Cisco Systems 3560-X, 3750-X Unsupported IPv6 Unicast Routing Features

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Catalyst 3750-X and 3560-X Switch Software Configuration Guide

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Chapter 43 Configuring IPv6 Unicast Routing

Understanding IPv6

SNMP and syslog over IPv6 provide these features:

• Support for both IPv4 and IPv6

• IPv6 transport for SNMP and to modify the SNMP agent to support traps for an IPv6 host

• SNMP- and syslog-related MIBs to support IPv6 addressing

• Configuration of IPv6 hosts as trap receivers

For support over IPv6, SNMP modifies the existing IP transport mapping to simultaneously support IPv4

and IPv6. These SNMP actions support IPv6 transport management:

• Opens User Datagram Protocol (UDP) SNMP socket with default settings

• Provides a new transport mechanism called SR_IPV6_TRANSPORT

• Sends SNMP notifications over IPv6 transport

• Supports SNMP-named access lists for IPv6 transport

• Supports SNMP proxy forwarding using IPv6 transport

• Verifies SNMP Manager feature works with IPv6 transport

For information on SNMP over IPv6, including configuration procedures, see the “Managing Cisco IOS

Applications over IPv6” chapter in the Cisco IOS IPv6 Configuration Library on Cisco.com.

For information about syslog over IPv6, including configuration procedures, see the “Implementing IPv6

Addressing and Basic Connectivity” chapter in the Cisco IOS IPv6 Configuration Library on Cisco.com.

The HTTP client sends requests to both IPv4 and IPv6 HTTP servers, which respond to requests from

both IPv4 and IPv6 HTTP clients. URLs with literal IPv6 addresses must be specified in hexadecimal

using 16-bit values between colons.

The accept socket call chooses an IPv4 or IPv6 address family. The accept socket is either an IPv4 or

IPv6 socket. The listening socket continues to listen for both IPv4 and IPv6 signals that indicate a

connection. The IPv6 listening socket is bound to an IPv6 wildcard address.

The underlying TCP/IP stack supports a dual-stack environment. HTTP relies on the TCP/IP stack and

the sockets for processing network-layer interactions.

Basic network connectivity (ping) must exist between the client and the server hosts before HTTP

connections can be made.

For more information, see the “Managing Cisco IOS Applications over IPv6” chapter in the Cisco IOS

IPv6 Configuration Library on Cisco.com.

Unsupported IPv6 Unicast Routing Features

The switch does not support these IPv6 features:

• IPv6 policy-based routing

• IPv6 virtual private network (VPN) routing and forwarding (VRF) table support

• Support for IPv6 routing protocols: multiprotocol Border Gateway Protocol (BGP) and Intermediate

System-to-Intermediate System (IS-IS) routing

• IPv6 packets destined to site-local addresses

• Tunneling protocols, such as IPv4-to-IPv6 or IPv6-to-IPv4