Operation Manual - Multicast
Quidway S3500 Series Ethernet Switches
Chapter 3 IGMP Snooping Configuration
Huawei Technologies Proprietary
3-4
general query message arrives at a router port, the Ethernet switch will reset the
aging timer of the port. When a port other than a router port receives the IGMP
general query message, the Ethernet switch will notify the multicast router that a
port is ready to join a multicast group and starts the aging timer for the port.
2) IGMP specific query message: Transmitted from the multicast router to the
multicast members and used for querying if a specific group contains any member.
When received IGMP specific query message, the switch only transmits the
specific query message to the IP multicast group which is queried.
3)
IGMP report message: Transmitted from the host to the multicast router and used
for applying to a multicast group or responding to the IGMP query message. When
received the IGMP report message, the switch checks if the MAC multicast group,
corresponding to the IP multicast group the packet is ready to join exists. If the
corresponding MAC multicast group does not exist, the switch only notifies the
router that a member is ready to join a multicast group, creates a new MAC
multicast group, adds the port received the message to the group, starts the port
aging timer, and then adds all the router ports in the native VLAN of the port into
the MAC multicast forwarding table, and meanwhile creates an IP multicast group
and adds the port received the report message to it. If the corresponding MAC
multicast group exists but does not contains the port received the report message,
the switch adds the port into the multicast group and starts the port aging timer.
And then the switch checks if the corresponding IP multicast group exists. If it does
not exist, the switch creates a new IP multicast group and adds the port received
the report message to it. If it exists, the switch adds the port to it. If the MAC
multicast group corresponding to the message exists and contains the port
received the message, the switch will only reset the aging timer of the port.
4) IGMP leave message: Transmitted from the multicast group member to the
multicast router to notify that a router host left the multicast group. When received
a leave message of an IP multicast group, the Ethernet switch transmits the
specific query message concerning that group to the port received the message,
in order to check if the host still has some other member of this group and
meanwhile starts a maximum response timer. If the switch has not receive any
report message from the multicast group, the port will be removed from the
corresponding MAC multicast group. If the MAC multicast group does not have
any member, the switch will notify the multicast router to remove it from the
multicast tree.
3.2 Configure IGMP Snooping
The main IGMP Snooping configuration includes:
z
Enable/disable IGMP Snooping
z
Configure the aging time of router port
z
Configure maximum response time
z
Configure the aging time of multicast group member port
