sourcing multicast from Loopback

Unanswered Question
Mar 15th, 2010
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Hi all,


I want to source a single multicast packet from a loopback interface every 30 seconds.

I used the following configuration:


ip sla 1
udp-echo 239.194.248.1 6666 source-ip 10.102.78.1 control disable
timeout 0
frequency 30
ip sla schedule 1 life forever start-time now


(10.102.78.1 = source ip loopback)



However, if i look down in my multicast network, it seems the switch is sourcing a single packet from EVERY active interface.

He is not sourcing a single packet from lo0 every 30 seconds, but a single packet every 30 seconds, on each active ip interface.


Anyone know how to prevent this ?

(running 12.2(33)SXI1 on C6500)



#sh ip mroute 239.194.248.1
IP Multicast Routing Table
Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected,
       L - Local, P - Pruned, R - RP-bit set, F - Register flag,
       T - SPT-bit set, J - Join SPT, M - MSDP created entry,
       X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
       U - URD, I - Received Source Specific Host Report, Z - Multicast Tunnel
       Y - Joined MDT-data group, y - Sending to MDT-data group
Outgoing interface flags: H - Hardware switched, A - Assert winner
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode


(*, 239.194.248.1), 3d00h/00:02:33, RP 10.102.90.20, flags: S
  Incoming interface: GigabitEthernet1/0/1, RPF nbr 10.96.2.89
  Outgoing interface list:
    FastEthernet1/0/1, Forward/Sparse, 3d00h/00:02:33 (ttl-threshold 16)


(10.102.78.1, 239.194.248.1), 00:11:08/00:03:29, flags: T
  Incoming interface: GigabitEthernet1/0/1, RPF nbr 10.96.2.89
  Outgoing interface list:
    FastEthernet1/0/1, Forward/Sparse, 00:11:08/00:03:12 (ttl-threshold 16)


(10.102.78.10, 239.194.248.1), 00:16:38/00:03:29, flags: T
  Incoming interface: GigabitEthernet1/0/2, RPF nbr 10.96.2.73
  Outgoing interface list:
    FastEthernet1/0/1, Forward/Sparse, 00:16:38/00:02:37 (ttl-threshold 16)


(10.102.78.14, 239.194.248.1), 00:16:38/00:03:29, flags: T
  Incoming interface: GigabitEthernet1/0/1, RPF nbr 10.96.2.89
  Outgoing interface list:
    FastEthernet1/0/1, Forward/Sparse, 00:16:38/00:02:37 (ttl-threshold 16)


(159.114.114.254, 239.194.248.1), 00:09:05/00:01:37, flags: T
  Incoming interface: GigabitEthernet1/0/1, RPF nbr 10.96.2.89
  Outgoing interface list:
    FastEthernet1/0/1, Forward/Sparse, 00:09:05/00:03:16 (ttl-threshold 16)


(159.114.126.254, 239.194.248.1), 00:08:45/00:01:37, flags: T
  Incoming interface: GigabitEthernet1/0/1, RPF nbr 10.96.2.89
  Outgoing interface list:
    FastEthernet1/0/1, Forward/Sparse, 00:08:45/00:02:35 (ttl-threshold 16)

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