Cisco SR224T Administration Guide - Page 65

Managing Device Diagnostics Configuring Port and VLAN Mirroring 7 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. Packets sent by the switch are mirrored when Transmit (Tx) mirroring is activated. Mirroring does not guarantee that all traffic from the source port(s) is received on the analyzer (destination) port. If more data is sent to the analyzer port than it can support, some data might be lost. Only one instance of mirroring is supported system-wide. The analyzer port (or target port for VLAN mirroring or port mirroring) is the same for all the mirrored VLANs or ports. To enable mirroring: STEP 1 Click Administration > Diagnostics > Port and VLAN Mirroring. The Port and VLAN Mirroring page opens. This page displays the following fields: • Destination Port-Port to which traffic is to be copied; the analyzer port. • Source Interface-Interface, port, or VLAN from which traffic is sent to the analyzer port. • Type-Type of monitoring: incoming to the port (Rx), outgoing from the port (Tx), or both. • Status- Displays one of the following values: - Active-Both source and destination interfaces are up and forwarding traffic. - Not Ready-Either source or destination (or both) are down or not forwarding traffic for some reason. STEP 2 Click Add to add a port or VLAN to be mirrored. The Add Port and VLAN Mirroring page opens. STEP 3 Enter the parameters: • Destination Port-Select the analyzer port to where packets are copied. A network analyzer, such as a PC running Wireshark, is connected to this port. If a port is identified as an analyzer destination port, it remains the analyzer destination port until all entries are removed. • Source Interface-Select the source port or source VLAN from where traffic is to be mirrored. Cisco Small Business 200 Series Smart Switch Administration Guide 66