Contents
Introduction
Topology
Determine the Ingress Forwarding Engine
Configure the Trigger
Start the Capture
Interpret the Results
Additional Verification
Introduction
This document describes the steps used in order to perform an ELAM on Cisco Nexus 7700
(N7700) M3 modules, explains the most relevant outputs, and describes how to interpret the
results.
Tip: Refer to the
ELAM Overview
document for an overview on ELAM.
Topology
In this example, a host on VLAN 2500 (10.0.5.101), port Eth4/1 sends an Internet Control
Message Protocol (ICMP) request to a host on VLAN 55 (10.0.3.101), port Eth3/5. ELAM is used
in order to capture this single packet from 10.0.5.101 to 10.0.3.101. It is important to remember
that ELAM allows you to capture a single frame.
In order to perform an ELAM on the N7K, you must first connect to the appropriate module (this
requires the network-admin privilege):
N7700# attach module 4
Attaching to module 4 ...
module-4#
Determine the Ingress Forwarding Engine
Traffic is expected to ingress the switch on port Eth4/1. When you check the modules in the
system, you see that Module 4 is an M3 module. It is important to remember that the N7K is fully-
distributed, and that the modules, not the supervisor, make the forwarding decisions for dataplane
