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Sample Configuration - Network Load Balancing (NLB) Multicast mode over routed subnet - Cisco Switch Static ARP Configuration

Purpose

 NLB Multicast Mode – Static ARP Resolution

  • Since NLB packets are unconventional, meaning the IP address is Unicast while the MAC address of it is Multicast, switches and routers drop NLB packets
  • NLB Multicast Packets get dropped by routers and switches, causing the ARP tables of switches to not get populated with cluster IP and MAC address
  • Manual ARP Resolution of NLB cluster address is required on physical switch and router interfaces
  • Cluster IP and MAC static resolution is set on each switch port that connects to ESX host
  • Virtual Switch NIC Team Policy > Notify Switches is set to Yes.
  • If CDP (Cisco Discovery Protocol) is Enabled on ESX and the Cisco Switch - you can determine proper switch ports connecting to ESX via the Virtual Infrastructure Client

Resolution

 
 
To configure the switch:
  1. Telnet in to Cisco Switch Console and log in.
  2. Run the following command to enter Configuration mode:

    config t

  3. STATIC ARP RESOLUTION Cisco Global command mode

    For example:
    arp [ip] [cluster multicast mac] ARPA
    arp 192.168.1.100 03bf.c0a8.0164 ARPA


  4. STATIC MAC RESOLUTION Cisco Global command mode

    For example:
    mac-address-table static [cluster multicast mac] [vlan id] [interface]
    mac-address-table static 03bf.c0a8.0164 vlan 1 interface GigabitEthernet1/1 GigabitEthernet1/2
    GigabitEthernet1/15 GigabitEthernet1/16

Additional Information

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