Dell PowerConnect M6220 Configuration Guide - Page 122

DVMRP, CLI Example, Prune messages

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DVMRP The Distance Vector Multicast Routing Protocol (DVMRP) is one of several multicast routing protocols you can configure on the switch (PIM-SM and PIM-DM are the others). Note that only one multicast routing protocol (MRP) can be operational on a router at any time. DVMRP is an interior gateway protocol; i.e., it is suitable for use within an autonomous system, but not between different autonomous systems. DVMRP is based on RIP: it forwards multicast datagrams to other routers in the AS and constructs a forwarding table based on information it learns in response. More specifically, it uses this sequence. • A new multicast packet is forwarded to the entire multicast network, with respect to the time-to-live (TTL) of the packet. • The TTL restricts the area to be flooded by the message. • All routers that do not have members on directly-attached subnetworks send back Prune messages to the upstream router. • The branches that transmit a prune message are deleted from the delivery tree. • The delivery tree which is spanning to all the members in the multicast group, is constructed in the form of a DVMRP forwarding table. CLI Example The following example configures two DVMRP interfaces. First, this example configures an OSPF router1 and globally enables IP routing and IP multicast. IGMP is globally enabled so that this router can manage group membership information for its directly-connected hosts (IGMP may not be required when there are no directly connected hosts). Next, DVMRP is globally enabled. Finally, DVMRP, IGMP, and OSPF are enabled on several interfaces. console#configure router ospf router-id 3.3.1.1 exit ip routing ip multicast ip igmp ip dvmrp interface vlan 15 routing ip address 3.3.3.1 255.255.255.0 ip dvmrp ip igmp ip ospf area 0 exit interface vlan 30 1. OSPF configuration is added as a unicast protocol for illustration purposes; static unicast routing could also be configured. 122 Multicast

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122
Multicast
DVMRP
The Distance Vector Multicast Routing Protocol (DVMRP) is one of several multicast routing protocols
you can configure on the switch (PIM-SM and PIM-DM are the others). Note that only one multicast
routing protocol (MRP) can be operational on a router at any time.
DVMRP is an interior gateway protocol; i.e., it is suitable for use within an autonomous system, but not
between different autonomous systems.
DVMRP is based on RIP: it forwards multicast datagrams to other routers in the AS and constructs a
forwarding table based on information it learns in response. More specifically, it uses this sequence.
•
A new multicast packet is forwarded to the entire multicast network, with respect to the time-to-live
(TTL) of the packet.
•
The TTL restricts the area to be flooded by the message.
•
All routers that do not have members on directly-attached subnetworks send back
Prune messages
to
the upstream router.
•
The branches that transmit a prune message are deleted from the delivery tree.
•
The delivery tree which is spanning to all the members in the multicast group, is constructed in the
form of a DVMRP forwarding table.
CLI Example
The following example configures two DVMRP interfaces. First, this example configures an OSPF
router
1
and globally enables IP routing and IP multicast. IGMP is globally enabled so that this router can
manage group membership information for its directly-connected hosts (IGMP may not be required
when there are no directly connected hosts). Next, DVMRP is globally enabled. Finally, DVMRP, IGMP,
and OSPF are enabled on several interfaces.
console#configure
router ospf
router-id 3.3.1.1
exit
ip routing
ip multicast
ip igmp
ip dvmrp
interface vlan 15
routing
ip address 3.3.3.1 255.255.255.0
ip dvmrp
ip igmp
ip ospf area 0
exit
interface vlan 30
1.
OSPF configuration is added as a unicast protocol for illustration purposes; static unicast routing could also be
configured.