Cisco Systems A9014CFD manual Span Session, Source Interface, 43-3

Chapter 43 Configuring Switched Port Analyzer

Understanding SPAN

Figure 43-1 Example of Local SPAN Configuration

1 2 3 4 5 6 7 8 9 10 11 12	Port 5 traffic mirrored
	on port 10

	E6 E7		E11
E5	E8
E4		E9	E12
E3			E10

E2

E1

Network analyzer 361283

SPAN does not affect the switching of network traffic that is received on source ports; a copy of the packets that are received by the source ports is still sent to the destination port.

SPAN Session

A local SPAN session is an association of a destination interface with a set of source interfaces. You configure SPAN sessions using parameters that specify the type of network traffic to monitor. SPAN sessions allow you to monitor traffic on one or more interfaces and to send either ingress traffic, egress traffic, or both to one destination interface. You can configure a SPAN session with separate sets of SPAN source interfaces or VLANs; overlapping sets are not supported.

SPAN sessions do not interfere with the normal operation of the switch. The show monitor session all command displays the operational status of a SPAN session.

A SPAN session remains inactive after system power-up until the destination interface is operational.

Source Interface

A source interface (also called a monitored interface) is an interface monitored for network traffic analysis.

A source interface has these characteristics:

•A single VLAN, EFP, or port-channel source per session is supported for ingress.

•A single physical source port is supported for ingress and egress.

•A maximum of five physical ports can be used in a single session for ingress SPAN (Rx).

•When an interface is configured as a destination interface, it cannot be configured as a source interface.

	Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09		43-3