Related Documentation
Locating ATM Alarms and Errors
List of Common ATM Alarms and Error
Purpose
To check Asynchronous Transfer Mode (ATM) alarms and errors on both ATM1 and ATM2 IQ interfaces.
Action
Table 1 provides links and commands for checking ATM alarms and errors.
Table 1: List of Common ATM Alarms and Error
Tasks | Command or Action |
|---|---|
| Displaying ATM1 and ATM2 Alarms and Errors | show interfaces at-fpc/pic/port extensive |
Displaying ATM1 and ATM2 Alarms and Errors
Purpose
The alarms and errors that appear on an ATM1 or an ATM2 IQ interface are identical. ATM alarms and errors are dependent on the ATM interface media. If the ATM interface is an OC3 or OC12 interface media, the media statistics are SONET statistics. If the ATM interface is a T3 interface media, the media statistics are T3 statistics.
For information on determining the type of ATM interface on your router, see Checklist for Determining ATM Interface Type.
Action
To display ATM alarms and errors, use the following Junos OS command-line interface (CLI) operational mode command:
Sample Output 1
user@host> show interfaces at-2/0/0 extensive Physical interface: at-2/0/0, Enabled, Physical link is Up
Interface index: 22, SNMP ifIndex: 42, Generation: 21
Link-level type: ATM-PVC, MTU: 4482, Clocking: Internal, SONET mode, Speed: OC3 , Loopback: None, Payload scrambler: Enabled
Device flags : Present Running
Link flags : None
Hold-times : Up 0 ms, Down 0 ms
Statistics last cleared: 2002-07-29 14:28:14 EDT (00:00:26 ago)
Traffic statistics:
Input bytes : 0 0 bps
Output bytes : 0 0 bps
Input packets: 0 0 pps
Output packets: 0 0 pps
Input errors:
Errors: 0, Drops: 0, Invalid VCs: 0, Framing errors: 0, Policed discards: 0, L3 incompletes: 0, L2 channel errors: 0,
L2 mismatch timeouts: 0
Output errors:
Carrier transitions: 0, Errors: 0, Drops: 0, Aged packets: 0
SONET alarms : None
SONET defects : None
SONET PHY: Seconds Count State
PLL Lock 0 0 OK
PHY Light 0 0 OK
SONET section:
BIP-B1 0 0
SEF 0 0 OK
LOS 0 0 OK
LOF 0 0 OK
ES-S 0
SES-S 0
SEFS-S 0
SONET line:
BIP-B2 0 0
REI-L 0 0
RDI-L 0 0 OK
AIS-L 0 0 OK
BERR-SF 0 0 OK
BERR-SD 0 0 OK
ES-L 0
SES-L 0
UAS-L 0
ES-LFE 0
SES-LFE 0
UAS-LFE 0
SONET path:
BIP-B3 0 0
REI-P 0 0
LOP-P 0 0 OK
AIS-P 0 0 OK
RDI-P 0 0 OK
UNEQ-P 0 0 OK
PLM-P 0 0 OK
ES-P 0
SES-P 0
UAS-P 0
ES-PFE 0
SES-PFE 0
UAS-PFE 0
Received SONET overhead:
F1 : 0x00, J0 : 0x00, K1 : 0x00, K2 : 0x00
S1 : 0x00, C2 : 0x13, C2(cmp) : 0x13, F2 : 0x00
Z3 : 0x00, Z4 : 0x00, S1(cmp) : 0x00, V5 : 0x00
V5(cmp) : 0x00
Transmitted SONET overhead:
F1 : 0x00, J0 : 0x01, K1 : 0x00, K2 : 0x00
S1 : 0x00, C2 : 0x13, F2 : 0x00, Z3 : 0x00
Z4 : 0x00, V5 : 0x00
ATM status:
HCS state: Sync
LOC : OK
ATM Statistics:
Uncorrectable HCS errors: 0, Correctable HCS errors: 0, Tx cell FIFO overruns: 0, Rx cell FIFO overruns: 0,
Rx cell FIFO underruns: 0, Input cell count: 0, Output cell count: 8830024, Output idle cell count: 8830026,
Output VC queue drops: 0, Input no buffers: 0, Input length errors: 0, Input timeouts: 0, Input invalid VCs: 0,
Input bad CRCs: 0, Input OAM cell no buffers: 0
PFE configuration:
Destination slot: 2
CoS transmit queue Bandwidth Buffer Priority Limit
% bps % bytes
0 best-effort 0 0 0 0 low none
1 expedited-forwarding 0 0 0 0 low none
2 assured-forwarding 0 0 0 0 low none
3 network-control 0 0 0 0 low none
Logical interface at-2/0/0.0 (Index 29) (SNMP ifIndex 49) (Generation 28)
Flags: Point-To-Point SNMP-Traps Encapsulation: ATM-SNAP
Traffic statistics:
Input bytes : 0
Output bytes : 0
Input packets: 0
Output packets: 0
Local statistics:
Input bytes : 0
Output bytes : 0
Input packets: 0
Output packets: 0
Transit statistics:
Input bytes : 0 0 bps
Output bytes : 0 0 bps
Input packets: 0 0 pps
Output packets: 0 0 pps
Protocol inet, MTU: 4470, Flags: None, Generation: 31 Route table: 0
Addresses, Flags: Is-Preferred Is-Primary
Destination: 192.168.1.0/30, Local: 192.168.1.1, Broadcast: Unspecified, Generation: 59
VCI 1.100
Flags: Active
Total down time: 0 sec, Last down: Never
ATM per-VC transmit statistics:
Tail queue packet drops: 0
Traffic statistics:
Input bytes : 0
Output bytes : 0
Input packets: 0
Output packets: 0
Meaning
Sample output 1 shows the error statistics for an OC3 ATM interface. SONET alarms and errors fall into three different areas of the output: section, line, and path. SeeList of Common SONET Alarms and Errors for information on SONET alarms.
Sample Output 2
user@host> show interfaces at-3/1/0 extensive Physical interface: at-3/1/0, Enabled, Physical link is Up
Interface index: 57, SNMP ifIndex: 66, Generation: 56
Description: customer
Link-level type: ATM-PVC, MTU: 4482, Clocking: Internal, Speed: T3 , Loopback: None,
Payload scrambler: Disabled, Mode: C/Bit parity, Line build-out: 10, ATM Encapsulation: PLCP
Device flags : Present Running
Link flags : None
Hold-times : Up 0 ms, Down 0 ms
Statistics last cleared: 2002-07-30 15:36:58 UTC (00:00:02 ago)
Traffic statistics:
Input bytes : 270798 1067704 bps
Output bytes : 2260295 8911952 bps
Input packets: 2001 986 pps
Output packets: 2506 1235 pps
Input errors:
Errors: 0, Drops: 0, Invalid VCs: 0, Framing errors: 0, Policed discards: 0, L3 incompletes: 0,
L2 channel errors: 0, L2 mismatch timeouts: 0
Output errors:
Carrier transitions: 0, Errors: 0, Drops: 0, Aged packets: 0
Active alarms : None
Active defects : None
DS3 media : Seconds Count State
PLL Lock 0 0 OK
Reframing 0 0 OK
AIS 0 0 OK
LOF 0 0 OK
LOS 0 0 OK
YELLOW 0 0 OK
EXZ 0 0
LCV 0 0
PCV 0 0
FERR 0 0
LES 0
PES 0
PSES 0
SEFS 0
UAS 0
PLCP defects: Seconds Count State
LOF 0 0
YELLOW 0 0
ATM defects: Seconds Count State
LCD 0 0
ATM status:
HCS state: Hunt
LOC : OK
PLCP statistics (errored seconds):
Framing errors : 0(0)
Bit interleaved parity errors: 0(0)
Far end block errors : 0(0)
ATM Statistics:
Uncorrectable HCS errors: 0, Correctable HCS errors: 0, Tx cell FIFO overruns: 0,
Rx cell FIFO overruns: 0, Rx cell FIFO underruns: 0, Input cell count: 7716,
Output cell count: 191980, Output idle cell count: 144302, Output VC queue drops: 0,
Input no buffers: 0, Input length errors: 0, Input timeouts: 0, Input invalid VCs: 0,
Input bad CRCs: 0, Input OAM cell no buffers: 0
PFE configuration:
Destination slot: 3
CoS transmit queue Bandwidth Buffer Priority Limit
% bps % bytes
0 best-effort 0 0 0 0 low none
1 expedited-forwarding 0 0 0 0 low none
2 assured-forwarding 0 0 0 0 low none
3 network-control 0 0 0 0 low none
Logical interface at-3/1/0.0 (Index 25) (SNMP ifIndex 85) (Generation 44)
Flags: Point-To-Point Inverse-ARP SNMP-Traps Encapsulation: ATM-SNAP
Traffic statistics:
Input bytes : 270798
Output bytes : 2260295
Input packets: 2001
Output packets: 2506
Local statistics:
Input bytes : 0
Output bytes : 0
Input packets: 0
Output packets: 0
Transit statistics:
Input bytes : 270798 1067704 bps
Output bytes : 2260295 8911952 bps
Input packets: 2001 986 pps
Output packets: 2506 1235 pps
Protocol inet, MTU: 4470, Flags: None, Generation: 51 Route table: 0
Addresses, Flags: Is-Preferred Is-Primary
Destination: 10.10.65.176/30, Local: 10.10.65.177, Broadcast: Unspecified, Generation: 88
VCI 0.5
Flags: Active, Inverse-ARP
Total down time: 0 sec, Last down: Never
ATM per-VC transmit statistics:
Tail queue packet drops: 0
Traffic statistics:
Input bytes : 270798
Output bytes : 2260295
Input packets: 2001
Output packets: 2506
Meaning
Sample output 2 shows the error statistics for a T3 ATM interface. See Checklist of Common T3 Alarms and Errors for information on T3 alarms.
Table 2 describes the input and output errors that appear in the extensive output for an ATM interface.
Table 2: ATM Interface Input and Output Errors
Error | Description | Reason for Error |
|---|---|---|
| Input Errors | ||
Errors | Sum of the incoming frame aborts and frame check sequence (FCS) errors. | |
Drops | 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 random early detection (RED) mechanism. |
Invalid VCs | Number of cells that arrived for a nonexistent virtual circuit (VC). | |
Framing errors | Sum of ATM Adaptation Layer (AAL5) packets that have FCS errors, AAL5 packets that have reassembly timeout errors, and AAL5 packets that have length errors. | |
Policed discards | Frames that the incoming packet match code discarded because they were not recognized or of interest. | Usually, this field reports protocols that the Junos OS does not handle. |
L3 incompletes | Number of packets discarded due to the packets failing Layer 3 header checks. | Increments when the incoming packet fails Layer 3 (usually IPv4) sanity 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 | Errors that occurred when the software could not find a valid logical interface for an incoming frame. | This counter increments when the software cannot find a valid logical interface for an incoming frame. |
L2 mismatch timeouts | Count of malformed or short packets. | Count of malformed or short packets that cause the incoming packet handler to discard the frame as unreadable. |
| Output Errors | ||
Carrier transitions | Number of times the interface went from down to up. | This number should not increment quickly and should increase only when the cable is unplugged, the far-end system is powered down and up, or a similar problem occurs. If it increments quickly (perhaps once every 10 seconds), then the cable, the far-end system, or the Physical Interface Card (PIC) is broken. |
Errors | Sum of the outgoing frame aborts and FCS errors. | |
Drops | 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 | 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 does, it is most likely a software bug or possibly broken hardware. |
Table 3 lists ATM media-specific alarms and defects that can render the interface unable to pass packets. When a defect persists for a certain amount of time, it is promoted to an alarm. Based on the router configuration, an alarm can ring the red or yellow alarm bell on the router or trigger the red or yellow alarm LED on the craft interface. For complete explanations of most of these alarms and defects, see Chapter 6 in GR-253, Synchronous Optical Network (SONET) Transport Systems: Common Generic Criteria.
Table 3: ATM Active Alarms and Defects
Alarm | Description |
|---|---|
AIS | Alarm indication signal |
AIS-L | Alarm indication signal (line) |
AIS-P | Alarm indication signal (path) |
BERR | Bit error rate |
BERR-SD | Bit error rate defect–signal degrade |
BERR-SF | Bit error rate fault–signal fail |
EXZ | Excessive zeros |
FERF | Far end receive failures |
IDLE | Idle code detected |
LCD | Loss of cell delineation |
LCV | Line code violation |
LOC | Loss of cell delineation |
LOF | Loss of frame |
LOL | Loss of light |
LOP | Loss of pointer |
LOS | Loss of signal |
PLL | Phase-locked loop out of lock |
PLCP_LOF | Loss of PLCP frame alarm |
PLCP_YLW PLCP | Alarm at the remote end |
PLM-P | Payload label mismatch |
RDI | Remote defect indication |
RDI-L | Remote defect indication (line) |
RDI-P | Remote defect indication (path) |
REI | Remote error indication |
SEF | Severely errored frame |
UNEQ | Unequipped |
YLW | Remote defect indication (yellow alarm) |
