8 .Nd multicast connection mapper
11 .Op Fl d Ar debug_level
15 .Op Fl r Ar retry_count
16 .Op Fl t Ar timeout_count
17 .Op Ar starting_router
20 attempts to display all multicast routers that are reachable from the multicast
22 If not specified on the command line, the default multicast
27 traverses neighboring multicast routers by sending the ASK_NEIGHBORS IGMP
28 message to the multicast starting_router.
29 If this multicast router responds,
30 the version number and a list of their neighboring multicast router addresses is
31 part of that response.
32 If the responding router has recent multicast version
35 requests additional information such as metrics, thresholds, and flags from the
37 For each new occurrence of neighboring multicast router in
38 the reply and provided the flooding option has been selected, then
40 asks each of this multicast router for a list of neighbors.
42 for unique routers will continue until no new neighboring multicast routers
45 The following options are available:
46 .Bl -tag -width indent
49 When the debug level is greater than the
50 default value of 0, addition debugging messages are printed.
52 the debug level, an error condition, will always write an error message and will
56 Non-zero debug levels have the following effects:
57 .Bl -tag -width indent
59 packet warnings are printed to stderr.
61 all level 1 messages plus notifications down networks are printed to stderr.
63 all level 2 messages plus notifications of all packet
64 timeouts are printed to stderr.
68 Flooding allows the recursive search
69 of neighboring multicast routers and is enable by default when starting_router
72 Set graphing in GraphEd format.
74 Disable the DNS lookup for the multicast routers names.
75 .It Fl r Ar retry_count
76 Set the neighbor query retry limit.
78 .It Fl t Ar timeout_count
79 Set the number of seconds to wait for a neighbor query
80 reply before retrying.
81 Default timeout is 2 seconds.