Dell PowerConnect M6220 Configuration Guide - Page 123

PIM, PIM-SM, Example: PIM-SM

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routing ip address 1.1.1.1 255.255.255.0 ip dvmrp ip igmp ip ospf area 0 exit exit PIM Protocol Independent Multicast (PIM) is a standard multicast routing protocol that provides scalable inter-domain multicast routing across the Internet, independent of the mechanisms provided by any particular unicast routing protocol. PIM has two types: • PIM-Dense Mode (PIM-DM) • PIM-Sparse Mode (PIM-SM) PIM-SM PIM-SM is used to efficiently route multicast traffic to multicast groups that may span wide area networks where bandwidth is a constraint. PIM-SM uses shared trees by default and implements source-based trees for efficiency; it assumes that no hosts want the multicast traffic unless they specifically ask for it. It creates a shared distribution tree centered on a defined rendezvous point (RP) from which source traffic is relayed to the receivers. Senders first send the multicast data to the RP, which in turn sends the data down the shared tree to the receivers. Shared trees centered on an RP do not necessarily provide the shortest, most optimal path. In such cases, PIM-SM provides a means to switch to more efficient source-specific trees. A data threshold rate is configured to determine when to switch from shared-tree to source-tree. PIM-SM uses a Bootstrap Router (BSR), which advertises information to other multicast routers about the RP. In a given network, a set of routers can be administratively enabled as candidate bootstrap routers. If it is not apparent which router should be the BSR, the candidates flood the domain with advertisements. The router with the highest priority is elected. If all the priorities are equal, then the candidate with the highest IP address becomes the BSR. PIM-SM is defined in RFC 4601. Example: PIM-SM The following example configures PIM-SM for IPv4 on a router. First, configure an OSPF1 router and globally enable IP routing, multicast, IGMP, and PIM-SM. Next, configure a PIM-SM rendezvous point with an IP address and group range. The IP address will serve as an RP for the range of potential multicast groups specified in the group range. Finally, enable routing, IGMP, PIM-SM, and OSPF on one or more interfaces. Multicast 123

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Multicast
123
routing
ip address 1.1.1.1 255.255.255.0
ip dvmrp
ip igmp
ip ospf area 0
exit
exit
PIM
Protocol Independent Multicast (PIM) is a standard multicast routing protocol that provides scalable
inter-domain multicast routing across the Internet, independent of the mechanisms provided by any
particular unicast routing protocol.
PIM has two types:
•
PIM-Dense Mode (PIM-DM)
•
PIM-Sparse Mode (PIM-SM)
PIM-SM
PIM-SM is used to efficiently route multicast traffic to multicast groups that may span wide area
networks where bandwidth is a constraint.
PIM-SM uses shared trees by default and implements source-based trees for efficiency; it assumes that
no hosts want the multicast traffic unless they specifically ask for it. It creates a shared distribution tree
centered on a defined rendezvous point (RP) from which source traffic is relayed to the receivers.
Senders first send the multicast data to the RP, which in turn sends the data down the shared tree to the
receivers. Shared trees centered on an RP do not necessarily provide the shortest, most optimal path. In
such cases, PIM-SM provides a means to switch to more efficient source-specific trees. A data threshold
rate is configured to determine when to switch from shared-tree to source-tree.
PIM-SM uses a Bootstrap Router (BSR), which advertises information to other multicast routers about
the RP. In a given network, a set of routers can be administratively enabled as candidate bootstrap
routers. If it is not apparent which router should be the BSR, the candidates flood the domain with
advertisements. The router with the highest priority is elected. If all the priorities are equal, then the
candidate with the highest IP address becomes the BSR.
PIM-SM is defined in RFC 4601.
Example: PIM-SM
The following example configures PIM-SM for IPv4 on a router.
First, configure an OSPF
1
router and globally enable IP routing, multicast, IGMP, and PIM-SM. Next,
configure a PIM-SM rendezvous point with an IP address and group range. The IP address will serve as an
RP for the range of potential multicast groups specified in the group range. Finally, enable routing,
IGMP, PIM-SM, and OSPF on one or more interfaces.