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What is NIC pairing and how do I configure NIC
pairing on my Email Security Appliance (ESA)?
Document ID: 118143
Contributed by Jai Gill and Stephan Bayer, Cisco TAC Engineers.
Aug 05, 2014
Contents
Question:
Answer:
Question:
 What is NIC pairing and how do I configure NIC pairing on my Email Security Appliance (ESA)?
Answer:
NIC pairing configures the Ethernet interfaces so that there is a primary interface and a backup interface. If
the primary interface fails, the secondary interface becomes active and sends an alert.
WARNING: Enabling NIC pairing deletes all listeners assigned to the secondary interface.
The etherconfig command enables NIC pairing:
  mail3.example.com> etherconfig
  Ethernet interfaces:
  1. Data 1 (Autoselect: 100baseTX full−duplex)
  2. Data 2 (Autoselect: 100baseTX full−duplex)
  3. Management (Autoselect: 100baseTX full−duplex)
  Choose the operation you want to perform:
  − EDIT − Edit an ethernet interface.
  − PAIRING − Configure pairing.
  []> pairing
  Enter the name or number of the primary ethernet interface you wish to
  pair. []> 1
  Warning: The Backup (Data 2) for the NIC Pair has one or more currently
  configured listeners using it. If you continue, all listeners configured
  to use the Data 2 interface will be deleted.
  Do you want to continue?  [N]> y