multicast registration process

Hi all

R6==========R4=========R5
source RP

R4 is connected to R5 with two S1/1 and S1/0

 R6 registrations are coming in non PIM enabled interface

*Mar 1 01:25:21.519: PIM(0): Received v2 Register on Serial1/0 from
155.1.146.6
*Mar 1 01:25:21.523: PIM(0): Send v2 Register-Stop to 155.1.146.6 for
0.0.0.0, group 0.0.0.0

R5#show ip pim interface

Address Interface Ver/ Nbr Query DR DR
                                          Mode Count Intvl Prior
150.1.5.5 Loopback0 v2/SD 0 30 1
 150.1.5.5
155.1.58.5 FastEthernet0/0 v2/SD 1 30 1
 155.1.58.8
155.1.45.5 Serial1/1 v2/SD 1 30 1
 0.0.0.0

pim is not enabled on s1/0 , on which the register was received

traceroute to source goes via s1/1 . ie shortest path back to source is
via s1/1
R5#traceroute 155.1.146.6

Type escape sequence to abort.
Tracing the route to 155.1.146.6

  1 155.1.45.4 60 msec 44 msec 4 msec
  2 155.1.146.6 64 msec 88 msec 8 msec

*Question*: PIM register messages are subjected to RPF check . ie
 should land on interface , from which router sends unicast traffic back
to source .

here routers unicast path back is via 155.1.45.4 ie s1/1
R5#traceroute 155.1.146.6

Type escape sequence to abort.
Tracing the route to 155.1.146.6

  1 155.1.45.4 60 msec 44 msec 4 msec
  2 155.1.146.6 64 msec 88 msec 8 msec

Register messages come in via s1/0

PIM(0): Received v2 Register on Serial1/0 from 155.1.146.6

Register stop message was sent ....and not said " NOT AN RPF interface "

what could be reason ? ios image exception ?

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Received on Thu Jan 09 2014 - 18:52:33 ART