Avaya Configuring IP Services Manual de usuario Pagina 292

  • Descarga
  • Añadir a mis manuales
  • Imprimir
  • Pagina
    / 466
  • Tabla de contenidos
  • MARCADORES
  • Valorado. / 5. Basado en revisión del cliente
Vista de pagina 291
Configuring IP Services
7-10
For mrouted compatibility, multicast datagrams originated by the router have a
TTL of 1. These datagrams are not compared against the TTL. Unicast datagrams
originated by the router (for example, for route reports issued via a tunnel) have a
TTL of 255. A datagram that is to be forwarded through a tunnel is first compared
against the threshold and, if accepted, is then encapsulated in an IP datagram with
a TTL of 64.
Table 7-1 lists the originating TTL values that are recommended for certain types
of multicast applications and the threshold values recommended for routers in
order to permit the forwarding of packets from these applications. These values
are recommended for topologies that will hook up to the MBone.
Configuring a Forwarding Table on an Interface
To keep to a minimum the amount of time that it spends looking up routes,
DVMRP creates and maintains a cache of frequently used routes — called a
forwarding table — for each IP interface.
Table 7-1. Recommended TTL and Threshold Values
Multicast Application TTL Threshold
IETF channel 1 low-rate GSM audio 255 224
IETF channel 2 low-rate GSM audio 223 192
IETF channel 1 PCM audio 191 160
IETF channel 2 PCM audio 159 128
IETF channel 1 video 127 96
IETF channel 2 video 95 64
Local event audio 63 32
Local event video 31 1
For information on using Site Manager to specify the maximum number of entries in a
DVMRP forwarding table, see the Forward Cache Size parameter on page 7-23. To
specify a time-to-live value for forwarding table entries, see the Forward Cache TTL
parameter on page 7-23.
Vista de pagina 291
1 2 ... 287 288 289 290 291 292 293 294 295 296 297 ... 465 466

Comentarios a estos manuales

Sin comentarios