Connectivity Guide

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Remote port monitoring
Remote port monitoring monitors ingress and/or egress trac on multiple source ports of multiple devices and forwards the monitored
trac to multiple destination ports on dierent remote devices. Remote port monitoring helps network administrators monitor and analyze
trac to troubleshoot network problems.
In a remote port monitoring session, monitored trac is tagged with a VLAN ID and switched on a user-dened, non-routable L2 VLAN.
The VLAN is reserved to carry only monitored trac, which is forwarded on all egress ports of the VLAN. You must congure each
intermediate switch that participates in transporting monitored trac with the reserved L2 VLAN. Remote port monitoring supports
monitoring sessions where multiple source and destination ports distribute across multiple network devices.
Session and VLAN requirements
RPM requires the following:
• Source session, such as monitored ports on dierent source devices.
• Reserved tagged VLAN for transporting monitored trac congured on source, intermediate, and destination devices.
• Destination session, where destination ports connect to analyzers on destination devices.
Congure any network device with source and destination ports. Enable the network device to function in an intermediate transport
session for a reserved VLAN for multiple remote port monitoring sessions. You can enable and disable individual monitoring sessions.
Consider the following when conguring a RPM session:
• A remote port monitoring session mirrors monitored trac by prexing 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 prexed 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 the source session, the reserved VLAN can have up to four member ports.
• To associate with the destination session, the reserved VLAN can have multiple member ports.
• The reserved VLAN cannot have untagged ports.
Layer 2
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