
Configuring IP Multicasting and Multimedia Services
A-36
117355-D Rev 00
Parameter: Multicast Dynamic TTL
Path: Configuration Manager > Protocols > IP > OSPF/MOSPF > Global
Default: Disabled
Options: Enabled
|
Disabled
Function: Controls whether MOSPF uses a dynamic TTL threshold. Dynamic TTL means
that the TTL threshold may be different for each (source, group, downstream)
tuple.
Instructions: For maximum forwarding performance, disable this feature.
MIB Object ID: 1.3.6.1.4.1.18.3.5.3.2.3.1.28
Parameter: Multicast Downstream IGMP Relay
Path: Configuration Manager > Protocols > IP > OSPF/MOSPF > Global
Default: Disable
Options: Enable
|
Disable
Function: Specifies whether AS external routes are multicast capable. If you enable this
feature, the advertising ASBR sets the multicast bit in the ASE LSAs for those
routes, so that they can be used for multicast purposes.
Instructions: By default, all external routes are multicast capable. However, if you know that
an ASBR’s external routes can be used for unicast only, you must set this
parameter to Disable on the ASBR.
For example, consider two ASBRs -- ASBR1 and ASBR2 -- each with a BGP
connection to an ISP. You know that all multicast traffic should be injected into
the MOSPF domain by ASBR2 because ASBR2 has a DVMRP tunnel to the
MBone. To prevent ASBR1 from injecting multicast routes into the MOSPF
domain, you set this parameter to Disable.
MIB Object ID: 1.3.6.1.4.1.18.3.5.3.2.3.1.30
Komentarze do niniejszej Instrukcji