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show system connections

date_range 12-Sep-24

Syntax

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show system connections 
<extensive> 
<inet | inet6> 
<show-routing-instances>

Syntax (EX Series)

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show system connections 
<extensive> 
<all-members>
<inet | inet6> 
<local>
<member member-id> 
<show-routing-instances>

Syntax (MX Series Router)

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show system connections 
<extensive> 
<all-members>
<inet | inet6> 
<local>
<member member-id> 
<show-routing-instances>

Syntax (QFX Series)

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show system connections 
<extensive> 
<inet> 
<infrastructure name> 
<interconnect-device name> 
<node-group name> 
<show-routing-instances>

Syntax (OCX Series)

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show system connections 
<extensive> 
<inet> 
<show-routing-instances>

Syntax (Junos OS Evolved)

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show system connections 
<inet | inet6> 
<node node-name>

Description

Display information about the active IP sockets on the Routing Engine. Use this command to verify which servers are active on a system and what connections are currently in progress.

Options

The following table lists all possible options for the show system connections command. The options that appear may vary depending on the platform and software release.

none	Display information about all active IP sockets on the Routing Engine.
extensive	(Optional) Display exhaustive system process information, which, for TCP connections, includes the TCP control block and maximum segment size (MSS). This option is useful for debugging TCP connections.
all-members	(Optional) Display system connection activity for all members of the Virtual Chassis configuration.
inet \| inet6	(Optional) Display IPv4 connections or IPv6 connections, respectively.
infrastructure `name`	(QFabric systems only) (Optional) Display system connection activity for the fabric control Routing Engines or fabric manager Routing Engines.
interconnect-device `name`	(QFabric systems only) (Optional) Display system connection activity for the Interconnect device.
local	(Optional) Display system connection activity for the local Virtual Chassis member.
member `member-id`	(Optional) Display system connection activity 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 `node-name`	(Optional) Display system connection activity for the specified node.
node-group `name`	(QFabric systems only) (Optional) Display system connection activity for the Node group.
show-routing-instances	(Optional) Display routing instances.

Additional Information

Note:

The device calculates the TCP MSS value as described in RFC 6691.

Required Privilege Level

view

Output Fields

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

Table 1: show system connections Output Fields
Field Name	Field Description
`Proto`	Protocol of the socket: `IP`, `TCP`, or `UDP` for IPv4 or IPv6.
`Recv-Q`	Number of input bytes received by the protocol and waiting to be processed by the application.
`Send-Q`	Number of output bytes sent by the application and waiting to be processed by the protocol.
`Local Address`	Local address and port of the socket, separated by a period. An asterisk (`*`) indicates that the bound address is the wildcard address. Server sockets typically have the wildcard address and a well-known port bound to them.
`Foreign Address`	Foreign address and port of the socket, separated by a period. An asterisk (`*`) indicates that the address or port is a wildcard.
`Routing Instance`	(Displayed only when the `show-routing-instance` option is used.) Routing instances associated with active IP sockets on the Routing Engine.
`(state)`	For TCP, the protocol state of the socket.

Sample Output

show system connections
show system connections extensive
show system connections show-routing-instances
show system connections | find sctp