Avaya Configuring IP Services Bedienungsanleitung Seite 290

  • Herunterladen
  • Zu meinen Handbüchern hinzufügen
  • Drucken
  • Seite
    / 466
  • Inhaltsverzeichnis
  • LESEZEICHEN
  • Bewertet. / 5. Basierend auf Kundenbewertungen
Seitenansicht 289
Configuring IP Services
7-8
If neighboring routers have the same metric to a given source network, the router
with the lower IP address will be responsible for propagating multicast traffic
originating from that source network onto the network or tunnel that is common to
these neighboring routers.
Identifying a Leaf Network
A network that is not on the shortest path from a source network to a multicast
router is considered to be a leaf. In Figure 7-1, the network connected to Router E
— Net 5 — is a leaf network.
Pruning a Shortest-Path Tree
If a host drops out of a multicast group, multicast routers may continue to forward
group messages to that host. DVMRP routers use a technique called pruning to
avoid the waste of network resources caused by the transmission of group
messages to hosts that are no longer members of the group.
The following conditions cause DVMRP to prune the shortest-path tree for a
given group:
1. The router determines that the attached network on which the host is located
(or any other locally attached network) has no active member of the group.
2. The router determines that all neighbors on all attached networks other than
the next-hop network to the source have pruned off the source and group.
3. The router determines that it is not located on the shortest network path to any
remote network that includes a member of the group.
4. The router sends a DVMRP PRUNE message to its DVMRP neighbor. The
neighbor removes the router from its forwarding table.
If the host later rejoins the group, the router sends the neighbor a DVMRP
GRAFT message. The router restores the router to its forwarding table.
For instructions on using Site Manager to enable pruning on a multicast router, see the
Pruning Enable parameter on page 7-19.
Seitenansicht 289
1 2 ... 285 286 287 288 289 290 291 292 293 294 295 ... 465 466

Kommentare zu diesen Handbüchern

Keine Kommentare