS, Byte encoding: Nx64K
Buildout : 0 to 132 feet
Data inversion: Disabled, Idle cycle flag: flags, Start end flag: shared
DS1 BERT configuration:
BERT time period: 10 seconds, Elapsed: 0 seconds
Induced Error rate: 10e-0, Algorithm: 2^15 - 1, O.151, Pseudorandom (9)
Packet Forwarding Engine configuration:
Destination slot: 1, PLP byte: 4 (0x04)
Logical interface t1-1/2/0:19.0 (Index 91) (SNMP ifIndex 256) (Generation 115)
Flags: Hardware-Down Device-Down Point-To-Point SNMP-Traps Encapsulation: PPP
Protocol inet, MTU: 1500, Generation: 121, Route table: 0
Flags: Protocol-Down
Addresses, Flags: Dest-route-down Is-Preferred Is-Primary
Destination: 68.71.141.136/30, Local: 68.71.141.137, Broadcast: 68.71.141.139, Generation: 179
Meaning
The sample output shows the active alarms and active defects. Sample output 1 shows no active alarms or defects.
Sample output 2 shows that the physical and logical links are down, with active alarms and defects. When a major error (such as an alarm indication signal [AIS]) is seen for a few consecutive frames, a defect is declared within 1 second from detection. At the defect level, the interface is taken down and routing protocols are immediately notified (this is the default). In most cases, when a defect persists for 2.5 seconds plus or minus 0.5 seconds, an alarm is declared.
Notification messages are logged at the alarm level. Depending on the type of T1 alarm, you can configure the craft panel to display the red or yellow alarm LED and simultaneously have the alarm relay activate a physically connected device (such as a bell).
Table 2 shows T1 media-specific alarms or defects that can render the interface unable to pass packets.
Table 2: T1 Media Alarms and Error Definitions
T1 Media Alarm or Error | Definitions |
|---|---|
AIS | Alarm indication signal (blue alarm) |
BEE | Block error event |
BES | Bursty errored seconds |
BPV | Bipolar violation |
CS | Controlled slip |
ES | Errored seconds |
EXZ | Excessive zeros |
LCV | Line code violation |
LES | Line errored seconds |
LOF | Loss of frame |
LOS | Loss of signal |
PCV | Path code violation |
SEF | Severely errored frame |
SEFS | Severely errored frame seconds |
SES | Severely errored seconds |
UAS | Unavailable seconds |
YLW | Yellow alarm |
See Checklist for T1 Alarms and Errors for more details on T1 alarms and statistics.
