Avaya Configuring IP Multicasting Services Manual de usuario Pagina 77

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Customizing DVMRP
117355-A Rev. A 4-25
Specifying a Threshold
Threshold values control the scope of datagram delivery. The threshold is the
minimum IP TTL required for a multicast datagram to be forwarded out a given
interface.
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.
T
able 4-2 lists
Originating TTL values recommended for certain types of multicast
applications
Threshold values recommended for routers to permit the forwarding of
packets from these applications
These values are recommended for topologies that will connect to the MBone.
Table 4-2. 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
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