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CX11x, CX31x, CX710 (Earlier Than V6.03), and CX91x Series Switch Modules V100R001C10 Configuration Guide 13

The documents describe the configuration of various services supported by the CX11x&CX31x&CX91x series switch modules The description covers configuration examples and function configurations.

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This section describes only the differences between IS-IS for IPv6 and IS-IS. For details about the IS-IS implementation principles, see Principles.


IS-IS is a link-state dynamic routing protocol initially designed by the OSI. To support IPv4 routing, IS-IS is applied to IPv4 networks and called as Integrated IS-IS.

As IPv6 networks are built, IS-IS also needs to provide accurate routing information for IPv6 packet forwarding. IS-IS has good scalability, supports IPv6 network layer protocols, and is capable of discovering, generating, and forwarding IPv6 routes.

Extended IS-IS for IPv6 is defined in the draft-ietf-isis-ipv6-05 of the IETF. To process and calculate IPv6 routes, IS-IS uses two new TLVs and one network layer protocol identifier (NLPID).

The two TLVs are as follows:

  • TLV 236 (IPv6 Reachability): describes network reachability by defining the route prefix and metric.

  • TLV 232 (IPv6 Interface Address): is similar to the IP Interface Address TLV of IPv4, except that it changes a 32-bit IPv4 address to a 128-bit IPv6 address.

The NLPID is an 8-bit field that identifies the protocol packets of the network layer. The NLPID of IPv6 is 142 (0x8E). If IS-IS supports IPv6, it advertises routing information through the NLPID value.

Updated: 2019-12-13

Document ID: EDOC1000041694

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