HP FlexNetwork MSR 954 User Manual

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Figure 11 IGMP snooping ports
Router ports
On an IGMP snooping Layer 2 device, the ports toward Layer 3 multicast devices are called router
ports. In Figure 11, GigabitEthernet 1/0/1 of Switch A and GigabitEthernet 1/0/1 of Switch B are
router ports.
Router ports contain the following types:
•
Dynamic router port—When a port receives an IGMP general query whose source address is
not 0.0.0.0 or receives a PIM hello message, the port is added into the dynamic router port list.
At the same time, an aging timer is started for the port. If the port receives either of the
messages before the timer expires, the timer is reset. If the port does not receive either of the
messages when the timer expires, the port is removed from the dynamic router port list.
•
Static router port—When a port is statically configured as a router port, it is added into the
static router port list. The static router port does not age out, and it can be deleted only
manually.
Do not confuse the "router port" in IGMP snooping with the "routed interface" commonly known as
the "Layer 3 interface." The router port in IGMP snooping is a Layer 2 interface.
Member ports
On an IGMP snooping Layer 2 device, the ports toward receiver hosts are called member ports. In
Figure 11, GigabitEthernet 1/0/2 and GigabitEthernet 1/0/3 of Switch A and GigabitEthernet 1/0/2 of
Switch B are member ports.
Member ports contain the following types:
•
Dynamic member port—When a port receives an IGMP report, it is added to the associated
dynamic IGMP snooping forwarding entry as an outgoing interface. At the same time, an aging
timer is started for the port. If the port receives an IGMP report before the timer expires, the
timer is reset. If the port does not receive an IGMP report when the timer expires, the port is
removed from the associated dynamic forwarding entry.
•
Static member port—When a port is statically configured as a member port, it is added to the
associated static IGMP snooping forwarding entry as an outgoing interface. The static member
port does not age out, and it can be deleted only manually.
Unless otherwise specified, router ports and member ports in this document include both static and
dynamic router ports and member ports.
Router A Switch A
Switch B
GE1/0/1 GE1/0/2
GE1/0/3
GE1/0/1
GE1/0/2
Receiver
Receiver
Host A
Host B
Host C
Host D
Source
Multicast packets
Router port
Member port

HP FlexNetwork MSR 954 Specifications

General

Brand	HP
Model	FlexNetwork MSR 954
Category	Network Router
Language	English