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New Member

Multicasting - no RP assignment of multicast range

Hi,

Trying to run multicast (PIM-sparse-dense) over a LES100 connection, but though I have an IP PIM neighborship establised across it both ways, I do not see the PIM-Group to RP mappings at the far end. The same configurations have been applied to numerous LES1000 (not LES100) circuits with no issues, with the only exception of a Layer 2 only (Catalyst 2940)terminating the LES100 circuit.

I haven't exceeded my TTL boundary.

Any ideas what I should look for?

Thanks in advance

8 REPLIES
Hall of Fame Super Bronze

Re: Multicasting - no RP assignment of multicast range

You should look for RPF (Reverse Path Forwarding) failures between the mapping agent and the affected device.

'show ip mroute count' should indicate for any RPF failures.

From your diagram, I can't tell how the unicast routing looks like.

You can also enable debugging against mpacket on the 4500 and 3560.

'debug ip mpacket'

New Member

Re: Multicasting - no RP assignment of multicast range

Thanks for your comments.

Carrying out a debug ip mpacket on the 4500, I see it reports "not rpf interface" for the loopback of the RP, 147.184.15.244

May 24 13:45:18: IP(0): s=147.184.15.244 (Loopback0) d=224.0.1.40 id=49391, ttl=28, prot=17, len=48(48), not RPF interface

however the rpf check from the 4500 and traceroute look OK.

4500#sh ip rpf 147.184.15.244

RPF information for stvndcc02.ggr.co.uk (147.184.15.244)

RPF interface: GigabitEthernet3/1

RPF neighbor: ? (147.184.53.21)

RPF route/mask: 147.184.15.244/32

RPF type: unicast (ospf 11000)

RPF recursion count: 0

Doing distance-preferred lookups across tables

Type escape sequence to abort.

Tracing the route to stvndcc02.ggr.co.uk (147.184.15.244)

1 147.184.53.21 4 msec 0 msec 4 msec

2 147.184.53.10 0 msec 4 msec 0 msec

3 147.184.53.30 0 msec * 0 msec

What could be causing the "not rpf interface"?

Cisco Employee

Re: Multicasting - no RP assignment of multicast range

Paul,

Is PIM configured on the loopback interface? If not, this could be the issue.

Hope this helps,

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México 
Paseo de la Reforma 222 Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
New Member

Re: Multicasting - no RP assignment of multicast range

Hi, thanks, but PIM is enabled on the loopback.

Cisco Employee

Re: Multicasting - no RP assignment of multicast range

Paul,

Could you please post the configuration of lo0.

Thanks,

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México 
Paseo de la Reforma 222 Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
New Member

Re: Multicasting - no RP assignment of multicast range

Hi - Here are the configurations.

3560

!

interface Loopback0

ip address 139.136.4.246 255.255.255.255

ip pim sparse-dense-mode

!

4500

!

interface Loopback0

ip address 147.184.53.250 255.255.255.255

ip pim sparse-dense-mode

!

One of the downstream RP Switches which is not shown in the diagram.

6500

!

interface Loopback0

ip address 147.184.15.246 255.255.255.255

ip pim sparse-dense-mode

ip multicast ttl-threshold 32

ip multicast boundary 20

ip ospf cost 2

logging event link-status

!

access-list 20 permit 224.0.1.39

access-list 20 permit 224.0.1.40

access-list 20 permit 239.192.0.0 0.0.255.255

!

As you can see, we set a site boundary and TTL scoping for this MAN.

Hall of Fame Super Bronze

Re: Multicasting - no RP assignment of multicast range

Every device on the path has PIM enabled on their interfaces ?

I'm referring to this path:

1 147.184.53.21 4 msec 0 msec 4 msec

2 147.184.53.10 0 msec 4 msec 0 msec

3 147.184.53.30 0 msec * 0 msec

Also, ip multicast-routing in the global config ?

New Member

Re: Multicasting - no RP assignment of multicast range

Hi - All L3 interfaces have ip pim sparse-dense-mode configured and multicast is globally configured.

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