Siemens S323, S223 user manual Multicast Vlan Registration MVR, Immediate Block

UMN:CLI	User Manual
	SURPASS hiD 6615 S223/S323 R1.5

To display a configuration, use the following command.

Command	Mode	Description
show ip igmp snooping explicit-	Enable
tracking {vlan VLANS port	Global	Shows a configuration.
PORTS group A.B.C.D}	Bridge

9.2.6.3Immediate Block

For a Layer 2 IGMP v2 host interface to join an IP multicast group, a host sends an IGMP membership report for the IP multicast group. For a host to leave a multicast group, it can either ignore the periodic IGMP general queries or it can send an IGMP leave message. When the switch receives an IGMP leave message from a host, it sends out an IGMP group-specific query to determine whether any devices connected to that interface are in- terested in traffic for the specific multicast group. The switch then updates the table entry for that Layer 2 multicast group so that only those hosts interested in receiving multicast traffic for the group are listed.

However, IGMP v3 hosts send IGMP v3 membership reports (with the allow group record mode) to join a specific multicast group. When IGMP v3 hosts send membership reports (with the block group record) to reject traffic from all sources in the previous source list, the last host on the port will be removed by immediate-leave.

To configure the Immediate Block, use the following command.

	Command			Mode	Description
ip igmp	snooping	immediate-			Enables immediate block on the system.
block
				Global
ip igmp	snooping	vlan	VLANS		Enables immediate block on a VLAN interface.
immediate-block

9.2.7Multicast VLAN Registration (MVR)

Multicast VLAN Registration (MVR) is for applications using wide-scale deployment of multicast traffic across an Ethernet ring-based service provider network. MVR allows a subscriber on a port to subscribe or not to a multicast stream on the network-wide multi- cast VLAN. It allows the single multicast VLAN to be shared in the network with subscrib- ers remaining in separate VLANs. MVR helps to continuously send multicast streams in the multicast VLAN, but to isolate the streams from the subscriber VLANs for bandwidth and security reasons.

MVR assumes that subscribers subscribe or not (join and leave) these multicast streams by sending out IGMP join and leave messages. These messages can originate from an IGMP version-2-compatible host. Although MVR operates on the underlying mechanism of IGMP snooping, the two features operate independently of each other. One can be en- abled or disabled without affecting the behavior of the other feature. However, if IGMP snooping and MVR are both enabled, MVR reacts only to join and leave messages from multicast groups configured under MVR. Join and leave messages from all other multi- cast groups are managed by IGMP snooping.

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