We're Sorry, Full Content Access is for Members Only...

If you like to keep on reading, Become a Member Now! Here is Why:

  • Learn any CCNA, CCNP and CCIE R&S Topic. Explained As Simple As Possible.
  • Try for Just $1. The Best Dollar You've Ever Spent on Your Cisco Career!
  • Full Access to our 637 Lessons. More Lessons Added Every Week!
  • Content created by Rene Molenaar (CCIE #41726)


364 New Members signed up the last 30 days!


100% Satisfaction Guaranteed!
You may cancel your monthly membership at any time.
No Questions Asked!


Forum Replies

  1. Hi Rene

    First of all thanks a lot or sharing your knowledge. Your way of explanation is very simple & concise. Before start learning any particular topics ya concept, i check ur blog posting includes that topic or not. Jst now i find, Bi Directional PIM. Its so nice to learn from ur blogs. Appreciate the efforts. Thanks a lotzzzzzz…

  2. While labbing the same topology, i found something diff from ur configuration. Here it is:

    1. “ip pim bidir-enable” should be enable on R4 & R5 as well.
    2. “ip pim rp-address bidir” should be configured on R4 & R5 as well.

    Then only i am getting the same output as u mention in your most. Let me know i have done mistakes anywhere ya i understood it wrongly.

  3. Hi Michael,

    With “normal” PIM the designated router on the segment will encapsulate the first multicast data packet in a register message and forwards it to the RP. When the RP doesn’t want to receive this traffic, it sends a register stop message back to the designated router.

    It seems you understood it correctly. Any source can just start sending multicast traffic to the RP. There are no registration (stop) messages so it’s just being forwarded.


  4. Hi Rene,

    I really enjoy the way you teach and the content is very well organized.
    I have a question regarding PIM Bidirectional.
    For have in all Pim enabled Router the *,G to the RP on downstream Router, we need to enable globally the pim bidirectional.
    What if i have on third party router that doesnt’ support pim bidirectional? is it will be enable to from *,G to the RP?

  5. Hi Rene,

    I do not understand based on the last output shown below
    (Now we see FastEthenet0/0 as the Bidir-Upstream interface and FastEthernet0/1 in the outgoing list. This is something different than what you have seen before right?)

    Isn’t your earlier output already showing FastEthenet0/0 as the Bidir-Upstream interface and FastEthernet0/1 in the outgoing list?

    R3#show ip mroute    
    (*,, 00:09:39/00:03:10, RP, flags: BC
      **Bidir-Upstream: FastEthernet0/0**, RPF nbr
      **Outgoing interface list:**
    ... Continue reading in our forum

7 more replies! Ask a question or join the discussion by visiting our Community Forum