Administrator Guide

• The Dell EMC 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.
• 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 70. Configuration steps for ERPM
Step Command Purpose
1
configure terminal
Enter global configuration mode.
2
monitor session <id> 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
{rx | tx | both}
Specify the source port or range of ports. Specify the
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 <id> dest-ip <id> gre-
protocol <value>
Specify the source IP address, destination IP address,
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.
6
no disable
Enter the no disable command to enable the ERPM
session.
The following example shows an ERPM configuration:
The next example shows the configuration of an ERPM session in which VLAN 11 is monitored as the source interface and a MAC ACL
filters the monitored ingress traffic.
Port Monitoring on VLT
Devices on which VLT is configured are seen as a single device in the network. You can apply port monitoring function on the VLT devices
in the network.
Port monitoring enables ingress or egress traffic traversing on a port to be sent to another port so that the traffic can be analyzed. The
port to which traffic is sent for analysis is called the mirroring port. This port is connect to a port analyzer, which performs the traffic
analysis function.
Depending up on the location of the port to which the port analyzer is connected, port monitoring is classified into three categories: local
Port mirroring, remote port mirroring (RPM), and encapsulated remote port mirroring (ERPM).
NOTE: For more information on port monitoring, see Port Monitoring.
712 Port Monitoring