PLANET WGS3-24240 - Manual (Page 324)

User’s Manual of WGS3-24000 / WGS3-24240
324
4.7.3 DVMRP
Distance Vector Multicast Routing Protocol is used to route multicast traffic to nodes which have requested a specific
multicast service via IGMP. To configure DVMRP, you must specify the routing metric, probe interval, and neighbor router
timeout.
DVMRP Overview -
„ Base on Distance Vector
。 Similar to RIP
。 Infinity = 32 hops
„ DVMRP uses the IGMP to exchange routing datagram
。 IP Protocol 0x02 (IGMP)
。 IGMP type 0x13 (DVMRP)
„ Similar to PIM DM
。 Broadcast and Prune operation
。 Uses DVMRP route table for RPF check
„ Route Table
。 Build source distribution trees
。 Perform multicast forwarding (RPF checks)
。 Periodic route updates (every 60 Seconds)
„ Concept of Virtual interfaces
。 Physical: Ethernet, FDDI, Token Ring
。 Tunnels: IP-in-IP tunnels
„ Version Compatibility
。 V1, V2 : No support Pruning and Generation ID
。 V3.0, v3.1, v3.2 : Have support Pruning but no support Generation ID
。 V1, V2 : No support Pruning and Generation ID
。 V3.0, v3.1, v3.2 : Have support Pruning but no support Generation ID
DVMRP Negihbor Discovery
z DVMRP Probe messages are periodically multicast to the all DVMRP Routers group address (224.0.0.4).
z Once you have received a Probe from a neighbor that contains your address in the neighbor list, your have established
a two-way neighbor adjacency with this router.