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Catalyst 3750 Switch Software Configuration Guide
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Chapter 27 Configuring SPAN and RSPAN
Configuring SPAN and RSPAN
A physical port that belongs to an EtherChannel group can be configured as a SPAN source port and
still be a part of the EtherChannel. In this case, data from the physical port is monitored as it
participates in the EtherChannel. However, if a physical port that belongs to an EtherChannel group
is configured as a SPAN destination, it is removed from the group. After the port is removed from
the SPAN session, it rejoins the EtherChannel group. Ports removed from an EtherChannel group
remain members of the group, but they are in the inactive or standalone state.
If a physical port that belongs to an EtherChannel group is a destination port and the EtherChannel
group is a source, the port is removed from the EtherChannel group and from the list of monitored
ports.
• Multicast traffic can be monitored. For egress and ingress port monitoring, only a single unedited
packet is sent to the SPAN destination port. It does not reflect the number of times the multicast
packet is sent.
• A private-VLAN port cannot be a SPAN destination port.
• A secure port cannot be a SPAN destination port.
For SPAN sessions, do not enable port security on ports with monitored egress when ingress
forwarding is enabled on the destination port. For RSPAN source sessions, do not enable port
security on any ports with monitored egress.
• An 802.1x port can be a SPAN source port. You can enable 802.1x on a port that is a SPAN
destination port; however, 802.1x is disabled until the port is removed as a SPAN destination.
For SPAN sessions, do not enable 802.1x on ports with monitored egress when ingress forwarding
is enabled on the destination port. For RSPAN source sessions, do not enable 802.1x on any ports
that are egress monitored.
SPAN and RSPAN and Switch Stacks
Because the stack of switches is treated as one logical switch, local SPAN source ports and destination
ports can be in different switches in the stack. Therefore, the addition or deletion of switches in the stack
can affect a local SPAN session, as well as an RSPAN source or destination session. An active session
can become inactive when a switch is removed from the stack or an inactive session can become active
when a switch is added to the stack.
For more information about switch stacks, see Chapter 5, “Managing Switch Stacks.”
Configuring SPAN and RSPAN
This section describes how to configure SPAN on your switch. It contains this configuration information:
• Default SPAN and RSPAN Configuration, page 27-11
• Configuring Local SPAN, page 27-11
• Configuring RSPAN, page 27-17
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