Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.112.0P1 - Page 680
Encapsulated Remote Port Monitoring
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Encapsulated Remote Port Monitoring Encapsulated Remote Port Monitoring (ERPM) copies traffic from source ports/port-channels or source VLANs and forwards the traffic using routable GRE-encapsulated packets to the destination IP address specified in the session. NOTE: When configuring ERPM, follow these guidelines • The Dell Networking OS supports ERPM source session only. Encapsulated packets terminate at the destination IP address or at the analyzer. • You can configure up to four ERPM source sessions on switch. • Configure the system MTU to accommodate the increased size of the ERPM mirrored packet. • The maximum number of source ports you can define in a session is 128. • The system encapsulates the complete ingress or egress data under GRE header, IP header, and outer MAC header and sends it out at the next hop interface as pointed by the routing table. • Specify flow-based enable in case of source as VLAN or where you need monitoring on a per-flow basis. • Specify the monitor keyword in the access list rules for which you want to mirror. • The system allows you to configure up to four ERPM sessions. • ERPM sessions do not copy locally sourced remote VLAN traffic from source trunk ports that carry RPM VLANs. ERPM sessions do not copy locally sourced ERPM GRE-encapsulated traffic from source ports. • Flow-based mirroring is supported only for source VLAN ingress traffic. Changes to Default Behavior • Rate-limiting is supported for the ERSPAN traffic. • You can configure the same port as both source and destination in an ERSPAN session. • You can configure TTL and TOS values in the IP header of the ERSPAN traffic. Configuration steps for ERPM To configure an ERPM session: Table 68. Configuration steps for ERPM Step Command Purpose 1 configure terminal Enter global configuration mode. 2 monitor session type erpm Specify a session ID and ERPM as the type of monitoring session, and enter the Monitoring-Session configuration mode. The session number needs to be unique and not already defined. 3 source { interface | range } direction Specify the source port or range of ports. Specify the {rx | tx | both} ingress (rx), egress (tx), or both ingress and egress traffic to be monitored. You can enter multiple source statements in an ERPM monitoring session 4 erpm source-ip dest-ip gre- Specify the source IP address, destination IP address, protocol and GRE-protocol type value to which encapsulated mirrored traffic is sent. 5 no flow-based enable ERPM to be performed on a flow-by-flow basis or if you configure a VLAN source interface. Enter the no flow-based command to disable flow-based ERPM. 680 Port Monitoring
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