Configuring IP Multicasting and Multimedia Services
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Parameter: Threshold
Path: Configuration Manager > Protocols > IP > Multicast > DVMRP > Tunnel
Default: 1
Options: 1 to 254 hops
Function: Specifies a TTL value for the tunnel. This value is the minimum IP TTL
required for a multicast datagram to be forwarded out this tunnel.
Instructions: Use this parameter to control the scope of the datagrams. If the IP TTL is less
than the threshold value you specify, the router drops the datagram.
MIB Object ID: 1.3.6.1.4.1.18.3.5.3.12.3.1.8
Parameter: Forward Cache Size
Path: Configuration Manager > Protocols > IP > Multicast > DVMRP > Tunnel
Default: 32
Options: 32 to 512 entries
Function: Specifies the maximum number of entries allowed in the forwarding table
associated with this tunnel interface.
Instructions: When configuring a cache size, you must also keep in mind the TTL value for
entries. If you specify a large cache size, a larger TTL value is recommended.
For a smaller cache, a shorter TTL for cache entries is recommended.
MIB Object ID: 1.3.6.1.4.1.18.3.5.3.12.3.1.16
Parameter: Forward Cache TTL
Path: Configuration Manager > Protocols > IP > Multicast > DVMRP > Tunnel
Default: 300
Options: 300 to 86400 seconds
Function: Specifies the TTL for an entry in the forwarding table.
Instructions: Select an appropriate value for your configuration.
MIB Object ID: 1.3.6.1.4.1.18.3.5.3.12.3.1.17
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