R3721-F3210-F3171-HP High-End Firewalls Network Management Configuration Guide-6PW101

Table Of Contents
879
Enable IPv6 forwarding and configure an IPv6 unicast routing protocol so that all devices in the
domain can be interoperable at the network layer
Configure basic functions of MLD
Determine the startup query interval
Determine the startup query count
Determine the MLD query interval
Determine the MLD querier's robustness variable
Determine the maximum response delay of MLD general query messages
Determine the MLD last listener query interval
Determine the MLD other querier present interval
Configuring MLD message options
MLD queries include multicast-address-specific queries and multicast-address-and-source-specific queries,
and IPv6 multicast groups change dynamically, so a device cannot maintain the information for all IPv6
multicast sources and groups. Therefore, a router might receive IPv6 multicast packets addressed to IPv6
multicast groups that have no members on the local subnet. In this case, the Router-Alert option carried
in the IPv6 multicast packets is useful for the router to determine whether to deliver the IPv6 multicast
packets to the upper-layer protocol for processing. For more information about the Router-Alert option,
see RFC 2113 .
An MLD message is processed differently depending on whether it carries the Router-Alert option in the
IPv6 header, as follows:
By default, in consideration of compatibility, the device does not check the Router-Alert option. That
is, it processes all received MLD messages. In this case, the device passes MLD messages to the
upper layer protocol for processing, whether the MLD messages carry the Router-Alert option or not.
To enhance the device performance, avoid unnecessary costs, and ensure protocol security, you
can configure the device to discard MLD messages that do not carry the Router-Alert option.
Configuring the Router-Alert option for MLD messages globally
Ste
p
Command Remarks
1. Enter system view. system-view N/A
2. Enter MLD view.
mld N/A
3. Configure the interface to
discard any MLD message
without the Router-Alert
option.
require-router-alert
By default, the device does not
check MLD messages for the
Router-Alert option.
4. Enable the insertion of the
Router-Alert option into MLD
messages.
send-router-alert
By default, MLD messages carry
the Router-Alert option.
Configuring the Router-Alert option on an interface
Ste
p
Command Remarks
1. Enter system view.
system-view N/A