Cisco Nexus 5500 Series - Monitor Session

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Cisco Nexus 5500 Series NX-OS Layer 2 Interfaces Command Reference
OL-27880-02
Chapter M Commands
monitor session
monitor session
To create a new Ethernet Switched Port Analyzer (SPAN) or an Encapsulated Remote Switched Port
Analyzer (ERSPAN) session configuration for analyzing traffic between ports or add to an existing
session configuration, use the monitor session command. To clear SPAN or ERSPAN sessions, use the
no form of this command.
monitor session {session-number [shut | type {local | erspan-source} | all shut}
no monitor session {session-number | all} [shut]
Syntax Description
Command Default None
Command Modes Global configuration mode
Command History
Usage Guidelines To ensure that you are working with a completely new session, you can clear the desired session number
or all SPAN sessions.
Note The Cisco Nexus device supports two active SPAN sessions. The Cisco Nexus 5548 Switch supports four
active SPAN sessions. When you configure more than two SPAN sessions, the first two sessions are
active. During startup, the order of active sessions is reversed; the last two sessions are active. For
example, if you configured ten sessions 1 to 10 where 1 and 2 are active, after a reboot, sessions 9 and
10 will be active. To enable deterministic behavior, explicitly suspend the sessions 3 to 10 with the
monitor session session-number shut command.
After you create an ERSPAN session, you can describe the session and add interfaces and VLANs as
sources and destinations.
session-number SPAN session to create or configure. The range is from 1 to 18.
all Specifies to apply configuration information to all SPAN sessions.
shut (Optional) Specifies that the selected session will be shut down for
monitoring.
type (Optional) Specifies the type of session to configure.
local Specifies the session type to be local.
erspan-source Creates an ERSPAN source session.
Release Modification
5.2(1)N1(1) This command was introduced.