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How to configure the VLAN ACL capture port in Catalyst 6500 series switches

Solution

A port configured to capture VACL-filtered traffic is called a capture port. Additionally, VLAN Access-List (VACL) capture can overcome the SPAN limitation where you can have only two span sessions.

If you want to capture the traffic from one VLAN that goes to many VLANs, the capture port has to be a trunk that carries all the output VLANs because VACL capture cannot send traffic to an interface when a VACL has been applied to several VLANs.

Similarly, for the bridged traffic, because all the traffic remains in the same VLAN, ensure that the capture port is in the same VLAN as the bridged traffic.

Refer to these documents for more information:

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