SMC Networks SMC6724L3 Manual do Utilizador descarregar pdf (Página 272)

C

ONFIGURING

THE

S

WITCH

3-224

Command Usage

Broadcasting periodically floods the

network with traffic from any active

multicast server. If IGMP snooping is

disabled, multicast traffic is flooded to all

ports on the router. However, if IGMP

snooping is enabled, then the first packet

for any source group pair is flooded to all

DVMRP downstream neighbors. If a

packet is received through an interface that

the router determines to be the shortest

path back to the source (based on interface

metrics), then the router forwards the

packet on all interfaces except for the

incoming interface.

The router will transmit a prune message

back out the receiving interface (i.e., the

parent interface) to its upstream

neighboring router if there are no group

members on its child interfaces. A prune

message tells the upstream router to stop

forwarding packets for a particular

source-group pair for the prune lifetime.

If the router that previously sent a prune

message now discovers a new group

member on one of its connections, it sends

a graft message to the upstream router.

When an upstream router receives this

message, it cancels the prune message. If

necessary, graft messages are propagated

back toward the source until reaching the

nearest live branch in the multicast tree.

source

flooding

potential

hosts

pruning

source

grafting

source

1 2 ... 267 268 269 270 271 272 273 274 275 276 277 ... 617 618

Comentários a estes Manuais

Sem comentários