User's Manual

Smart Managed Pro Switches MS510TX and MS510TXPP
Configure Switching User Manual143
The default password is password.
The System Information page displays.
5. Select Switching>
Multicast > IGMP Snooping Querier > Querier VLAN Status.
The Querier VLAN Status page displays.
The following table describes the nonconfigurable information displayed on the page.
Table 40. Querier VLAN Status information
Field Description
VLAN ID The VLAN ID on which IGMP snooping querier is administratively enabled
and the VLAN exists in the VLAN database.
Operational State The operational state of the IGMP snooping querier on a VLAN. It
can be in
any of the following states:
• Enabled.
The snooping switch is the querier in the VLAN. The
snooping switch sends periodic queries with a time interval equal to the
configured querier query interval.
• Disabled.
The snooping querier is not operational on the VLAN. The
snooping querier moves to disabled mode when IGMP snooping is not
operational on the VLAN or when the querier address is not configured
or the network management address is also not configured.
Operational Version The operational IGMP protocol version of the snooping querier.
Operational Max Response Time The maximum response time used in the queries that are sent by the
snooping querier
.
MLD Snooping Overview
Multicast Listener Discovery (MLD) is a protocol that is used by IPv6 multicast routers to
discover the presence of multicast listeners (nodes that want to receive IPv6 multicast
packets) on its directly attached links and to discover which multicast packets are of interest
to neighboring nodes. MLD is derived from IGMP; MLD version 1 (MLDv1) is equivalent to
IGMPv2, and MLD version 2 (MLDv2) is equivalent to IGMPv3.
MLD is a subprotocol of Internet Control Message Protocol version 6 (ICMPv6), and MLD
messages
are a subset of ICMPv6 messages, identified in IPv6 packets by a preceding Next
Header value of 58.
The switch can snoop on both MLDv1 and MLDv2 protocol packets and
bridge IPv6 multicast
data based on destination IPv6 multicast MAC addresses. You can configure the switch to
perform MLD snooping and IGMP snooping simultaneously.
In IPv4, Layer 2 switches can use IGMP snooping to limit the flooding of multicast traf
fic by
dynamically configuring Layer 2 interfaces so that multicast traffic is forwarded to only those
interfaces associated with IP multicast address. In IPv6, MLD snooping performs a similar
function. With MLD snooping, IPv6 multicast data is selectively forwarded to a list of ports
that want to receive the data, instead of being flooded to all ports in a VLAN. The switch
constructs this list by snooping IPv6 multicast control packets.