Concept Guide

Encapsulated Remote Port Monitoring
Encapsulated Remote Port Monitoring (ERPM) copies trac from source ports/port-channels or source VLANs and forwards the trac
using routable GRE-encapsulated packets to the destination IP address specied in the session.
NOTE:
When conguring ERPM, follow these guidelines
• The Dell EMC Networking OS supports ERPM source session only. Encapsulated packets terminate at the destination IP address
or at the analyzer.
• You can congure up to four ERPM source sessions on switch.
• Congure the system MTU to accommodate the increased size of the ERPM mirrored packet.
• The maximum number of source ports you can dene 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-ow basis.
• Specify the monitor keyword in the access list rules for which you want to mirror.
• The system allows you to congure up to four ERPM sessions.
• ERPM sessions do not copy locally sourced remote VLAN trac from source trunk ports that carry RPM VLANs. ERPM sessions
do not copy locally sourced ERPM GRE-encapsulated trac from source ports.
• Flow-based mirroring is supported only for source VLAN ingress trac.
Changes to Default Behavior
• Rate-limiting is supported for the ERSPAN trac.
• You can congure the same port as both source and destination in an ERSPAN session.
• You can congure TTL and TOS values in the IP header of the ERSPAN trac.
Conguration steps for ERPM
To congure an ERPM session:
Table 70.
Conguration steps for ERPM
Step Command Purpose
1
configure terminal
Enter global conguration mode.
2
monitor session <id> type erpm
Specify a session ID and ERPM as the type of
monitoring session, and enter the Monitoring-Session
conguration mode. The session number needs to be
unique and not already dened.
3
source { interface | range } direction
{rx | tx | both}
Specify the source port or range of ports. Specify the
ingress (rx), egress (tx), or both ingress and egress
trac to be monitored. You can enter multiple source
statements in an ERPM monitoring session
4
erpm source-ip <id> dest-ip <id> gre-
protocol <value>
Specify the source IP address, destination IP address,
and GRE-protocol type value to which encapsulated
mirrored trac is sent.
5
no flow-based enable
ERPM to be performed on a ow-by-ow basis or if you
congure a VLAN source interface. Enter the no
flow-based command to disable ow-based ERPM.
Port Monitoring 747