HP VPN Firewall Appliances Network Management Configuration Guide

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• 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 Router-Alert option handling methods
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:
• For compatibility, the device by default ignores the Router-Alert option and processes all received
MLD messages, no matter whether the MLD messages carry the Router-Alert option or not.
• To enhance device performance, avoid unnecessary costs, and ensure protocol security, configure
the device to discard MLD messages that do not carry the Router-Alert option.
Configuring Router-Alert option handling methods 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 Router-Alert option handling methods on an interface
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter interface view.
interface interface-type
interface-number
N/A
3. Configure the interface to discard any
MLD message without the Router-Alert
option.
mld require-router-alert
By default, the device does not
check MLD messages for the
Router-Alert option.