IPv6 SSM Issue: INE Volumne 1 workbook (v5.019), section 9.28

Hi.

I'm having an issue with INE Volumne 1 workbook (v5.019), section 9.28.


I cannot get ping working, it is failing for me although the example shows it working on page 1472:
Rack2R6#ping ipv6 FF36::8 re 1000
Output Interface: FastEthernet0/0.146
Type escape sequence to abort.
Sending 1000, 100-byte ICMP Echos to FF36::8, timeout is 2 seconds:
Packet sent with a source address of 2001:1:0:146:223:4FF:FEE5:4278

Request 0 timed out
Request 1 timed out
Request 2 timed out
Request 3 timed out


My best guess is telling me that I am experiencing an RPF failure on R5.  A "show ipv6 mroute" shows a RPF interface of Serial0/0/0:
Rack2R5#sh ipv6 mroute
Multicast Routing Table
Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group,
       C - Connected, L - Local, I - Received Source Specific Host Report,
       P - Pruned, R - RP-bit set, F - Register flag, T - SPT-bit set,
       J - Join SPT
Timers: Uptime/Expires
Interface state: Interface, State

(*, FF76:640:2001:CC1E::8), 00:06:28/never, RP 2001:CC1E::6, flags: SCLJ
  Incoming interface: Serial0/0/1
  RPF nbr: FE80::223:4FF:FEE5:4290
  Immediate Outgoing interface list:
    FastEthernet0/0, Forward, 00:06:28/never

(2001:1:0:146:223:4FF:FEE5:4278, FF36::8), 00:06:28/never, flags: sLTI
  Incoming interface: Serial0/0/0
  RPF nbr: FE80::4
  Immediate Outgoing interface list:
    FastEthernet0/0, Forward, 00:06:28/never


However, a "show ipv6 route 2001:1:0:146:223:4FF:FEE5:4278" shows that the outbound interface is Serial0/0/1:
Rack2R5#sh ipv6 route 2001:1:0:146:223:4FF:FEE5:4278
Routing entry for 2001:1:0:146::/64
  Known via "eigrp 100", distance 90, metric 514560, type internal
  Redistributing via rip RIPNG
  Redistributing via ospf 1
  Backup from "rip RIPNG [120]"
  Route count is 2/2, share count 0
  Routing paths:
    FE80::223:4FF:FEE5:4290, Serial0/0/1
      Last updated 00:06:37 ago
    FE80::4, Serial0/0/0
      Last updated 00:06:36 ago


When I shutdown interface Serial0/0/0 on R5, the ping is successful as both the route and the route tables are pointing out the same interface.


With IPv4, I would modify the mroute table with the mroute command but it appears there is not an equivalent command with IPv6.


Any assistance on this one would be appreciated.

Thanks,
Rob

Comments

  • Hi,

      So you've identified your issue, it's related to routing. Why the SG is functional and you setup is not? For sure your IPv6 routing table is a bit different, have no idea where exactly you did things different. IPV6 static multicast routes are configured with command "ipv6 route .......multicast", so you configure a regular IPV6 static route with "multicast" keyword in the end.

    Good luck with your studies!

  • Hi,

    Thanks for the input.

    Also, how can I identify an RPF issue with IPv6?  I would have expected to see the "RPF failed" counter incrementing in the following output as in IPv4 but it didn't:

    Rack2R5#sh ipv6 mroute FF36::8 count
    IP Multicast Statistics
    60 routes, 12 groups, 0.08 average sources per group
    Forwarding Counts: Pkt Count/Pkts per second/Avg Pkt Size/Kilobits per second
    Other counts: Total/RPF failed/Other drops(OIF-null, rate-limit etc)
    Group: FF36::8
      Source: 2001:1:0:146:223:4FF:FEE5:4278,   Forwarding: 69/0/100/0, Other: 0/0/0
      Tot. shown: Source count: 1, pkt count: 69

     

    Thanks again!

  • Thanks for the assistance.  This post has helped me identify my issue as well...

     

    Using ipv6 route 2001:11:0:146:223:4FF:FE97:10E2/128 s0/1/0 multicast on r5 was my fix for this exercise.  This source address will vary for you...

Sign In or Register to comment.