Igmp And Routing Protocol Interactions; Igmp And Dvmrp Interaction - Avaya 8800 Planning And Engineering, Network Design

DVMRP does not operate with the same constraint because the existence of one path between a
source and a receiver is enough to obtain the traffic for that receiver. In
with non-PIM interfaces
used to obtain the traffic. DVMRP uses its own routing table, and thus, is not impacted by the
unicast routing table.

IGMP and routing protocol interactions

The following cases provide design tips for those situations where Layer 2 multicast is used with
Layer 3 multicast protocols. The interoperation of Layer 2 and 3 multicast typically occurs when a
Layer 2 edge device connects to one or several Layer 3 devices.
To prevent the switch from dropping some multicast traffic, configure the IGMP Query Interval to a
value higher than five.
IGMP and routing protocol interactions navigation
•

IGMP and DVMRP interaction

• IGMP and PIM-SM interaction
IGMP and DVMRP interaction
This section describes a possible problem that can arise when IGMP Snoop and DVMRP interact. In
the following figure, switches A and B run DVMRP, and switch C runs IGMP Snoop. Switch C
connects to A and B through ports P1 and P2 respectively. Ports P1, P2, P3, and P4 are in the
same VLAN. Source S is attached to switch A on a VLAN different than the one that connects A to
C. A receiver (R) is attached to switch B on another VLAN.
June 2016
on page 212, if DVMRP replaces PIM, the path through A to the receiver is
on page 219
on page 220
Planning and Engineering — Network Design
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IGMP and routing protocol interactions
Figure 101: PIM network
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