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Cisco ME 3400 EthernetAccess Switch SoftwareConfiguration Guide
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Chapter24 Configuring SPAN and RSPAN Configuring SPAN and RSPAN
•EtherChannel—You can configure an EtherChannel group as a source port but not as a SPAN
destination port. When a group is configured as a SPAN source, the entire group is mo nit ored.
If a physical port is added to a monitored EtherChannel gr oup, t h e new por t is added t o t he SPAN
source port list. If a port is removed from a monitored EtherChannel group, it is automatically
removed from the source port list.
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 grou p
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 suspended state.
If a physical port that belongs to an EtherChannel group is a destination p ort and the EtherChannel
group is a source, the port is removed from the EtherChannel group and fro m t he l ist of mo nito re d
ports.
•Multicast traffic can be monitored. For sending and receiving port monitoring, only a single
unedited packet is sent to the SPAN destination port. It does not reflect the number of times that 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 IEEE 802.1x port can be a SPAN source port. You can enable IEEE 802.1x on a port that is a
SPAN destination port; however, IEEE 802.1x is disabled until the port is removed as a SPAN
destination.
For SPAN sessions, do not enable IEEE 802.1x on ports with monitored sending when receive
forwarding is enabled on the destination port. For RSPAN source sessions, do not enable
IEEE 802.1x on any ports that are sending monitored.
Configuring SPAN and RSPAN
These sections contain this configuration information:
•Default SPAN and RSPAN Configuration, page 24-10
•Configuring Local SPAN, page 24-10
•Configuring RSPAN, page 24-16