How MPLS technology supports mobile IPv6

The mobile node first completes the proxy search and registration operations during the Mobile IPv6 processing process. After binding and updating the mobile node, it should establish a direct connection and forwarding path from the entry LER to the exit LER, this is similar to the Routing Optimization Implementation of mobile IPv4.

The mobile node first completes the proxy search and registration operations during the Mobile IPv6 processing process. After binding and updating the mobile node, it should establish a direct connection and forwarding path from the entry LER to the exit LER, this is similar to the Routing Optimization Implementation of mobile IPv4. The difference with mobile IPv4 is that binding update is the basic implementation part of IPv6, and routing optimization is an optional part of IPv4 expansion. In mobile IPv6, registry and routing optimization are implemented by a separate protocol entity. Secondly, there is no LER/FA in IPv6, because mobile IPv6 nodes only use the configured transfer address. In addition, to avoid triangular routing problems, mobile nodes send binding updates and QoS objects to associated nodes. The LER that receives the bound update information should determine whether to initiate the request/path information. The new QoS-guaranteed LSP provides a tunnel for data packets. The associated node that receives the bound update information can send data packets directly to the mobile node.

When a mobile node initiates data transmission, it sends data packets directly to the associated node. When an associated node sends data packets to a mobile node, the processing process is the same as that of Data Transmission initiated by the associated node.

When the associated node initiates data transmission, it should find the record table of the destination address of the data packet in the bound high-speed cache to move the ownership of the node. If the associated node has this address record, it should use the Routing header to forward the address packet to the mobile node bound to the record in the cache; if the associated node does not have this address record, the associated node sends a packet to the mobile node owner address, which is intercepted by the owner proxy and encapsulated through a IPv6-in-IPv6) tunnel to the current transfer address of the mobile node. When a mobile node receives a packet encapsulated by a IPv6-in-IPv6, it sends a binding update message. If the entry LER receives the Binding Update message from the mobile node, it initiates the LSP operation between the entry LER and the exit LER.

The IP-in-IP tunneling technology of the original Mobile IP protocol has a high header overhead and heavy load on the network. To find two route tables, Fast Forwarding is not possible, the LSP tunnel uses the "thin cushion" label header to encapsulate a small load on the network, and provides faster convergence. In MPLS networks, once the packets are labeled based on the destination address and QoS information, the LSP tunnel with QoS Assurance is established through the tag distribution protocol such as CR-LDP and RSVP-TE, in the future, the router will no longer analyze the header. All Forwarding is driven by the mark, which reduces the latency of data forwarding. To avoid triangular routing, MPLS nodes can be directly bound by assigning tags between any associated node and any mobile node. This is equivalent to Routing Optimization at the IP layer. Through the above comparison, it can be seen that the Mobile IP service carried on the MPLS network can meet the requirements of real-time and multimedia mobile services for different service levels in the future, the combination of Mobile IP and MPLS technology will become an important solution for constructing Mobile IP networks.