Encapsulated Remote Port MonitoringEncapsulated Remote Port Monitoring (ERPM) copies traffic from source ports/port-channels or sourceVLANs and forwards the traffic using routable GRE-encapsulated packets to the destination IP addressspecified in the session.Important:When configuring ERPM, follow these guidelines• The Dell Networking OS supports ERPM source session only. Encapsulated packets terminate atthe destination IP address or at the analyzer.• You can configure up to four ERPM source sessions on switch.• The system MTU should be configured properly to accommodate the increased size of theERPM mirrored packet.• The maximum number of source ports that can be defined in a session is 128.• The system encapsulates the complete ingress or egress data under GRE header, IP header andouter MAC header and sends it out at the next hop interface as pointed by the routing table.• The keyword ‘flow-based enable’ should have been specified in case of source as vlan or wheremonitoring on a per flow basis is desired.• The keyword monitor should have been specified in the access list rules for which we need tomirror.• The maximum number of source ports that can be defined in a session is 128.• The system allows to configure upto 4 ERPM sessions.• ERPM sessions do not copy locally sourced remote VLAN traffic from source trunk ports thatcarry RPM VLANs. ERPM sessions do not copy locally sourced ERPM GRE-encapsulated trafficfrom source ports.• Source Vlan monitoring can be done only for ingress packets and is not supported for egressdirection.• A flow-based source VLAN can be monitored only for ingress traffic (not egress traffic).direction.Changes to Default Behavior• Rate-limiting ïs no longer done for ERSPAN traffic.• Same port can be configured as both source and destination in an ERSPAN session.• TTL and ToS values can be configured in IP header of ERSPAN traffic.Configuration steps for ERPMTo configure an ERPM session:Table 65. Configuration steps for ERPMStep Command Purpose1 configure terminal Enter global configuration mode.2 monitor session type erpm Specify a session ID and ERPM as the typeof monitoring session, and enterMonitoring-Session configuration mode.690 Port Monitoring
