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Page 186 / 331 Scroll up to view Page 181 - 185
VMG1312-B Series User’s Guide
186
C
HAPTER
13
IGMP/MLD
13.1
Overview
Use the
IGMP/MLD
screen to configure IGMP/MLD group settings.
13.1.1
What You Need To Know
Multicast and IGMP
See
Multicast on page 92
for more information.
Multicast Listener Discovery (MLD)
The Multicast Listener Discovery (MLD) protocol (defined in RFC 2710) is derived from IPv4's
Internet Group Management Protocol version 2 (IGMPv2). MLD uses ICMPv6 message types, rather
than IGMP message types. MLDv1 is equivalent to IGMPv2 and MLDv2 is equivalent to IGMPv3.
•
MLD allows an IPv6 switch or router to discover the presence of MLD hosts who wish to receive
multicast packets and the IP addresses of multicast groups the hosts want to join on its network.
•
MLD snooping and MLD proxy are analogous to IGMP snooping and IGMP proxy in IPv4.
•
MLD filtering controls which multicast groups a port can join.
•
An MLD Report message is equivalent to an IGMP Report message, and a MLD Done message is
equivalent to an IGMP Leave message.
IGMP Fast Leave
When a host leaves a multicast group (224.1.1.1), it sends an IGMP leave message to inform all
routers (224.0.0.2) in the multicast group. When a router receives the leave message, it sends a
specific query message to all multicast group (224.1.1.1) members to check if any other hosts are
still in the group. Then the router deletes the host’s information.
With the IGMP fast leave feature enabled, the router removes the host’s information from the group
member list once it receives a leave message from a host and the fast leave timer expires.
13.2
The IGMP/MLD Screen
Use this screen to configure multicast groups the Device has joined and which ports have joined it.
To open this screen, click
Network Setting > IGMP/MLD
.
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Chapter 13 IGMP/MLD
VMG1312-B Series User’s Guide
187
Figure 95
Network Setting > IGMP/MLD
The following table describes the labels in this screen.
Table 70
Network Setting > IGMP/MLD
LABEL
DESCRIPTION
IGMP/MLD Configuration
Default Version
Enter the version of IGMP (1~3) and MLD (1~2) that you want the Device to use on the
WAN.
Query Interval
Enter the number of seconds the Device sends a query message to hosts to get the group
membership information.
Query
Response
Interval
Enter the maximum number of seconds the Device can wait for receiving a General Query
message. Multicast routers use general queries to learn which multicast groups have
members.
Last Member
Query Interval
Enter the maximum number of seconds the Device can wait for receiving a response to a
Group-Specific Query message. Multicast routers use group-specific queries to learn
whether any member remains in a specific multicast group.
Robustness
Value
Enter the number of times (1~7) the Device can resend a packet if packet loss occurs due to
network congestion.
Page 188 / 331
Chapter 13 IGMP/MLD
VMG1312-B Series User’s Guide
188
Maximum
Multicast
Groups
Enter a number to limit the number of multicast groups an interface on the Device is allowed
to join. Once a multicast member is registered in the specified number of multicast groups,
any new IGMP or MLD join report frames are dropped by the interface.
Maximum
Multicast Data
Sources
Enter a number to limit the number of multicast data sources (1-24) a multicast group is
allowed to have.
Note: The setting only works for IGMPv3 and MLDv2.
Maximum
Multicast Group
Members
Enter a number to limit the number of multicast members a multicast group can have.
Fast Leave
Enable
Select this option to set the Device to remove a port from the multicast tree immediately
(without sending an IGMP or MLD membership query message) once it receives an IGMP or
MLD leave message. This is helpful if a user wants to quickly change a TV channel (multicast
group change) especially for IPTV applications.
LAN to LAN
(Intra LAN)
Multicast
Enable
Select this to enable LAN to LAN IGMP snooping capability.
Membership
Join Immediate
(IPTV)
Select this to have the Device add a host to a multicast group immediately once the Device
receives an IGMP or MLD join message.
Apply
Click
Apply
to save your changes back to the Device.
Cancel
Click
Cancel
to exit this screen without saving.
Table 70
Network Setting > IGMP/MLD (continued)
LABEL
DESCRIPTION
Page 189 / 331
VMG1312-B Series User’s Guide
189
C
HAPTER
14
Vlan Group
14.1
Overview
Virtual LAN IDs are used to identify different traffic types over the same physical link.
In the following example, the Device (DSL) can use VLAN IDs (VID) 100 and 200 to identify Video-
on-Demand and IPTV traffic respectively coming from the two VoD and IPTV multicast servers. The
Device (DSL) can also tag outgoing requests to these servers with these VLAN IDs.
Figure 96
VLAN Group Example
14.1.1
What You Can Do in this Chapter
Use these screens to group separate VLAN groups together to be treated as one VLAN group.
14.2
The Vlan Group Screen
Click
Network Setting > Vlan Group
to open the following screen.
Figure 97
Network Setting > Vlan Group
Page 190 / 331
Chapter 14 Vlan Group
VMG1312-B Series User’s Guide
190
The following table describes the fields in this screen.
14.2.1
Add/Edit a VLAN Group
Click the
Add New VLAN Group
button in the
Vlan Group
screen to open the following screen.
Use this screen to create a new VLAN group.
Figure 98
Add/Edit VLAN Group
The following table describes the fields in this screen.
Table 71
Network Setting > Vlan Group
LABEL
DESCRIPTION
Add New Vlan
Group
Click this button to create a new VLAN group.
#
This is the index number of the VLAN group.
Group Name
This shows the descriptive name of the VLAN group.
VLAN ID
This shows the unique ID number that identifies the VLAN group.
Interfaces
This shows the LAN ports included in the VLAN group and if traffic leaving the port will be
tagged with the VLAN ID.
Modify
Click the
Edit
icon to change an existing VLAN group setting or click the
Delete
icon to
remove the VLAN group.
Table 72
Add/Edit VLAN Group
LABEL
DESCRIPTION
VLAN Group
Name
Enter a name to identify this group. You can enter up to 30 characters. You can use letters,
numbers, hyphens (-) and underscores (_). Spaces are not allowed.
VLAN ID
Enter a unique ID number, from 1 to 4,094, to identify this VLAN group. Outgoing traffic is
tagged with this ID if
Tx tagging
is selected below.
LAN
Select
Include
to add the associated LAN interface to this VLAN group.
Select
Tx tagging
to tag outgoing traffic from the associated LAN port with the
VLAN ID
number entered above.
Apply
Click
Apply
to save your changes back to the Device.
Cancel
Click
Cancel
to exit this screen without saving.

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