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An IPv6 Address can be configured on VX900C in one of the following ways:

  1. Auto-configured Address
  2. Static Address

IPv6 Address - Auto-configuration

The VX900C can be configured to assign an IPv6 address automatically based on the values of the Router’s Prefix and the adapter’s MAC Address. This procedure is known as Auto-configuration.

For detailed information about setting up the VX900C to perform Auto-configuration, see Setting Up IP Interfaces.

How Auto-configuration is Applied

The following steps outline the auto-configuration process within the VX:

Step 1: Auto-configured Address obtained

  • When Auto-configuration is enabled on an interface, from that interface, the VX sends a Router Solicitation (RS) to get the Router Advertisement (RA) in that network. If the Router Prefix is received from Router Advertisement, it is linked with the Adapter’s MAC Address to generate the Auto-configured address.

Step 2: Auto-configured Address is applied

  • Duplicate Address Detection (DAD) is performed over the network for the generated Auto-configured Address. For detailed information about setting the DAD configuration, see Ethernet Adapters.
  • If the Duplicate Address exists in the network, the Auto-configured address is blocked and not applied to that particular interface/adapter and an alarm is generated in the CLI. As a result, only a Manual IP address (which doesn’t exist in the network) can be assigned for that interface. DAD is performed again with the manually configured new address. If this address also exists in the network, another manual address should be configured and the same process continues until a unique address is found in the network.
  • If another entity in the network attempts to apply the VX’s IPv6 Address (while the DAD is being performed), the VX reports that the IP is existing in the network for that MAC address.

After Auto-configuration is Applied - Points to Remember

  • IP address generation may take some time.
  • After the interface IP address is assigned, the configuration needs to be received back into the VXbuilder. This is to ensure that next time the configuration is transmitted, Auto-configuration is not performed. After the configuration is received, the IP address is shown in VXbuilder.
  • If the VX has blocked an IP due to finding the duplicate address in the network while configuring the address to the interface, it deletes the duplicate address in the network and transmits the same configuration (i.e no changes in the network configuration). The VX will not perform DAD and not assign the same blocked IP until changes are made in the network configuration and transmitted.

IPv6 Address - Static

You can also assign the IPv6 address manually in the interface. For detailed information, see Setting Up IP Interfaces.

The following steps outline the VX's process when an IPv6 address is manually configured.

Step 1: How IPv6 Address is Verified for Duplicate Address Detection

  • Duplicate Address Detection (DAD) is performed over the network. If Duplicate Address exists in the network, the VX blocks the configured IPv6 Address and does not apply it to the Interface. An ALARM is then generated in the CLI. If Duplicate Address does not exist in the network, the VX assigns the configured IP address to the interface. For detailed information about setting the DAD configuration, see Ethernet Adapters.

It takes some time to transmit the configuration when the new interface/adapter is added, when the IP Address is changed on the interface, or any DNS is added.

Step 2: Verify IPv6 Address 

  • Once the IP address is transmitted successfully, verify the configured IPv6 address through the “show ip” command in CLI.
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