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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.
Important:
When configuring ERPM, follow these guidelines:
• The Dell Networking OS supports ERPM source sessions only. Encapsulated packets terminate at
the destination IP address or at the analyzer.
• You can configure up to four ERPM source sessions on the switch.
• You can configure any port as a source port in an ERPM session.
• The maximum number of source ports that can be defined in a session is 128.
• Make sure that the destination IP address is reachable via the configured IP route (static or
dynamic)
• The system MTU should be configured properly to accommodate the increased size of the
ERPM mirrored packet.
• 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.
• The source IP address can be any port's ip address defined in the box but it should be unique
and should not be assigned to any other system in the network.
• You must specify the keyword monitor in the ACL rules used on a source interface (as shown in
one of the examples following the configuration procedure).
• 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.
• A flow-based source VLAN can be monitored only for ingress traffic (not egress traffic).
To configure an ERPM session:
Step Command Description
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
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 mulitple source
statements in an ERPM monitoring
session.
5
erpm source-ip-address dest-ip-
address
Specify the source IP address and the
destination IP address to which
encapsulated mirrored traffic is sent.
696
Port Monitoring