What is VLAN mirroring?

What is VLAN mirroring?

The VLAN-based mirroring feature allows users to monitor all incoming traffic in one or more VLANs by sending a mirror image of that traffic to a configured mirror port. This feature meets the requirements of CALEA (Communications Assistance for Law Enforcement Act of 1994).

Do unmanaged switches carry VLAN tags?

An unmanaged switch will only have one VLAN. Some unmanaged switches will drop tagged frames as damaged, others will strip the tag, and some will simply pass the frames unchanged. Unless you try it, you have no way to know how your switch acts.

How do you mirror a VLAN?

To configure port and VLAN mirroring: Click Administration > Diagnostics > Port and VLAN Mirroring. If your switch supports the RSPAN VLAN feature, enter the following information: RSPAN VLAN—Check Enable to enable RSPAN VLAN mirroring.

What is VLAN tagging for?

Virtual Local Area Networks, or VLANs, segregate traffic within a network. VLANs keep traffic from different networks separated when traversing shared links and devices within a topology. This process, also known as VLAN tagging, is invaluable to limiting broadcast network traffic, and securing network segments.

Where does mirroring take place on a VLAN?

A packet that is received on a network port assigned to a VLAN that is subject to mirroring is mirrored to the analyzer port even if the packet was eventually trapped or discarded.

Can a destination port be used for mirroring?

Except for traffic that is required for the mirroring, the destination port can also be used to receive or forward normal traffic. A packet that is received on a network port assigned to a VLAN that is subject to mirroring is mirrored to the analyzer port even if the packet was eventually trapped or discarded.

Which is port based and which is VLAN based?

Local Port Based—Copies TX, RX, or both TX and RX traffic from each port to the destination port. Local VLAN Based—Copies traffic from the local VLAN to the destination port. RSPAN Source Session—Utilizes a VLAN to copy traffic from a source port or a source VLAN to another device.