Configuring Span; Configuring A Span Session - Cisco Nexus 7000 Series Configuration Manual

Configuring SPAN

Configuring SPAN
Cisco NX-OS commands for this feature may differ from those in Cisco IOS.
Note

Configuring a SPAN Session

You can configure a SPAN session on the local device only. By default, SPAN sessions are created in the
shut state.
For sources, you can specify Ethernet ports, port channels, the supervisor inband interface, and VLANs (ingress
only).
A single SPAN session can include mixed sources in any combination of Ethernet ports, VLANs, or the inband
interface to the control plane CPU. You cannot specify Ethernet port subinterfaces as sources for a SPAN
session.
Note • To use a Layer 3 port-channel subinterface as a SPAN source in the monitor session, you must
• When VLANs containing trunk members are configured as SPAN sources, and another set of VLANs
When you specify the supervisor inband interface for a SPAN source, the device monitors all packets that
arrive on the supervisor hardware (ingress).
For destination ports, you can specify Ethernet ports or port channels in either access or trunk mode. You
must enable monitor mode on all destination ports.
For bidirectional traditional sessions, you can configure the sessions without specifying the direction of the
traffic.
For extended SPAN sessions, you can configure the sessions in one of the following ways:
• Configure a bidirectional session by not specifying any direction when you create the session and
• Configure a unidirectional session by specifying the traffic direction when you create the session.
Before You Begin
Make sure you are in the correct VDC. To switch VDCs, use the switchto vdc command.
You must have already configured the destination ports in access or trunk mode. For more information, see
the Cisco Nexus 7000 Series NX-OS Interfaces Configuration Guide.
specify the VLAN ID that you entered when configuring IEEE 802.1Q VLAN encapsulation for the
subinterface as the filter VLAN. When you use the main interface and the SPAN VLAN filter to
filter the 802.1Q VLANs on the subinterfaces, SPAN shows the traffic for all subinterfaces on the
SPAN destination port.
are configured as SPAN VLAN filters, then the unwanted traffic from those filter VLANs can be
potentially captured.
changing the mode to extended by entering the mode extended command.
Cisco Nexus 7000 Series NX-OS System Management Configuration Guide
Configuring SPAN
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