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Forums » Internetwork Expert Products » CCIE Service Provider Lab Workbook Volume II Version 1.0 » IEWB-SP Volume 2 Version 1.0 Lab 4 » Task 6.4 R4 can not ping 224.1.1.1
Latest post 07-20-2010 5:29 PM by rwcrowe. 3 replies.
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  • 09-07-2009 8:07 AM

    Task 6.4 R4 can not ping 224.1.1.1

    Reply Contact

    Hi,

     I have bump into an issue with pinging 224.1.1.1 from R4. Analyzing it I found that this is caused by MPLS TE on R2. The R2 receives PIM's packets from R4's loopback on s2/0. But according to its routing table R4's loopback is reachable via tunnel0 interface. All this cause RPF checkup failure (sh ip rpf 34.1.4.4 proves it). I have added "ip mroute 34.1.4.4 255.255.255.255 34.1.24.4" and everything works.

    After I searched this site for possible solutions and found a few of them not the same like mine one (http://ieoc.com/forums/t/1194.aspx). Therefore I'd like to ask if my thoughts are correct and solution to this issue also correct?

    Thank you.
    • Post Points: 20

  • 10-20-2009 2:27 AM In reply to

    Re: Task 6.4 R4 can not ping 224.1.1.1

    Reply Contact

    you are absolutely right!
    • Post Points: 5

  • 10-20-2009 2:30 AM In reply to

    Re: Task 6.4 R4 can not ping 224.1.1.1

    Reply Contact

    the problem is I am not running into this problem and I dont know why

    R2#sh ip rpf 34.2.4.4
    RPF information for ? (34.2.4.4)
      RPF interface: Serial2/0
      RPF neighbor: ? (34.2.24.4)
      RPF route/mask: 34.2.4.4/32
      RPF type: unicast (isis)
      RPF recursion count: 0
      Doing distance-preferred lookups across tables

    and

    R2#sh ip route isis
         34.0.0.0/8 is variably subnetted, 7 subnets, 2 masks
    i L1    34.2.6.6/32 [115/20] via 34.2.6.6, Tunnel246
    i L1    34.2.5.5/32 [115/10] via 34.2.25.5, FastEthernet1/0
    i L1    34.2.4.4/32 [115/10] via 34.2.4.4, Tunnel254
    i L1    34.2.0.0/24 [115/20] via 34.2.25.5, FastEthernet1/0
                        [115/20] via 34.2.4.4, Tunnel254

    R2#sh runn | inc mroute
    R2#
    • Post Points: 20

  • 07-20-2010 5:29 PM In reply to

    Re: Task 6.4 R4 can not ping 224.1.1.1

    Reply Contact

    Not sure if the material I have is dated (says v1.0) or not but the issue that it is trying to represent is Multicast going over a TE tunnel. When the RPF check is done and the egress interface is a TE tunnel, then RPF fails. The static mroute is one way around it. The other is "mpls traffic-engineering multicast-intact"
    • Post Points: 5
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