
Customizing DVMRP
117355-D Rev 00
4-25
Estimating the Number of Routes
By default, DVMRP preallocates space for a routing table with 25 entries. You can
use the BCC or Site Manager to specify the number of entries (10 or more). For an
MBone (multicast backbone) implementation, a value of 3000 or higher is
recommended.
Note that routes are kept on a per-source-network basis, independent of multicast
groups. This number must include a route for every network that is local to an
interface configured for multicasting. Exceeding this size during router operation
will not cause an error, but may cause the router to consume more memory than
required.
Using the BCC
To reset the number of entries in the routing table, navigate to the global DVMRP
prompt (for example,
box; ip; dvmrp
) and enter:
estimated-routes
<route>
route
is an integer (10 or greater) indicating the estimated number of entries
needed in the routing table.
For example, the following command causes DVMRP to preallocate space for a
routing table with 50 entries:
dvmrp#
estimated-routes 50
dvmrp#
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