Method of IPv6 at data center network with VM mobility using graceful address migration

摘要

Systems and methods are provided to detect when a virtual machine moves across a switch device boundary, keep existing application sessions alive, and provide optimal forwarding for new application sessions with graceful address migration. Virtual machine movement can be detected on the new switching device by comparing the Device ID in the Source Address of the ND-NA with the Device ID of the new switching device. A temporary hardware forwarding sub-optimal path is maintained for existing application sessions. A new IP address is assigned to the moved virtual machine and an optimal forwarding path is programmed in hardware for new application sessions. The temporary sub-optimal hardware forwarding path is removed after all old application are terminated.

主权项

1. A method comprising:
receiving a first IPv6 packet at a virtual machine associated with a first switching device; moving the virtual machine such that the virtual machine is associated with a second switching device; detecting the virtual machine movement; updating L2 and L3 hardware table entries on the first switching machine with address information associated with the moved virtual machine; assigning a new IP address to the virtual machine after relocation; updating an AAAA record with address information for the second switching device at a first DNS server; sending the updated AAAA record to all DNS servers other than the first DNS server in a datacenter network; wherein the updated AAAA record indicates the new location of the virtual machine; receiving a second IPv6 packet at the first switching device destined for the virtual machine; obtaining updated virtual machine address information from the L2 and L3 hardware table entries; establishing a temporary IPv6 packet hardware forwarding path from the first switching device to the second switching device in response to detecting the virtual machine movement; and redirecting the second packet to the second switching device on the forwarding path.