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show system buffers

Syntax

Syntax (EX Series)

Syntax (TX Matrix Router)

Syntax (TX Matrix Plus Router)

Syntax (MX Series Router)

Syntax (QFX Series)

Description

Display information about the buffer pool that the Routing Engine uses for local traffic. Local traffic is the routing and management traffic that is exchanged between the Routing Engine and the Packet Forwarding Engine within the router or switch, as well as the routing and management traffic from IP (that is, from OSPF, BGP, SNMP, ping operations, and so on).

Options

none

Show all buffer statistics.

all-lcc

(TX Matrix routers and TX Matrix Plus routers only) (Optional) On a TX Matrix router, show buffer statistics for all T640 routers connected to the TX Matrix router. On a TX Matrix Plus router, show buffer statistics for all routers connected to the TX Matrix Plus router.

all-chassis

(TX Matrix routers and TX Matrix Plus routers only) (Optional) Show buffer statistics for all of the chassis.

all-members

(EX4200 switches and MX Series routers only) (Optional) Show buffer statistics for all members of the Virtual Chassis configuration.

infrastructure name

(QFabric systems only) (Optional) Show buffer statistics for a fabric control Routing Engine or a fabric control Routing Engine.

interconnect-device name

(QFabric systems only) (Optional) Show buffer statistics for the Interconnect device.

lcc number

(TX Matrix routers and TX Matrix Plus routers only) (Optional) On a TX Matrix router, show buffer statistics for a specific T640 router (or line-card chassis) that is connected to the TX Matrix router. On a TX Matrix Plus router, show buffer statistics for a specific router (line-card chassis) that is connected to the TX Matrix Plus router.

Replace number with the following values depending on the LCC configuration:

  • 0 through 3, when T640 routers are connected to a TX Matrix router in a routing matrix.

  • 0 through 3, when T1600 routers are connected to a TX Matrix Plus router in a routing matrix.

  • 0 through 7, when T1600 routers are connected to a TX Matrix Plus router with 3D SIBs in a routing matrix.

  • 0, 2, 4, or 6, when T4000 routers are connected to a TX Matrix Plus router with 3D SIBs in a routing matrix.

local

(EX4200 switches and MX Series routers only) (Optional) Show buffer statistics for the local Virtual Chassis member.

member member-id

(EX4200 switches and MX Series routers only) (Optional) Show buffer statistics for the specified member of the Virtual Chassis configuration. For EX4200 switches, replace member-id with a value from 0 through 9. For an MX Series Virtual Chassis, replace member-id with a value of 0 or 1.

node-group name

(QFabric systems only) (Optional) Show buffer statistics for the Node group

sfc

(TX Matrix Plus routers only) (Optional) Show buffer statistics for the TX Matrix Plus router. Replace number with 0.

Additional Information

By default, when you issue the show system buffers command on the primary Routing Engine of a TX Matrix router or a TX Matrix Plus router, the command is broadcast to all the primary Routing Engines of the LCCs connected to it in the routing matrix. Likewise, if you issue the same command on the backup Routing Engine of a TX Matrix or a TX Matrix Plus router, the command is broadcast to all backup Routing Engines of the LCCs that are connected to it in the routing matrix.

A special type of memory buffer called a cluster is 2 KB in size. For more information, see The Design and Implementation of the 4.4BSD Operation System by McKusic, Bostic, Karels, and Quarterman.

Required Privilege Level

view

Output Fields

Table 1 describes the output fields for the show system buffers command. Output fields are listed in the approximate order in which they appear.

Table 1: show system buffers Output Fields

Field Name

Field Description

mbufs in use

Memory buffers (mbufs) are 128-byte buffers that are used for various purposes inside the kernel. Each memory buffer has a type, and the output itemizes the amount allocated for each type. Types with no memory buffers allocated are not displayed.

mbufs allocated to packet headers

Number of memory buffers currently holding packet headers

mbufs allocated to control blocks

Number of memory buffers currently holding the state for sockets.

mbufs allocated to send data

Number of memory buffers currently holding socket send data.

mbufs allocated to pfe refill data

Number of memory buffers currently holding Packet Forwarding Engine refill data.

mbufs allocated to fxp data

Number of memory buffers currently holding fxp data.

mbufs allocated to socket names and addresses

Number of memory buffers currently holding addresses for sockets.

mbuf clusters in use

Allocation statistics for memory buffer clusters.

allocated to network

Total amount of memory in use by the networking and interprocess communication (IPC) code.

requests for memory denied

Number of times a memory allocation request within the IPC and networking code failed.

requests for memory delayed

Number of times a memory allocation request within the IPC and networking code was postponed.

calls to protocol drain routines

Number of times a memory allocation request within the IPC and networking code triggered a memory reclamation attempt.

Sample Output

show system buffers

show system buffers scc (TX Matrix Router)

show system buffers sfc (TX Matrix Plus Router)

show system buffers all-chassis (TX Matrix Plus Router)

show system buffers node-group (QFabric System)

Release Information

Command introduced before Junos OS Release 7.4.

sfc option introduced for the TX Matrix Plus router in Junos OS Release 9.6.