Document Text Contents
Page 1
OptiX OSN 8800/6800/3800
V100R006C01
Configuration Guide
Issue 02
Date 2011-10-31
HUAWEI TECHNOLOGIES CO., LTD.
Page 309
multicast services are interrupted for a long time. The IGMP Snooping informs the router
of the change in the response spanning tree topology and then quickly transmits the query
packets. In this way, the switching equipment in the downstream can learn the multicast
information quickly and decrease the service interruption time.
Basic Concepts
1. Enabling the IGMP Snooping Protocol
l If the IGMP Snooping protocol is enabled, the equipment begins to perform the learning
and aging of the router port and multicast group. Then, the multicast services are
multicast in corresponding multicast groups.
l If the IGMP Snooping protocol is disabled, the equipment stops learning and aging of
the router port and multicast group, and deletes all the learned dynamic multicast groups.
2. Router Port
The router port refers to the port that faces the multicast router. The Ethernet data board of
the equipment regards the port that receives the IGMP query packets as the router port.
Router ports are classified into two types:
l Dynamic router ports: They receive the IGMP query packets. These ports are decided
on the basis of the packets transmitted between routers and hosts. Moreover, they are
dynamically maintained. Each of this port can enable a router port aging timer. When
the timer times out, this router port is invalid and the multicast group that relies on the
router port is deleted.
l Static router ports: They are specified with configuration commands, and are not aged.
NOTE
Both the L4G and TBE boards do not support the static router ports.
3. Member Port
The multicast member port refers to the port that faces the host of the member. The Layer
2 equipment forwards the multicast service packets to these ports. The multicast group
member ports, referred to as member ports for short, are classified into the following two
types:
l Dynamic member ports, which can receive the IGMP report packets. These ports are
decided on the basis of the packets transmitted between routers and hosts. Moreover,
they are dynamically maintained. Each dynamic member port is aged after reaching the
maximum non-response times.
l Static member ports, which are specified by users by using configuration commands,
cannot be aged.
Basic Principle
As a multicast constraint mechanism of the Layer 2 Ethernet switch, the IGMP Snooping runs
at the data link layer, to manage and control multicast groups.
When the Layer 2 Ethernet switch receives an IGMP packet between the host and router, the
IGMP Snooping analyzes the information carried by the packet.
l When monitoring an IGMP response packet sent by the host, the switch adds the host into
the corresponding multicast table.
l When monitoring an IGMP departure packet sent by the host, the switch deletes the
multicast table item corresponding to the host.
OptiX OSN 8800/6800/3800
Configuration Guide 10 Configuring Ethernet Services
Issue 02 (2011-10-31) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
287
OptiX OSN 8800/6800/3800
V100R006C01
Configuration Guide
Issue 02
Date 2011-10-31
HUAWEI TECHNOLOGIES CO., LTD.
Page 309
multicast services are interrupted for a long time. The IGMP Snooping informs the router
of the change in the response spanning tree topology and then quickly transmits the query
packets. In this way, the switching equipment in the downstream can learn the multicast
information quickly and decrease the service interruption time.
Basic Concepts
1. Enabling the IGMP Snooping Protocol
l If the IGMP Snooping protocol is enabled, the equipment begins to perform the learning
and aging of the router port and multicast group. Then, the multicast services are
multicast in corresponding multicast groups.
l If the IGMP Snooping protocol is disabled, the equipment stops learning and aging of
the router port and multicast group, and deletes all the learned dynamic multicast groups.
2. Router Port
The router port refers to the port that faces the multicast router. The Ethernet data board of
the equipment regards the port that receives the IGMP query packets as the router port.
Router ports are classified into two types:
l Dynamic router ports: They receive the IGMP query packets. These ports are decided
on the basis of the packets transmitted between routers and hosts. Moreover, they are
dynamically maintained. Each of this port can enable a router port aging timer. When
the timer times out, this router port is invalid and the multicast group that relies on the
router port is deleted.
l Static router ports: They are specified with configuration commands, and are not aged.
NOTE
Both the L4G and TBE boards do not support the static router ports.
3. Member Port
The multicast member port refers to the port that faces the host of the member. The Layer
2 equipment forwards the multicast service packets to these ports. The multicast group
member ports, referred to as member ports for short, are classified into the following two
types:
l Dynamic member ports, which can receive the IGMP report packets. These ports are
decided on the basis of the packets transmitted between routers and hosts. Moreover,
they are dynamically maintained. Each dynamic member port is aged after reaching the
maximum non-response times.
l Static member ports, which are specified by users by using configuration commands,
cannot be aged.
Basic Principle
As a multicast constraint mechanism of the Layer 2 Ethernet switch, the IGMP Snooping runs
at the data link layer, to manage and control multicast groups.
When the Layer 2 Ethernet switch receives an IGMP packet between the host and router, the
IGMP Snooping analyzes the information carried by the packet.
l When monitoring an IGMP response packet sent by the host, the switch adds the host into
the corresponding multicast table.
l When monitoring an IGMP departure packet sent by the host, the switch deletes the
multicast table item corresponding to the host.
OptiX OSN 8800/6800/3800
Configuration Guide 10 Configuring Ethernet Services
Issue 02 (2011-10-31) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
287
