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Sun Ethernet Fabric Operating System

IPv6 Administration Guide

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Document Information

Using This Documentation

Product Notes

Related Documentation

Acronyms and Abbreviations

CLI Command Modes


Support and Accessibility

Protocol Description



Basic SEFOS IPv6 Topology

Route Redistribution Topology in IPv6

General Configurations

Default Settings

Completing Preliminary Configurations

Create an Interface

Configure an IPv4 Address for an Interface

Configuring the Basic IPv6 Topology

Configure Switch 1

Configure Switch 2

Configuring the Route Redistribution Topology

Configure Switch 1

Configure Switch 2

Configure Switch 3

IPv6 Feature Configuration

Configuring IPv6 Support in an Interface

Enable IPv6 Support

Disable IPv6 Support

Configuring IPv6 Addressing

Add IPv6 Addresses to an Interface

Remove IPv6 Addresses From an Interface

Configuring IPv6 Routing

Enable IPv6 Routing

Disable IPv6 Routing

Configuring IPv6 Static Routes

Add a Static Route

Remove a Static Route

Configuring Static Neighbor Cache Entries

Add a Neighbor Cache Entry

Delete a Neighbor Cache Entry

Checking a Local or Remote Endpoint

Check an Endpoint Using Default Values

Check an Endpoint Using the Link-Local Address

Configuring Router Advertisement Parameters

Configure Router Advertisement Parameters

Configuring DAD Entries

Set the DAD Attempts

Reset the DAD Attempts

Configuring PMTU Discovery

Enable PMTU Discovery

Disable PMTU Discovery

Setting the MTU for Use in PMTU Discovery

Set the MTU for Use in PMTU Discovery

Configuring the IPv6 Route Redistribution Policy for Routing Protocols

Configure the IPv6 Route Redistribution Policy for Routing Protocols

Configuring PMTU Discovery

The PMTU discovery feature enables the source node to dynamically discover the PMTU for a topology, which ensures optimal usage of network resources. PMTU discovery dynamically discovers the MTU of a path so that the packet can be sent with a size that is equal to the PMTU of the path, not a size that is equal to the IPv6 minimum link MTU. The source node assumes that the PMTU of a path is the MTU of the first hop in that path, so the node sends the packet with the assumed size. If any node along the path is not able to forward the packets due to a large size, that node discards the packet and returns ICMPv6 Packet-Too-Big messages. The source node reduces the assumed PMTU based on the MTU of the constricting node, and resends the packets. This process is iterated until an acceptable PMTU value is derived.

These procedures show how to configure PMTU discovery: