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[ACX] When queue drops are present in ‘show interfaces extensive’ output, the ‘Output errors’ drop counter does not increment

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Article ID: KB30943 KB Last Updated: 02 Jun 2016Version: 1.0
Summary:

This article describes the behavior of interface statistics for ‘Output errors’ drop counter and queue drops in the ‘show interfaces extensive’ output on ACX platform.

Symptoms:

The ‘Output errors’ drop counter does not increment when queue drops are present in ‘show interfaces extensive’ output.

lab> show interfaces ge-1/1/0 extensive 
Physical interface: ge-1/1/0, Enabled, Physical link is Up
Interface index: 150, SNMP ifIndex: 521, Generation: 153
Link-level type: Ethernet, Media type: Fiber, MTU: 1514, LAN-PHY mode, Speed: 1000mbps, BPDU Error: None, MAC-REWRITE Error: None, Loopback: Disabled, Source filtering: Disabled,
Flow control: Enabled, Auto-negotiation: Enabled, Remote fault: Online
Device flags : Present Running
Interface flags: SNMP-Traps Internal: 0x0
Link flags : None
CoS queues : 8 supported, 8 maximum usable queues
Hold-times : Up 0 ms, Down 0 ms
Current address: f0:1c:2d:13:c6:46, Hardware address: f0:1c:2d:13:c6:46
Last flapped : 2010-06-11 17:31:56 UTC (04:29:58 ago)
Statistics last cleared: Never
Traffic statistics:
Input bytes : 1391055401752 751485144 bps
Output bytes : 397274554152 200007920 bps
Input packets: 917315425 61881 pps
Output packets: 264849720 16667 pps
IPv6 transit statistics:
Input bytes : 0
Output bytes : 0
Input packets: 0
Output packets: 0
Dropped traffic statistics due to STP State:
Input bytes : 0
Output bytes : 0
Input packets: 0
Output packets: 0
Input errors:
Errors: 0, Drops: 0, Framing errors: 0, Runts: 0, Policed discards: 0, L3 incompletes: 0, L2 channel errors: 0, L2 mismatch timeouts: 0, FIFO errors: 0, Resource errors: 0
Output errors: Carrier transitions: 7, Errors: 0, Drops: 0, Collisions: 0, Aged packets: 0, FIFO errors: 0, HS link CRC errors: 0, MTU errors: 0, Resource errors: 0 Egress queues: 8 supported, 8 in use
Queue counters: Queued packets Transmitted packets Dropped packets
0 BE 631054791 264849757 366205034
1 AF1 0 0 0
2 AF2 0 0 0
3 AF3 17 17 0
4 AF4 0 0 0
5 EF 0 0 0
6 CS6 0 0 0
7 CS7 0 0 0
Queue number: Mapped forwarding classes
0 BE
1 AF1
2 AF2
3 AF3
4 AF4
5 EF
6 CS6
7 CS7
Active alarms : None
Active defects : None
MAC statistics: Receive Transmit
Total octets 1391055401752 397274554152
Total packets 917315425 264849720
Unicast packets 79409851 264849708
Broadcast packets 10 12
Multicast packets 0 0
CRC/Align errors 0 0
FIFO errors 0 0
MAC control frames 0 0
MAC pause frames 0 0
Oversized frames 837905563
Jabber frames 0
Fragment frames 0
VLAN tagged frames 0
Code violations 0
Filter statistics:
Input packet count 917315425
Input packet rejects 14064080
Input DA rejects 0
Input SA rejects 0
Output packet count 264849720
Output packet pad count 0
Output packet error count 0
CAM destination filters: 0, CAM source filters: 0
Autonegotiation information:
Negotiation status: Complete
Link partner:
Link mode: Full-duplex, Flow control: Symmetric, Remote fault: OK
Local resolution:
Flow control: Symmetric, Remote fault: Link OK
Packet Forwarding Engine configuration:
Destination slot: 1
CoS information:
Direction : Output
CoS transmit queue Bandwidth Buffer Priority Limit
% bps % usec
0 BE 10 20000000 10 0 low none
1 AF1 70 140000000 70 0 low none
2 AF2 r r r 0 low none
3 AF3 r r r 0 low none
4 AF4 r r r 0 low none
5 EF r r r 0 strict-high none
6 CS6 r r r 0 strict-high none
7 CS7 r r r 0 strict-high none
Interface transmit statistics: Disabled

lab> show interfaces queue ge-1/1/0 
Physical interface: ge-1/1/0, Enabled, Physical link is Up
Interface index: 150, SNMP ifIndex: 521
Forwarding classes: 8 supported, 8 in use
Egress queues: 8 supported, 8 in use
Queue: 0, Forwarding classes: BE
Queued:
Packets : 633090166 41129 pps
Bytes : 949635340564 493354448 bps
Transmitted:
Packets : 265674774 16668 pps
Bytes : 398512159564 200019800 bps
Tail-dropped packets : Not Available Total-dropped packets: 367415392 24461 pps Total-dropped bytes : 551123181000 293334648 bps
Queue Buffer Usage:
Reserved buffer : 1 pkts 0 bytes
Shared buffer : 768 pkts 1179520 bytes
Solution:

This is a day-1 function designed for ACX series routers. Queue drops will not be covered or counted under the drops counter of ‘Output errors’ seen in the ‘show interfaces extensive’ output. This behavior is applicable on Junos 15.1R3 and earlier versions.

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