HP 6200YL - Manual (Page 39)

Introduction to IPv6
Configuration and Management
IP Preserve
IP Preserve operation preserves both the IPv4 and IPv6 addresses configured
on VLAN 1 (the default VLAN) when a configuration file is downloaded to the
switch using TFTP. Refer to “IP Preserve for IPv6” on page 5-28.
Multicast Listener Discovery (MLD)
MLD operates in a manner similar to IGMP in IPv4 networks. In the factory
default state (MLD disabled), the switch floods all IPv6 multicast traffic it
receives on a given VLAN through all ports on that VLAN except the port
receiving the inbound multicast traffic. Enabling MLD imposes management
controls on IPv6 multicast traffic to reduce unnecessary bandwidth usage.
MLD is configured per- VLAN. For information on MLD, refer to the chapter
titled “Multicast Listener Discovery (MLD) Snooping”.
Web Browser Interface
For the web browser interface, software releases K.13.01 and greater add the
following IPv6 functionality:
■ configure and display IPv6 addressing
■ ping6 diagnostic operation
Path MTU (PMTU) Discovery
IPv6 PMTU operation is managed automatically by the IPv6 nodes between
the source and destination of a transmission. For Ethernet frames, the default
MTU is 1500 bytes. If a router on the path cannot forward the default MTU
size, it sends an ICMPv6 message (PKT_TOO_BIG) with the recommended
MTU to the sender of the frame. If the sender of the frame is an IPv6 node that
supports PMTU discovery, it will then use the MTU specified by the router and
cache it for future reference.
For related information, refer to:
■ RFC 1981: “Path MTU Discovery for IP version 6”
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