This document describes the relationship between the VLAN ID seen in Ethanalyzer traces and the VLAN ID on a Cisco Nexus 5000 Series Switch.
Cisco recommends that you have knowledge of these topics:
Knowledge of Cisco NX-OS CLI
Knowledge of Fibre Channel over Ethernet (FCoE)
The information in this document is based on Cisco Nexus 5000 and 5500 Series Switches.
The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command.
What is the difference between the VLAN ID displayed in the NX-OS Ethanalyzer and the VLAN ID on a Cisco Nexus 5000 Series Switch?
Ethanalyzer does not show the actual FCoE VLAN ID in the VID field of the 802.1q header. This section shows traces of two FCoE connections. The Qlogic CNA uses FCoE VLAN/VSAN 100, and the Cisco P81E (Monterey Park Adapter) uses FCoE VLAN/VSAN 30. The trace shows a VID of 13 and 14 respectively.
QLOGIC FIP Keepalives (Configured for FCoE VLAN/VSAN 100)
Monterey Park (P81e) FIP Solicitation (Configured for FCoE VLAN/VSAN 30)
Ethanalyzer will not show the actual decimal VLAN ID value that you would see in an inline trace. Ethanalyzer shows the N5K internal Canonical VLAN ID (CVID) value. Here is one way to map it back: