Dell PowerSwitch S4128F-ON OS10 Enterprise Edition User Guide Release 10.4.1.0 - Page 257
Session and VLAN requirements, Reserved L2 VLAN, Source session
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Session and VLAN requirements Remote port monitoring requires a source session (monitored ports on different source devices), a reserved tagged VLAN for transporting monitored traffic (configured on source, intermediate, and destination devices), and a destination session (destination ports connected to analyzers on destination devices). • Configure any network device with source ports and destination ports and enable it to function in an intermediate transport session for a reserved VLAN at the same time for multiple remote port monitoring sessions. Enable and disable individual monitoring sessions. • A remote port monitoring session mirrors monitored traffic by prefixing the reserved VLAN tag to monitored packets to transmit using the reserved VLAN. • The source address, destination address, and original VLAN ID of the mirrored packet are prefixed with the tagged VLAN header. Untagged source packets are tagged with the reserved VLAN ID. • The member port of the reserved VLAN must have the MTU and IPMTU value as MAX+4 (to hold the VLAN tag parameter). • To associate with source session, the reserved VLAN can have a maximum of four member ports. • To associate with destination session, the reserved VLAN can have multiple member ports. • The reserved VLAN cannot have untagged ports. Reserved L2 VLAN • MAC address learning in the reserved VLAN is automatically disabled. • There is no restriction on the VLAN IDs used for the reserved remote monitoring VLAN. Valid VLAN IDs are from 2 to 4093. The default VLAN ID is not supported. • In monitored traffic, packets that have the same destination MAC address as an intermediate or destination device in the path used by the reserved VLAN to transport the mirrored traffic are dropped by the device that receives the traffic if the device has a L3 VLAN configured. Source session • Configure physical ports and port-channels as sources in remote port monitoring and use them in the same source session. You can use both L2 (configured with the switchport command) and L3 ports as source ports. Optionally configure one or more source VLANs to configure the VLAN traffic to be monitored on source ports. • Use the default VLAN and native VLANs as a source VLAN. • You cannot configure the dedicated VLAN used to transport mirrored traffic as a source VLAN. Layer 2 257