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diya

PIM sparse mode over FR hub and spoke

2 posts in this topic

Hi Gyus..

 

I have very simple topolgy,

 

 

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

Edited by diya
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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

 

 

 

are these all required configs to multicast to work?

Edited by diya
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