Siemens S223, S323 user manual Multicast TCN Flooding, Mrouter Port Learning Method

User Manual				UMN:CLI
SURPASS hiD 6615 S223/S323 R1.5
	To disable the port where multicast router is connected, use the following command.
	Command		Mode	Description
	no ip igmp snooping mrouter			Disables the port where multicast router is connected
	port {PORTS cpu}			on the system
			Global
	no ip igmp	snooping vlan		Disables the port where multicast router is connected
	VLANS mrouter	port {PORTS
				on a VLAN interface.
	cpu}

Mrouter Port Learning Method

For the hiD 6615 S323, multicast-capable router ports are added to the forwarding table for every Layer 2 multicast entry. The switch learns such ports through snooping on PIM packets. The switch snoops on PIM packets on all VLANs.

To configure Mrouter port learning method, use the following commands.

Command	Mode	Description
ip igmp snooping mrouter learn		Configures the mrouter port learning method on the
pim		system.
ip igmp snooping vlan VLANS		Configures the mrouter port learning method on a
mrouter learn pim	Global	VLAN interface.
no ip igmp snooping mrouter		Disables the mrouter port learning method on the sys-
learn pim		tem.
no ip igmp snooping vlan		Disables the mrouter port learning method on a VLAN
VLANS mrouter learn pim		interface.

Displaying Mrouter Configuration

To display IGMP snooping mrouter configuration, use the following command.

Command	Mode	Description
show ip igmp snooping mrouter	Enable	Shows the mrouter configuration on the system.
	Global
show ip igmp snooping vlan		Shows the mrouter configuration and detail information
VLANS mrouter	Bridge	on a VLAN interface.

9.2.5.6Multicast TCN Flooding

An IGMP snooping-disabled switch does not flood multicast traffic to all ports in a VLAN when a spanning-tree Topology Change Notification (TCN) is received. A topology can change in a VLAN and it may invalidate previously learned IGMP snooping information. A host that was on one port before the topology change may move to another port after the topology change. The hiD 6615 S223/S323 switch helps to deliver multicast traffic is de- livered to all multicast receivers in that VLAN when the topology changes. When the spanning tree protocol is running in a VLAN, a spanning tree topology change notification (TCN) is issued by the root switch in the VLAN.

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