Reference Guide

Multicast Listener Discovery | 595
Enable Snooping Explicit Tracking
The switch can be a querier, and therefore also has the option of updating the group table through
explicit-tracking (refer to Explicit Tracking). Whether the switch is the Querier or not, if snooping is
enabled, the switch tracks all MLD joins. It has separate explicit tracking table which contains group,
source, interface, VLAN and reporter details.
Display the MLD Snooping Table
MLDv2 Snooping
With MLDv1 Snooping, multicast forwarding tables are formed for a group, G, based on received MLDv1
reports. With MLDv2 Snooping, multicast forwarding tables are formed for a source and group pair, (S,G),
based on received MLDv2 include reports. MLDv2 Snooping is compatible with MLDv1 hosts and selects
a port as dynamic mrouter port when it receives Membership Query on that port.
Port Inheritance on Mixed MLD Mode VLANs
A mixed MLD mode VLAN is one which has multiple hosts belonging to the same group, but some hosts
exclude a source (S,G), and others include the same source (S,G).
Figure 30-4. Port Inheritance on Mixed-mode VLANs
Task Command Syntax Command Mode
Configure the system to remove a group
immediately after receiving a Leave message.
ipv6 mld snooping explicit-tracking VLAN INTERFACE
Display the MLD explicit-tracking table.
show ipv6 mld snooping groups explicit
EXEC Privilege
Task Command Syntax Command Mode
Display the MLD Snooping table. show ipv6 mroute mld EXEC Privilege
Display group information in the table. Group information can be
filtered, refer to the FTOS Command Line Reference for the options
available with this command.
show ipv6 mld
snooping groups
EXEC Privilege
VLAN 10
1
2
3
4
include (S,G)
exclude (*,G)
(*,G)
1
(S,G)
1*, 3
Snooping Table
MLDv2
IGMP
(*,G)
1, 3