Tp-Link T3700G-28TQ V1 [248/415] Pim dm
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Tp-Link T3700G-28TQ V1 [248/415] Pim dm

Tp-Link T3700G-28TQ V1 [248/415] Pim dm
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Configure Switch A
Steps Operation Note
1
Enable IP multicast
routing.
On page Multicast Routing→ Global Config→ Global Config,
enable the multicast routing function.
2
Enable IGMP on
user-side interface.
On page Multicast Routing→ IGMP→ Interface Config
, enable
IGMP (version 3) on interface VLAN 10.
Configure Switch B
Steps Operation Note
1
Enable IP multicast
routing.
On page Multicast Routing→ Global Config→ Global Config,
enable the multicast routing function.
2
Enable IGMP on
user-side interface.
On page Multicast Routing→ IGMP→ Interface Config
, enable
IGMP (version 2) on interface VLAN 20.
Configure Switch C
Steps Operation Note
1
Enable IP multicast
routing.
On page Multicast Routing→ Global Config→ Global Config,
enable the multicast routing function.
2
Enable IGMP on
user-side interface.
On page Multicast Routing→ IGMP→ Interface Config
, enable
IGMP (version 2) on interface VLAN 20.
11.3 PIM DM
In this section we firstly outline PIM protocol, RPF Check mechanism and the two modes of PIM,
then introduce the working process of PIM DM.
PIM is a popular multicast routing protocol within the AS. Instead of relying on one specific unicast
routing protocol, PIM uses the static routing or unicast routing table generated by any unicast
routing protocol (including RIP, OSPF, IS-IS, BGP etc.) to perform routing for IP multicast data.
Unlike some other multicast routing protocols, PIM doesn’t update routing information between
routers or maintain an independent route forwarding table. PIM uses the RPF (Reverse Path
Forwarding) check mechanism to forward the multicast data.
There are two types of multicast routing and forwarding tables in the multicast implementation:
All the multicast route information will be summarized as a general multicast routing-table;
The multicast forwarding-table is used to control the forwarding of the multicast packets
directly.
The multicast routing table consists of a group of (S, G) entries, and (S, G) route represents
routing information from source S to group G. If the router supports multiple multicast routing
protocols, its multicast routing table will contain multicast routes generated from multiple protocols.
The router will chose the optimal multicast route according to multicast routing and forwarding
strategy, and send it to the multicast forwarding table.
The multicast routing protocol uses the RPF mechanism to establish the multicast routing entries,
thus to guarantee the multicast data being transferred in the correct path.

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