H3C S7500E Series Ethernet Switches Operation Manual

Operation Manual – IPv6 Routing
H3C S7500E Series Ethernet Switches Chapter 4 IPv6 IS-IS Configuration
4-1
Chapter 4 IPv6 IS-IS Configuration
 Note:
z IPv6 IS-IS supports all the features of IPv4 IS-IS except that it advertises IPv6
routing information instead. This document describes only IPv6 IS-IS exclusive
configuration tasks. For other configuration tasks, refer to the part discussing IPv4
routing.
z The term “router” in this document refers to a Layer 3 switch running routing
protocols.
z At present, the LSQ1GP12EA boards in the S7500E series do not support IPv6.
When configuring IPv6 IS-IS, go to these sections for information you are interested in:
z Introduction to IPv6 IS-IS
z Configuring IPv6 IS-IS Basic Functions
z Configuring IPv6 IS-IS Routing Information Control
z Displaying and Maintaining IPv6 IS-IS
z IPv6 IS-IS Configuration Example
4.1 Introduction to IPv6 IS-IS
The IS-IS routing protocol (Intermediate System-to-Intermediate System intra-domain
routing information exchange protocol) supports multiple network protocols, including
IPv6. IS-IS with IPv6 support is called IPv6 IS-IS dynamic routing protocol. The
international engineer task force (IETF) defines two type-length-values (TLVs) and a
new network layer protocol identifier (NLPID) to enable IPv6 support for IS-IS.
TLV is a variable field in the link state PDU or link state packet (LSP). The two TLVs are:
z IPv6 Reachability: Defines the prefix, metric of routing information to indicate the
network reachability, with a type value of 236 (0xEC).
z IPv6 Interface Address: Similar with the “IP Interface Address” TLV of IPv4, it
transforms the 32-bit IPv4 address to the 128-bit IPv6 address.
NLPID is an 8-bit field with a value of 142 (0x8E), which indicates the network layer
protocol packet. If the IS-IS router supports IPv6, the advertised routing information
must be marked with the NLPID.