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show interfaces voq

Syntax

Syntax (Junos OS Evolved)

Description

Display the random early detection (RED) drop statistics from all ingress Packet Forwarding Engines associated with the specified physical egress interface. In the VOQ architecture, egress output queues (shallow buffers) buffer data in virtual queues on ingress Packet Forwarding Engines. In cases of congestion, you can use this command to identify which ingress Packet Forwarding Engine is the source of RED-dropped packets contributing to congestion.

Note:

On the PTX Series routers and QFX10000 switches, these statistics include tail-dropped packets.

Options

interface interface-name

Display the ingress VOQ RED drop statistics for the specified egress interface.

forwarding-class forwarding-class-name

Display VOQ RED drop statistics for a specified forwarding class.
non-zero

Display only non-zero VOQ RED drop statistics counters.
source-fpc source-fpc-number

Display VOQ RED drop statistics for the specified source FPC.

Additional Information

  • On PTX Series routers, you can display VOQ statistics for only the WAN physical interface.

  • VOQ statistics for aggregated physical interfaces are not supported. Statistics for an aggregated interface are the summation of the queue statistics of the child links of that aggregated interface. You can use the show interfaces queue command to identify the child link which is experiencing congestion and then view the VOQ statistics on the respective child link using the show interfaces voq command.

For information on virtual output queuing on PTX routers, see Understanding Virtual Output Queues on PTX Series Packet Transport Routers. For information on virtual output queueing on QFX10000 switches, see Understanding CoS Virtual Output Queues (VOQs) on QFX10000 Switches.

Required Privilege Level

view

Output Fields

Table 1 lists the output fields for the show interfaces queue command. Output fields are listed in the approximate order in which they appear.

Table 1: show interfaces voq Output Fields

Field Name

Field Description

Physical interface

Name of the physical interface.

Enabled

State of the interface. Possible values are described in the “Enabled Field” section under Common Output Fields Description.

Interface index

Physical interface's index number, which reflects its initialization sequence.

SNMP ifIndex

SNMP index number for the interface.

Queue

Egress queue number.

Forwarding classes

Forwarding class name.

FPC number

Number of the Flexible PIC Concentrator (FPC) located on ingress.

PFE

Number of the Packet Forwarding Engine providing virtual output queues on the ingress.

RED-dropped packets

Number of packets per second (pps) dropped because of random early detection (RED).

Note:

On the PTX Series routers, these statistics include tail-dropped packets.

RED-dropped bytes

Number of bytes per second dropped because of RED. The byte counts vary by interface hardware.

Note:

On the PTX Series routers, these statistics include tail-dropped packets.

Sample Output

show interfaces voq (For a Specific Physical Interface) (PTX Series Routers)

The following example shows ingress RED-dropped statistics for the egress Ethernet interface configured on port 0 of Physical Interface Card (PIC) 0, located on the FPC in slot 7.

The sample output below shows that the cause of the congestion is ingress Packet Forwarding Engine PFE 0, which resides on FPC number 4, as denoted by the count of RED-dropped packets and RED-dropped bytes for egress queue 0, forwarding classes best-effort and egress queue 3, forwarding class network control.

show interfaces voq (For a Specific Physical Interface) (QFX10000 Switches)

The sample output below shows congestion on ingress PFE 1 on FPC number 0, and on ingress PFE 2 on FPC number 1, as denoted by the count of RED-dropped packets and RED-dropped bytes for best-effort egress queue 0.

show interfaces voq et-7/0/0 (For a Specific Forwarding Class)

show interfaces voq et-5/0/12 (For a Specific Source FPC)

show interfaces voq et-5/0/12 (For a Specific Forwarding Class and Source FPC)

show interfaces voq et-7/0/0 (Non-Zero)

show interfaces voq et-7/0/0 (For a Specific Forwarding Class and Non-Zero)

Release Information

Command introduced in Junos OS Release 14.1.

Related Documentation