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Configuring IP Multicasting and Multimedia Services
4-54
117355-C Rev 00
Configuring a Forwarding Table for a Tunnel
By default, DVMRP preallocates a forwarding table -- or cache -- for 32 entries.
You can use the BCC or Site Manager to specify the maximum number of entries
(from 32 to 512) allowed in the forwarding table associated with this tunnel
interface.
When configuring a cache size, you must also keep in mind the TTL value for
entries. If you specify a large cache size, you can specify a larger TTL value. A
smaller cache requires a smaller TTL for cache entries.
By default, DVMRP assigns a TTL value of 7,200 seconds to an entry in a tunnel
forwarding table. You can use the BCC or Site Manager to assign a value from
300 to 86,400 seconds.
Using the BCC
To specify the size of the forwarding table for a tunnel, navigate to a
tunnel-specific prompt and enter:
cache-size
<
entries
>
entries
is the number of entries that DVMRP preallocates for the forwarding table.
The default value is 32 entries.
To specify a timeout value for entries in the cache, navigate to a tunnel-specific
prompt and enter:
cache-timeout
<
seconds
>
seconds
is the timeout value in seconds. The default value is 7,200 seconds.
For example, the following commands cause DVMRP to preallocate a forwarding
table for 50 entries for tunnel 3.3.3.3/3.3.3.4. The timeout value for entries in this
table is 8,000 seconds.
dvmrp/3.3.3.3/3.3.3.4#
cache-size 50
dvmrp/3.3.3.3/3.3.3.4#
cache-timeout 8000
dvmrp/3.3.3.3/3.3.3.4#
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