Routing Protocol in IPv6 (1)

In the network protocol, the routing protocol is very important. Now, for the two existing online versions, let's analyze the differences between the routing protocols in IPv4 and IPv6 and the characteristics of new technologies. First, let's take a look at the meaning of the network routing protocol. Here we will explain the differences between the two versions.

Routing Protocol

The IP network routing protocol mainly includes the intra-Domain Routing Protocol and Inter-Domain Routing Protocol ｡

1 Domain Routing Protocol

At present, the IP network routing protocol mainly uses IS-IS and OSPF. The version of OSPF used to exchange IPv4 routing information IS-IS used to exchange IPv6 routing information IS called OSPFv3; IS-IS used to exchange IPv4 protocol version IS-IS, used to exchange IPv6 protocol version IS called IS-ISv6 ｡

(1) differences between OSPFv3 and OSPFv2

OSPFv3 (RFC2740) and OSPFv2 (RFC2328) have no fundamental difference in principle. OSPFv3 still uses the link status LSA database, and maintain the synchronization between neighboring routers. However, due to the change in the address length from IPv4 to IPv6, in order to support the IPv6 address format, OSPFv3 has made many modifications to the OSPFv2 protocol. From the perspective of the routing protocol standardization process, the OSPFv3 protocol is mature and has already finalized the RFC2740 protocol, the network can adapt to the changing requirements, which simplifies the complex network and takes some enhancement measures to ensure easy upgrade, OSPFv3 has been optimized and its security has been improved ｡

The main purpose of OSPFv3 is to "develop a routing protocol independent of any specific network layer". For this purpose, C) the internal router information of st'fv3 has been re-designed. Unlike the previous versions, () SF FV3 does not announce the status of data packets and links (LSA) IP-based data is inserted into the header at the starting position. C) st'fv3 uses network protocol-independent information to execute key tasks that used to require IP header data, for example, identify the LSA that publishes route data ｡

In addition to modifying header data, OSPFv3 also redefined the role of LSA. In OSPFv3, the announcement network topology and IPv6 data task are assigned to the new and existing LSA ｡

OSPFv3 provides multiple optional functions, such as multicast OSPFv3, to achieve versatility, OSPFv3 extends the data domains used by network devices to announce the enable function options. Most OSPFv3 router information contains the option domains. devices running OSPFv3 can support up to 24 optional functions, the previous versions only support eight features ｡

To simplify the construction of Complex Fault-Tolerant networks, OSPFv3 introduces the InstanceID and R-bit options as a component of each OSPFv3 header, the InstanceID no longer depends on the complex authentication scheme or access list required in the past, so that you can control the communication between the vrouters in the shared physical network and the OSPF domain. Besides the InstanceID, OSPFv3 can also use R-bit to make final systems such as servers have effective redundancy ｡

The difference between OSPFv3 and the previous protocol is that it simplifies the message structure by providing non-inherent security. By using the IPv6 protocol package's security sub-header integration system, OSPFv3 messages can be authenticated and encrypted, which previously required independent and complex protocols ｡

OSPFv3 provides more powerful functions and has a great deal of versatility, so it can easily support new network protocols. New features simplify network equipment and operations, when OSPFv3 is used, the upgrade will not be so troublesome ｡

(2) The difference between IS-ISv6 and IS-ISv4

Another connection status Protocol widely used by carriers IS isforipv6. We know that isis is a standard routing protocol (ISO/IEC10589 ), it was originally used to support dynamic protocols of CLNS networks. Because the design of ISIS is very conducive to the expansion of new functions, it first expands the IPv4 routing protocol (RFC1195), and some people think this can serve both CLNS, the protocol that can also serve the IP address is called IntegratedISIS ｡