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Community Member

PIM sparse mode over FR hub and spoke

Hi  Gyus..

I have very simple topolgy,

http://www.palsharing.com/i/00034/bh5t1y5tnoee.jpg

R1 is the Hub, R2 nad R3 are spokes,

R2 joined to 224.10.10.10 on int loo 0

R3 will ping 224.10.10.10 from  its ser int

all interfaces configured with sparse-dense mode.

NBMA mode is enbled on the hub router although that the frame-relay supports Broadcast.

eigrp is the IGP between all links,

the fast ethernet int is currently disabled, i put it just to help me  figuring out the issue, when I used it instead of serial, multicast  traffic between R2 and R3 worked,

RP is static and installed on R1 loo0 interface

the problem is that when I pinged group 224.10.10.10 from R3 serial  interface or even loop interface I got reply only for the first rping,  then all ICMPs timed out. what happend is that R1 sends directly prune  meassge to the source instantly after adding (S,G).

here is the PIM debug output from R1 : as it shows it is not RPF issue:

*Mar  1 01:24:52.643: PIM(0): Received v2 Join/Prune on Serial0/0 from 192.168.1.2, to us
*Mar  1 01:24:52.647: PIM(0): Join-list: (*, 224.10.10.10), RPT-bit set, WC-bit set, S-bit set
*Mar  1 01:24:52.655: PIM(0): Check RP 1.1.1.1 into the (*, 224.10.10.10) entry
*Mar  1 01:24:52.659: PIM(0): Add Serial0/0/192.168.1.2 to (*, 224.10.10.10), Forward state, by PIM *G Join
*Mar  1 01:24:52.663: PIM(0): Prune-list: (192.168.1.3/32, 224.10.10.10) RPT-bit set
R1(config-if)#
*Mar  1 01:24:59.359: PIM(0): Received v2 Join/Prune on Serial0/0 from 192.168.1.2, to us
*Mar  1 01:24:59.363: PIM(0): Join-list: (192.168.1.3/32, 224.10.10.10), RPT-bit set, S-bit set

R1(config-if)#
*Mar  1 01:25:37.431: PIM(0): Received v2 Register on Serial0/0 from 192.168.1.2
*Mar  1 01:25:37.435: PIM(0): Send v2 Register-Stop to 192.168.1.2 for 0.0.0.0, group 0.0.0.0
R1(config-if)#
*Mar  1 01:25:52.055: PIM(0): Received v2 Join/Prune on Serial0/0 from 192.168.1.2, to us
*Mar  1 01:25:52.059: PIM(0): Join-list: (*, 224.10.10.10), RPT-bit set, WC-bit set, S-bit set
*Mar  1 01:25:52.063: PIM(0): Update Serial0/0/192.168.1.2 to (*, 224.10.10.10), Forward state, by PIM *G Join
*Mar  1 01:25:52.403: PIM(0): Building Periodic (*,G) Join / (S,G,RP-bit) Prune message for 224.10.10.10

1 REPLY
Community Member

Re: PIM sparse mode over FR hub and spoke

R1 configs:

R1(config-if)#do sh run | incl ip pim
  ip pim sparse-mode
  ip pim sparse-mode
  ip pim dr-priority 2
  ip pim nbma-mode
  ip pim sparse-mode
ip pim rp-address 1.1.1.1 1

interface Serial0/0
  ip address 192.168.1.1 255.255.255.0
  ip pim dr-priority 2
  ip pim nbma-mode
  ip pim sparse-mode
  encapsulation frame-relay
  clock rate 2000000
  frame-relay map ip 192.168.1.2 102 broadcast
  frame-relay map ip 192.168.1.3 103 broadcast

I just need help if these are all required configs to multicast to work or are there anything else?

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