Feature Incompatiblities - Cisco 7604 Configuration Manual
Ios software configuration guide
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Chapter 52
Configuring Local SPAN, RSPAN, and ERSPAN
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To avoid disrupting traffic, do not oversubscribe any of these points in your SPAN topology. Some
oversubscription and performance considerations are:
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Feature Incompatiblities
These feature incompatibilities exist with local SPAN, RSPAN, and ERSPAN:
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SPAN destination ports can participate in IEEE 802.3Z Flow Control.
Note
OL-4266-08
Fabric channel
Rewrite/replication engine
Forwarding engine (PFC/DFC)
SPAN doubles traffic internally
SPAN adds to the traffic being processed by the switch fabric
SPAN doubles forwarding engine load
The supervisor engine handles the entire load imposed by egress SPAN (also called transmit SPAN).
Egress SPAN should only be enabled for short periods of time during active troubleshooting
Note
The ingress modules handle the load imposed by ingress SPAN sources (also called receive SPAN)
on each module. Ingress SPAN adds to rewrite/replication engine load.
Egress SPAN is not supported in egress multicast mode. (CSCsa95965)
With a PFC3, EoMPLS ports cannot be SPAN sources. (CSCed51245)
A port-channel interface (an EtherChannel) can be a SPAN source, but you cannot configure active
member ports of an EtherChannel as SPAN source ports. Inactive member ports of an EtherChannel
can be configured as SPAN sources but they are put into the suspended state and carry no traffic.
With releases earlier than Release 12.2(33)SXH, a port-channel interface (an EtherChannel) cannot
be a SPAN destination.
You cannot configure active member ports of an EtherChannel as SPAN destination ports. Inactive
member ports of an EtherChannel can be configured as SPAN destination ports but they are put into
the suspended state and carry no traffic.
Because SPAN destination ports drop ingress traffic, these features are incompatible with SPAN
destination ports:
Private VLANs
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IEEE 802.1X port-based authentication
Port security
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Spanning tree protocol (STP) and related features (PortFast, PortFast BPDU Filtering, BPDU
Guard, UplinkFast, BackboneFast, EtherChannel Guard, Root Guard, Loop Guard)
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VLAN trunk protocol (VTP)
Dynamic trunking protocol (DTP)
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IEEE 802.1Q tunneling
Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
Local SPAN, RSPAN, and ERSPAN Configuration Guidelines and Restrictions
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