Reference Guide

450 | IPv6 Routing
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IPv6 Neighbor Discovery of MTU packets
With FTOS 8.3.1.0, you can set the MTU advertised through the RA packets to incoming routers, without
altering the actual MTU setting on the interface. The
ipv6 nd mtu command sets the value advertised to
routers. It does not set the actual MTU rate. For example, if
ipv6 nd mtu is set to 1280, the interface will
still pass 1500-byte packets, if that is what is set with the
mtu command.
QoS for IPv6
IPv6 QoS is supported on platform e
FTOS IPv6 supports quality of service based on DSCP field. You can configure FTOS to honor the DSCP
value on incoming routed traffic and forward the packets with the same value.
IPv6 Multicast
IPv6 Multicast is supported on platforms e
FTOS supports the following protocols to implement IPv6 multicast routing:
• Multicast Listener Discovery Protocol (MLD). MLD on a multicast router sends out periodic general
MLD queries that the switch forwards through all ports in the VLAN. There are two versions of MLD:
MLD version 1 is based on version 2 of the Internet Group Management Protocol (IGMP) for IPv4;
MLD version 2 is based on version 3 of the IGMP for IPv4. IPv6 multicast for FTOS supports versions
1 and 2.
• PIM-SM. Protocol-Independent Multicast-Sparse Mode (PIM-SM) is a multicast protocol in which
multicast receivers explicitly join to receive multicast traffic. The protocol uses a router as the root or
Rendezvous Point (RP) of the share tree distribution tree to distribute multicast traffic to a multicast
group. Messages to join the multicast group (Join messages) are sent towards the RP and data is sent
from senders to the RP so receivers can discover who are the senders and begin receiving traffic
destined to the multicast group.
• PIM in Source Specific Multicast (PIM-SSM). PIM-SSM protocol is based on the source specific
model for forwarding Multicast traffic across multiple domains on the Internet. It is restricted to
shortest path trees (SPTs) to specific sources described by hosts using MLD. PIM-SSM is essentially a
subset of PIM-SM protocol, which has the capability to join SPTs. The only difference being register
states and shared tree states for Multicast groups in SSM range are not maintained. End-hosts use
MLD to register their interest in a particular source-group (S,G) pair. PIM-SSM protocol interacts with
MLD to construct the multicast forwarding tree rooted at the source S.
Refer to the
FTOS Command Line Reference Guide Multicast chapter, in the section IPv6 Multicast
Commands for configuration details.