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New Member

The effects of IGP Shortcuts on Multicast RPF

Suppose I've turned on IGP Shortcuts on a TE Tunnel and now the route back to my Multicast source is through the tunnel, how does RPF handle this for non-labeled multicast traffic?

1 ACCEPTED SOLUTION

Accepted Solutions
Cisco Employee

Re: The effects of IGP Shortcuts on Multicast RPF

This would indeed cause the RPF to fail. There is a knob you can configure under OSPF and ISIS so that the RPF check could be performed on the OSPF or ISIS information rather than the TE info.

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
5 REPLIES
New Member

Re: The effects of IGP Shortcuts on Multicast RPF

Any update on this?

Cisco Employee

Re: The effects of IGP Shortcuts on Multicast RPF

This would indeed cause the RPF to fail. There is a knob you can configure under OSPF and ISIS so that the RPF check could be performed on the OSPF or ISIS information rather than the TE info.

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
Cisco Employee

Re: The effects of IGP Shortcuts on Multicast RPF

Oops, I have forgotten the most important thing, the knob itself.

mpls traffic-eng multicast-intact

Once again, it has to be configure under the ISIS or OSPF process.

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: The effects of IGP Shortcuts on Multicast RPF

Thanks, that helps. I saw that command but couldn't find the documentation.

Cisco Employee

Re: The effects of IGP Shortcuts on Multicast RPF

I couldn't find any documentation on CCO either. I will file a DDTS to get that correct.

In the meantime, let me know if you have any additional question about that command.

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
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