[Contents] [Prev] [Next] [Index] [Report an Error]

show interfaces queue

Syntax

show interfaces queue 

<both-ingress-egress>

<egress>

<forwarding-class forwarding-class>

<ingress>

<interface-name interface-name>

Release Information

Command introduced before JUNOS Release 7.4.
both-ingress-egress, egress, and ingress options introduced in JUNOS Release 7.6.

Description

Display class-of-service (CoS) queue information for physical interfaces.

Options

none—Show detailed CoS queue statistics for all physical interfaces.

both-ingress-egress—(Optional) On Gigabit Ethernet Intelligent Queuing 2 (IQ2) PICs, display both ingress and egress queue statistics.

egress—(Optional) Display egress queue statistics.

forwarding-class forwarding-class—(Optional) Forwarding class name for this queue. Shows detailed CoS statistics for the queue associated with the specified forwarding class.

ingress—(Optional) On Gigabit Ethernet IQ2 PICs, display ingress queue statistics.

interface-name interface-name—(Optional) Show detailed CoS queue statistics for the specified interface.

Additional Information

On the M-series routing platform (except for the M320 router), this command is valid only for a PIC installed on an enhanced Flexible PIC Concentrator (FPC).

Queue statistics for aggregated interfaces are supported on the M-series and T-series routing platforms only. Statistics for an aggregated interface are the summation of the queue statistics of the child links of that aggregated interface. You can view the statistics for a child interface by using the show interface statistics command for that child interface.

When you configure tricolor marking on a 10-port 1-Gigabit Ethernet PIC, for queues 6 and 7 only, the output does not display the number of queued bytes and packets, or the number of bytes and packets dropped because of RED. If you do not configure tricolor marking on the interface, these statistics are available for all queues.

For Gigabit Ethernet IQ2 PICs, the show interfaces queue command output does not display the number of queued packets and bytes.

When fragmentation occurs on the egress interface, the first set of packet counters shows the postfragmentation values. The second set of packet counters (under the Packet Forwarding Engine Chassis Queues field) shows the prefragmentation values.

For information about how to configure CoS, see the JUNOS Network Interfaces Configuration Guide. For related CoS operational mode commands, see the JUNOS System Basics and Services Command Reference.

Required Privilege Level

view

List of Sample Output

show interfaces queue (Aggregated Ethernet on a T320 Router)
show interfaces queue (Fast Ethernet on a J4300 Router)
show interfaces queue (Gigabit Ethernet on a T640 Router)
show interfaces queue both-ingress-egress (Gigabit Ethernet IQ2)
show interfaces queue ingress (Gigabit Ethernet IQ2)
show interfaces queue egress (Gigabit Ethernet IQ2)

Output Fields

Table 17 lists the output fields for the show interfaces queue command. Output fields are listed in the approximate order in which they appear.

Table 17: show interfaces queue Output Fields
Field Name
Field Description

Physical interface

Name of the physical interface.

Enabled

State of the interface. Possible values are described in Enabled Field.

Interface index

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

SNMP ifIndex

SNMP index number for the interface.

Forwarding classes supported

Total number of forwarding classes supported on the specified interface.

Forwarding classes in use

Total number of forwarding classes in use on the specified interface.

Ingress queues supported

On Gigabit Ethernet IQ2 PICs only, total number of ingress queues supported on the specified interface.

Ingress queues in use

On Gigabit Ethernet IQ2 PICs only, total number of ingress queues in use on the specified interface.

Egress queues supported

Total number of egress queues supported on the specified interface.

Egress queues in use

Total number of egress queues in use on the specified interface.

Queue

Queue number.

Burst size

(Logical interfaces on IQ PICs only) Maximum number of bytes up to which the logical interface can burst. The burst size is based on the shaping rate applied to the interface.

Forwarding classes

Forwarding class name.

Queued Packets

Number of packets queued to this queue.

Queued Bytes

Number of bytes queued to this queue. The byte counts vary by PIC type. For more information, see Table 18.

Transmitted Packets

Number of packets transmitted by this queue. When fragmentation occurs on the egress interface, the first set of packet counters shows the postfragmentation values. The second set of packet counters (displayed under the Packet Forwarding Engine Chassis Queues field) shows the prefragmentation values.

Transmitted Bytes

Number of bytes transmitted by this queue. The byte counts vary by PIC type. For more information, see Table 18.

Tail-dropped packets

Number of packets dropped because of tail drop.

RED-dropped packets

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

  • (M-series and T-series routing platforms only) On M320 routers and the T-series routing platform, the total number of dropped packets is displayed. On all other M-series routers, the output classifies dropped packets into the following categories:
  • Low, non-TCP—Number of low-loss priority non-TCP packets dropped because of RED.
  • Low, TCP—Number of low-loss priority TCP packets dropped because of RED.
  • High, non-TCP—Number of high-loss priority non-TCP packets dropped because of RED.
  • High, TCP—Number of high-loss priority TCP packets dropped because of RED.
  • (J-series routing platform only) The output classifies dropped packets into the following categories:
  • Low—Number of low-loss priority packets dropped because of RED.
  • Medium-low—Number of medium-low loss priority packets dropped because of RED.
  • Medium-high—Number of medium-high loss priority packets dropped because of RED.
  • High—Number of high-loss priority packets dropped because of RED.

RED-dropped bytes

Number of bytes dropped because of RED. The byte counts vary by PIC type. For more information, see Table 18.

  • (M-series and T-series routing platforms only) On M320 routers and the T-series routing platform, only the total number of dropped bytes is displayed. On all other M-series routers, the output classifies dropped bytes into the following categories:
  • Low, non-TCP—Number of low-loss priority non-TCP bytes dropped because of RED.
  • Low, TCP—Number of low-loss priority TCP bytes dropped because of RED.
  • High, non-TCP—Number of high-loss priority non-TCP bytes dropped because of RED.
  • High, TCP—Number of high-loss priority TCP bytes dropped because of RED.
  • (J-series routing platform only) The output classifies dropped bytes into the following categories:
  • Low—Number of low-loss priority bytes dropped because of RED.
  • Medium-low—Number of medium-low loss priority bytes dropped because of RED.
  • Medium-high—Number of medium-high loss priority bytes dropped because of RED.
  • High—Number of high-loss priority bytes dropped because of RED.

show interfaces queue (Aggregated Ethernet on a T320 Router)

The following example shows that the aggregated Ethernet interface, ae1, has traffic on queues af1 and af12:

user@host> show interfaces queue ae1

Physical interface: ae1, Enabled, Physical link is Up

Interface index: 158, SNMP ifIndex: 33 Forwarding classes: 8 supported, 8 in use

Output queues: 8 supported, 8 in use

Queue: 0, Forwarding classes: be

  Queued:

    Packets              :                     5                     0 pps

    Bytes                :                   242                     0 bps

  Transmitted:

    Packets              :                     5                     0 pps

    Bytes                :                   242                     0 bps

    Tail-dropped packets :                     0                     0 pps

    RED-dropped packets  :                     0                     0 pps

    RED-dropped bytes    :                     0                     0 bps

Queue: 1, Forwarding classes: af1

  Queued:

    Packets              :              42603765                595484 pps

    Bytes                :            5453281920             609776496 bps

  Transmitted:

    Packets              :              42603765                595484 pps

    Bytes                :            5453281920             609776496 bps

    Tail-dropped packets :                     0                     0 pps

    RED-dropped packets  :                     0                     0 pps

    RED-dropped bytes    :                     0                     0 bps

Queue: 2, Forwarding classes: ef1

  Queued:

    Packets              :                     0                     0 pps

    Bytes                :                     0                     0 bps

  Transmitted:

    Packets              :                     0                     0 pps

    Bytes                :                     0                     0 bps

    Tail-dropped packets :                     0                     0 pps

    RED-dropped packets  :                     0                     0 pps

    RED-dropped bytes    :                     0                     0 bps

Queue: 3, Forwarding classes: nc

  Queued:

    Packets              :                    45                     0 pps

    Bytes                :                  3930                     0 bps

  Transmitted:

    Packets              :                    45                     0 pps

    Bytes                :                  3930                     0 bps

    Tail-dropped packets :                     0                     0 pps

    RED-dropped packets  :                     0                     0 pps

    RED-dropped bytes    :                     0                     0 bps

Queue: 4, Forwarding classes: af11

  Queued:

    Packets              :                     0                     0 pps

    Bytes                :                     0                     0 bps

  Transmitted:

    Packets              :                     0                     0 pps

    Bytes                :                     0                     0 bps

    Tail-dropped packets :                     0                     0 pps

    RED-dropped packets  :                     0                     0 pps

    RED-dropped bytes    :                     0                     0 bps

Queue: 5, Forwarding classes: ef11

  Queued:

    Packets              :                     0                     0 pps

    Bytes                :                     0                     0 bps

  Transmitted:

    Packets              :                     0                     0 pps

    Bytes                :                     0                     0 bps

    Tail-dropped packets :                     0                     0 pps

    RED-dropped packets  :                     0                     0 pps

    RED-dropped bytes    :                     0                     0 bps

Queue: 6, Forwarding classes: af12

  Queued:

    Packets              :              31296413                437436 pps

    Bytes                :            4005940864             447935200 bps

  Transmitted:

    Packets              :              31296413                437436 pps

    Bytes                :            4005940864             447935200 bps

    Tail-dropped packets :                     0                     0 pps

    RED-dropped packets  :                     0                     0 pps

    RED-dropped bytes    :                     0                     0 bps

Queue: 7, Forwarding classes: nc2

  Queued:

    Packets              :                     0                     0 pps

    Bytes                :                     0                     0 bps

  Transmitted:

    Packets              :                     0                     0 pps

    Bytes                :                     0                     0 bps

    Tail-dropped packets :                     0                     0 pps

    RED-dropped packets  :                     0                     0 pps

    RED-dropped bytes    :                     0                     0 bps

show interfaces queue (Fast Ethernet on a J4300 Router)

user@host> show interfaces queue fe-4/0/0.0

Logical interface fe-4/0/0.0 (Index 71) (SNMP ifIndex 42) 

Forwarding classes: 8 supported, 8 in use

Output queues: 8 supported, 8 in use

Queue: 0, Forwarding classes: be

  Queued:

    Packets              :               5240762                  3404 pps

    Bytes                :            3020710354              15934544 bps

  Transmitted:

    Packets              :               5240762                  3404 pps

    Bytes                :            3020710354              15934544 bps

    Tail-dropped packets :                     0                     0 pps

    RED-dropped packets  :                     0                     0 pps

     Low                 :                     0                     0 pps

     Medium-low          :                     0                     0 pps

     Medium-high         :                     0                     0 pps

     High                :                     0                     0 pps

    RED-dropped bytes    :                     0                     0 bps

     Low                 :                     0                     0 pps

     Medium-low          :                     0                     0 pps

     Medium-high         :                     0                     0 pps

     High                :                     0                     0 pps

Queue: 1, Forwarding classes: af1

  Queued:

    Packets              :               2480391                  1650 pps

    Bytes                :            1304685666               6945704 bps

  Transmitted:

    Packets              :               2478740                  1650 pps

    Bytes                :            1303817240               6945704 bps

    Tail-dropped packets :                     0                     0 pps

    RED-dropped packets  :                  1651                     0 pps

     Low                 :                     0                     0 pps

     Medium-low          :                     0                     0 pps

     Medium-high         :                     0                     0 pps

     High                :                  1651                     0 pps

    RED-dropped bytes    :                868426                     0 bps

     Low                 :                     0                     0 pps

     Medium-low          :                     0                     0 pps

     Medium-high         :                     0                     0 pps

     High                :                868426                     0 pps

show interfaces queue (Gigabit Ethernet on a T640 Router)

user@host> show interfaces queue 

Physical interface: ge-7/0/1, Enabled, Physical link is Up

   Interface index: 150, SNMP ifIndex: 42

 Forwarding classes: 8 supported, 8 in use

 Output queues: 8 supported, 8 in use

 Queue: 0, Forwarding classes: be

   Queued:

     Packets              :                    13                     0 pps

     Bytes                :                   622                     0 bps

   Transmitted:

     Packets              :                    13                     0 pps

     Bytes                :                   622                     0 bps

     Tail-dropped packets :                     0                     0 pps

     RED-dropped packets  :                     0                     0 pps

     RED-dropped bytes    :                     0                     0 bps

 Queue: 1, Forwarding classes: af1

   Queued:

     Packets              :            1725947945                372178 pps

     Bytes                :          220921336960             381110432 bps

   Transmitted:

     Packets              :            1725947945                372178 pps

     Bytes                :          220921336960             381110432 bps

     Tail-dropped packets :                     0                     0 pps

     RED-dropped packets  :                     0                     0 pps

     RED-dropped bytes    :                     0                     0 bps

 Queue: 2, Forwarding classes: ef1

   Queued:

     Packets              :                     0                     0 pps

     Bytes                :                     0                     0 bps

   Transmitted:

     Packets              :                     0                     0 pps

     Bytes                :                     0                     0 bps

     Tail-dropped packets :                     0                     0 pps

     RED-dropped packets  :                     0                     0 pps

     RED-dropped bytes    :                     0                     0 bps

 Queue: 3, Forwarding classes: nc

   Queued:

     Packets              :                   571                     0 pps

     Bytes                :                 49318                   336 bps

   Transmitted:

     Packets              :                   571                     0 pps

     Bytes                :                 49318                   336 bps

     Tail-dropped packets :                     0                     0 pps

     RED-dropped packets  :                     0                     0 pps

     RED-dropped bytes    :                     0                     0 bps

show interfaces queue both-ingress-egress (Gigabit Ethernet IQ2)

user@host> show interfaces queue ge-6/2/0 both-ingress-egress 

Physical interface: ge-6/2/0, Enabled, Physical link is Up

  Interface index: 175, SNMP ifIndex: 121

Forwarding classes: 8 supported, 4 in use

Ingress queues: 4 supported, 4 in use

Queue: 0, Forwarding classes: best-effort 

  Queued:

    Packets              :                     0                     0 pps

    Bytes                :                     0                     0 bps

  Transmitted:

    Packets              :                   254                     0 pps

    Bytes                :                 16274                     0 bps

    Tail-dropped packets :                     0                     0 pps

    RED-dropped packets  :                     0                     0 pps

    RED-dropped bytes    :                     0                     0 bps

Queue: 1, Forwarding classes: expedited-forwarding 

  Queued:

    Packets              :                     0                     0 pps

    Bytes                :                     0                     0 bps

  Transmitted:

    Packets              :                     0                     0 pps

    Bytes                :                     0                     0 bps

    Tail-dropped packets :                     0                     0 pps

    RED-dropped packets  :                     0                     0 pps

    RED-dropped bytes    :                     0                     0 bps

Queue: 2, Forwarding classes: assured-forwarding 

  Queued:

    Packets              :                     0                     0 pps

    Bytes                :                     0                     0 bps

  Transmitted:

    Packets              :                     0                     0 pps

    Bytes                :                     0                     0 bps

    Tail-dropped packets :                     0                     0 pps

    RED-dropped packets  :                     0                     0 pps

    RED-dropped bytes    :                     0                     0 bps

Queue: 3, Forwarding classes: network-control 

  Queued:

    Packets              :                     0                     0 pps

    Bytes                :                     0                     0 bps

  Transmitted:

    Packets              :                     0                     0 pps

    Bytes                :                     0                     0 bps

    Tail-dropped packets :                     0                     0 pps

    RED-dropped packets  :                     0                     0 pps

    RED-dropped bytes    :                     0                     0 bps

Forwarding classes: 8 supported, 4 in use

Egress queues: 4 supported, 4 in use

Queue: 0, Forwarding classes: best-effort 

  Queued:

    Packets              :                     0                     0 pps

    Bytes                :                     0                     0 bps

  Transmitted:

    Packets              :                     3                     0 pps

    Bytes                :                   126                     0 bps

    Tail-dropped packets :                     0                     0 pps

    RED-dropped packets  :                     0                     0 pps

    RED-dropped bytes    :                     0                     0 bps

Queue: 1, Forwarding classes: expedited-forwarding 

  Queued:

    Packets              :                     0                     0 pps

    Bytes                :                     0                     0 bps

  Transmitted:

    Packets              :                     0                     0 pps

    Bytes                :                     0                     0 bps

    Tail-dropped packets :                     0                     0 pps

    RED-dropped packets  :                     0                     0 pps

    RED-dropped bytes    :                     0                     0 bps

Queue: 2, Forwarding classes: assured-forwarding 

  Queued:

    Packets              :                     0                     0 pps

    Bytes                :                     0                     0 bps

  Transmitted:

    Packets              :                     0                     0 pps

    Bytes                :                     0                     0 bps

    Tail-dropped packets :                     0                     0 pps

    RED-dropped packets  :                     0                     0 pps

    RED-dropped bytes    :                     0                     0 bps

Queue: 3, Forwarding classes: network-control 

  Queued:

    Packets              :                     0                     0 pps

    Bytes                :                     0                     0 bps

  Transmitted:

    Packets              :                     0                     0 pps

    Bytes                :                     0                     0 bps

    Tail-dropped packets :                     0                     0 pps

    RED-dropped packets  :                     0                     0 pps

    RED-dropped bytes    :                     0                     0 bps



Packet Forwarding Engine Chassis Queues:

Queues: 4 supported, 4 in use

Queue: 0, Forwarding classes: best-effort 

  Queued:

    Packets              :              80564692                     0 pps

    Bytes                :            3383717100                     0 bps

  Transmitted:

    Packets              :              80564692                     0 pps

    Bytes                :            3383717100                     0 bps

    Tail-dropped packets :                     0                     0 pps

    RED-dropped packets  :                     0                     0 pps

    RED-dropped bytes    :                     0                     0 bps

Queue: 1, Forwarding classes: expedited-forwarding 

  Queued:

    Packets              :              80564685                     0 pps

    Bytes                :            3383716770                     0 bps

  Transmitted:

    Packets              :              80564685                     0 pps

    Bytes                :            3383716770                     0 bps

    Tail-dropped packets :                     0                     0 pps

    RED-dropped packets  :                     0                     0 pps

    RED-dropped bytes    :                     0                     0 bps

Queue: 2, Forwarding classes: assured-forwarding 

  Queued:

    Packets              :                     0                     0 pps

    Bytes                :                     0                     0 bps

  Transmitted:

    Packets              :                     0                     0 pps

    Bytes                :                     0                     0 bps

    Tail-dropped packets :                     0                     0 pps

    RED-dropped packets  :                     0                     0 pps

    RED-dropped bytes    :                     0                     0 bps

Queue: 3, Forwarding classes: network-control 

  Queued:

    Packets              :                  9397                     0 pps

    Bytes                :               3809052                   232 bps

  Transmitted:

    Packets              :                  9397                     0 pps

    Bytes                :               3809052                   232 bps

    Tail-dropped packets :                     0                     0 pps

    RED-dropped packets  :                     0                     0 pps

    RED-dropped bytes    :                     0                     0 bps

show interfaces queue ingress (Gigabit Ethernet IQ2)

user@host> show interfaces queue ge-6/2/0 ingress

Physical interface: ge-6/2/0, Enabled, Physical link is Up

  Interface index: 175, SNMP ifIndex: 121

Forwarding classes: 8 supported, 4 in use

Ingress queues: 4 supported, 4 in use

Queue: 0, Forwarding classes: best-effort 

  Queued:

    Packets              :                     0                     0 pps

    Bytes                :                     0                     0 bps

  Transmitted:

    Packets              :                   288                     0 pps

    Bytes                :                 18450                     0 bps

    Tail-dropped packets :                     0                     0 pps

    RED-dropped packets  :                     0                     0 pps

    RED-dropped bytes    :                     0                     0 bps

Queue: 1, Forwarding classes: expedited-forwarding 

  Queued:

    Packets              :                     0                     0 pps

    Bytes                :                     0                     0 bps

  Transmitted:

    Packets              :                     0                     0 pps

    Bytes                :                     0                     0 bps

    Tail-dropped packets :                     0                     0 pps

    RED-dropped packets  :                     0                     0 pps

    RED-dropped bytes    :                     0                     0 bps

Queue: 2, Forwarding classes: assured-forwarding 

  Queued:

    Packets              :                     0                     0 pps

    Bytes                :                     0                     0 bps

  Transmitted:

    Packets              :                     0                     0 pps

    Bytes                :                     0                     0 bps

    Tail-dropped packets :                     0                     0 pps

    RED-dropped packets  :                     0                     0 pps

    RED-dropped bytes    :                     0                     0 bps

Queue: 3, Forwarding classes: network-control 

  Queued:

    Packets              :                     0                     0 pps

    Bytes                :                     0                     0 bps

  Transmitted:

    Packets              :                     0                     0 pps

    Bytes                :                     0                     0 bps

    Tail-dropped packets :                     0                     0 pps

    RED-dropped packets  :                     0                     0 pps

    RED-dropped bytes    :                     0                     0 bps

show interfaces queue egress (Gigabit Ethernet IQ2)

user@host> show interfaces queue ge-6/2/0 egress

Physical interface: ge-6/2/0, Enabled, Physical link is Up

  Interface index: 175, SNMP ifIndex: 121

Forwarding classes: 8 supported, 4 in use

Egress queues: 4 supported, 4 in use

Queue: 0, Forwarding classes: best-effort 

  Queued:

    Packets              :                     0                     0 pps

    Bytes                :                     0                     0 bps

  Transmitted:

    Packets              :                     3                     0 pps

    Bytes                :                   126                     0 bps

    Tail-dropped packets :                     0                     0 pps

    RED-dropped packets  :                     0                     0 pps

    RED-dropped bytes    :                     0                     0 bps

Queue: 1, Forwarding classes: expedited-forwarding 

  Queued:

    Packets              :                     0                     0 pps

    Bytes                :                     0                     0 bps

  Transmitted:

    Packets              :                     0                     0 pps

    Bytes                :                     0                     0 bps

    Tail-dropped packets :                     0                     0 pps

    RED-dropped packets  :                     0                     0 pps

    RED-dropped bytes    :                     0                     0 bps

Queue: 2, Forwarding classes: assured-forwarding 

  Queued:

    Packets              :                     0                     0 pps

    Bytes                :                     0                     0 bps

  Transmitted:

    Packets              :                     0                     0 pps

    Bytes                :                     0                     0 bps

    Tail-dropped packets :                     0                     0 pps

    RED-dropped packets  :                     0                     0 pps

    RED-dropped bytes    :                     0                     0 bps

Queue: 3, Forwarding classes: network-control 

  Queued:

    Packets              :                     0                     0 pps

    Bytes                :                     0                     0 bps

  Transmitted:

    Packets              :                     0                     0 pps

    Bytes                :                     0                     0 bps

    Tail-dropped packets :                     0                     0 pps

    RED-dropped packets  :                     0                     0 pps

    RED-dropped bytes    :                     0                     0 bps



Packet Forwarding Engine Chassis Queues:

Queues: 4 supported, 4 in use

Queue: 0, Forwarding classes: best-effort 

  Queued:

    Packets              :              80564692                     0 pps

    Bytes                :            3383717100                     0 bps

  Transmitted:

    Packets              :              80564692                     0 pps

    Bytes                :            3383717100                     0 bps

    Tail-dropped packets :                     0                     0 pps

    RED-dropped packets  :                     0                     0 pps

    RED-dropped bytes    :                     0                     0 bps

Queue: 1, Forwarding classes: expedited-forwarding 

  Queued:

    Packets              :              80564685                     0 pps

    Bytes                :            3383716770                     0 bps

  Transmitted:

    Packets              :              80564685                     0 pps

    Bytes                :            3383716770                     0 bps

    Tail-dropped packets :                     0                     0 pps

    RED-dropped packets  :                     0                     0 pps

    RED-dropped bytes    :                     0                     0 bps

Queue: 2, Forwarding classes: assured-forwarding 

  Queued:

    Packets              :                     0                     0 pps

    Bytes                :                     0                     0 bps

  Transmitted:

    Packets              :                     0                     0 pps

    Bytes                :                     0                     0 bps

    Tail-dropped packets :                     0                     0 pps

    RED-dropped packets  :                     0                     0 pps

    RED-dropped bytes    :                     0                     0 bps

Queue: 3, Forwarding classes: network-control 

  Queued:

    Packets              :                  9538                     0 pps

    Bytes                :               3819840                     0 bps

  Transmitted:

    Packets              :                  9538                     0 pps

    Bytes                :               3819840                     0 bps

    Tail-dropped packets :                     0                     0 pps

    RED-dropped packets  :                     0                     0 pps

    RED-dropped bytes    :                     0                     0 bps

Queued and Transmitted Byte Counts by PIC Type

For the show interfaces queue command output, the byte counts vary by PIC type. Table 18 shows how the byte counts on the outbound interfaces vary depending on the PIC type. Table 18 is based on the assumption that outbound interfaces are sending IP traffic with 478 bytes per packet.

Table 18: Byte Count by PIC Type 
PIC Type
Output Level
Byte Count Includes
Comments

Gigabit Ethernet IQ PIC

Interface

Queued: 490 bytes per packet, representing 478 bytes of Layer 3 packet + 12 bytes

Transmitted: 490 bytes per packet, representing 478 bytes of Layer 3 packet + 12 bytes

RED dropped: 496 bytes per packet representing 478 bytes of Layer 3 packet + 18 bytes

The 12 additional bytes include 6 bytes for the destination MAC address + 4 bytes for the VLAN + 2 bytes for the Ethernet type.

For RED dropped, 6 bytes are added for the source MAC address.

Packet forwarding component

Queued: 478 bytes per packet, representing 478 bytes of Layer 3 packet

Transmitted: 478 bytes per packet, representing 478 bytes of Layer 3 packet


Non-IQ PIC

Interface

Queued: 478 bytes of Layer 3 packet + the full Layer 2 overhead.

Transmitted: 478 bytes of Layer 3 packet + the full Layer 2 overhead.

The Layer 2 overhead is 14 bytes for non-VLAN traffic and 18 bytes for VLAN traffic.

IQ PIC with a SONET/SDH interface

Interface

Queued: 482 bytes per packet, representing 478 bytes of Layer 3 packet + 4 bytes

Transmitted: 482 bytes per packet, representing 478 bytes of Layer 3 packet + 4 bytes

RED dropped: 482 bytes per packet, representing 478 bytes of Layer 3 packet + 4 bytes

The additional 4 bytes are for the Layer 2 Point-to-Point Protocol (PPP) header.

Packet forwarding component

Queued: 478 bytes per packet, representing 478 bytes of Layer 3 packet

Transmitted: 486 bytes per packet, representing 478 bytes of Layer 3 packet + 8 bytes

For transmitted packets, the additional 8 bytes includes 4 bytes for the PPP header and 4 bytes for a cookie.

Non-IQ PIC with a SONET/SDH interface

Interface

Queued: 478 bytes per packet, representing 478 bytes of Layer 3 packet

Transmitted: 483 bytes per packet, representing 478 bytes of Layer 3 packet + 5 bytes

RED dropped: 478 bytes per packet, representing 478 bytes of Layer 3 packet

For transmitted packets, the additional 5 bytes includes 4 bytes for the PPP header and 1 byte for the packet loss priority (PLP).

[Contents] [Prev] [Next] [Index] [Report an Error]