UMN:CLI User Manual
V5808
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ip igmp snooping vlan VLANS
mrouter learn pim
Enables to learn multicast router ports through PIM
hello packets on a VLAN.
VLANS: VLAN ID (1-4094)
To disable the switch to learn multicast router ports through PIM hello packets, use the
following command.
no ip igmp snooping mrouter
learn pim
Disables to learn multicast router ports through PIM
hello packets.
no ip igmp snooping vlan
VLANS mrouter learn pim
Multicast Router Port Forwarding
The multicast traffic should be forwarded to IGMP snooping membership ports and
multicast router ports because the multicast router needs to receive muticast source
information. To enable the switch to forward the traffic to multicast router ports, use the
following command.
ip multicast mrouter-pass-
through
Enables to forward multicast traffic to the multicast
router ports.
no ip multicast mrouter-pass-
through
Disables to forward multicast traffic to the multicast
router ports.
Displaying Multicast Router Port
To display a current multicast router port for IGMP snooping, use the following command.
show ip igmp snooping mrouter
Shows a current multicast router port for IGMP
snooping globally.
show ip igmp snooping vlan
VLANS mrouter
Shows a current multicast router port for IGMP
snooping on a specified VLAN.
VLANS: VLAN ID (1-4094)
9.2.3.8 TCN Multicast Flooding
When a network topology change occurs, the protocols for a link layer topology – such as
spanning tree protocol (STP), etc – notify switches in the topology using a topology
change notification (TCN).
When TCN is received, the switch where an IGMP snooping is running will flood multicast
traffic to all ports in a VLAN, since a network topology change in a VLAN may invalidate
previously learned IGMP snooping information. However, this flooding behavior is not
desirable if the switch has many ports that are subscribed to different groups. The traffic
could exceed the capacity of the link between the switch and the end host, resulting in
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