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Multicast, MPLS multiple AS Numbers

derekgaff
Level 1
Level 1

Trying to get Multicast working on MPLS test LAB. The LAB only has 4 PE's built in a ring topology. See Below

AS4-AS3

| |

AS1-AS2

I have a test VRF configured on AS1 and AS3, working fine. When I enable multicast the MDT tunnels are not built.

If I change all the PE's to be in the same BGP AS, the tunnels are built.

Am I missing something here.

Thanks in Advance.

8 Replies 8

Harold Ritter
Cisco Employee
Cisco Employee

Derek,

- What option do you use? Option 10a (back to back vrf), option 10b (ebgp VPNv4) or option 10c (ipv4 + label).

- Do you use ASM or SSM in the P-domain?

Could you pease post the configs.

Regards

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

Hriter, thanks for the swift reply. Please see attached configs for the two edge devices involved. All other devices just have multicast enabled on all interfaces.

Derek

Derek,

I just looked at the configurations you provided and noticed that the two routers are in the same AS. Assuming you simply change the AS on one of them, it would make it an option 10b scenario, in which case you will need to configure and activate the MDT AF between the two AS.

Regards

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

How do you do that, if you dont mind me asking.

D

Hi Hitter

Only available options I have for AF's are below.

multicast Address Family modifier

unicast Address Family modifier

vrf Specify parameters for a VPN Routing/Forwarding instance

Do I need to update IOS.

D

Hi Derek,

You need to upgrade to an IOS that does support MDT AF or to use MSDP between the ASes.

r1(config-router)#address-family ipv4 ?

mdt Address Family modifier

multicast Address Family modifier

tunnel Address Family modifier

unicast Address Family modifier

vrf Specify parameters for a VPN Routing/Forwarding instance

Configuring MDT AF would help if you want to use SSM between the two ASes.

You could also use ASM by running MSDP between the two routers and configuring them both as RPs.

Regards

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

Would you happen to know where I can get a sample configuration for ASM.

D

Certainly. Here's a good document from CCO:

Interdomain Multicast Solutions Using MSDP

http://www.cisco.com/en/US/docs/ios/solutions_docs/ip_multicast/Phase_1/mcstmsdp.html

Let me know if you have any questions

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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