Question on Multicast VPN

[chintan-shah]

Hi,

In service provider to provide Multicast VPN to customer, they run PIM-SM or PIM-SSM. PIM-SM for default MDT.

PIM-SM require RP and i learnt that best to use Anycast RP.

Now, I have 13 locations having P route connected to form core. Do i need to run Anycast RP on each core local to location and run MSDP between them to exchange SA?

What should be best solution to support PIM-SM in Core for Multicast VPN on MPLS network ?

I guess, Custoemr RP,MSDP would be under VRF instance for each customer.

Please correct me if i am wrong , can suggest any good document.

Regards,

Chintan

[Harold Ritter]

Chintan,

RFC4610 defines Anycast RP without the need to run MSDP. This is currently not available in IOS, you therefore still need MSDP if you are going to deploy Anycast RP with IOS.

Regards

[Harold Ritter]

Chintan,

Sorry, I didn't read your question till the end. RFC4610 allows you to run Anycast RP without MSDP by having the RP receiving the register message to replicate this message to the other RP(s) in the RP set.

Section 3 of RFC4610 explains this mechanism in details.

http://www.ietf.or/rfc/rfc4610.txt?number=4610

Regards

[chintan-shah]

Hi Hritter,

Thanks for confirmation on non-avilability fo support for RFC4610 in IOS yet. So, I will keep MSDP still in some of few core routers in my design for mVPN design.

I will have a look on link given by you. Thanks for link.

Chintan

[Harold Ritter]

Just as a precision,the limitation is 256 multicast groups for data MDT per VRF per PE.

Regards

[chintan-shah]

Hi Hritter,

Thanks for clarification. Since limitation is 256 Multicast groups for DATA MDT per VRF.

One of our customer is looking for mVPN and have following requirements :

•Number of groups is currently 520 and increasing in the near future.

•Multicast currently 30Mbps moving towards 40Mbps soon and is very bursty in nature , could be microseconds burst up to 160 Mbps.

I will have to think of threshold value to switch over to Default to DATA first but major question is how do i accomodate 520 groups of customer where i have 255 limitation per VRF per Data MDT. in practical, there could be unlikely that all 520 will switchvoer to DATA MDT at at time but still if in worst case even 60% group reachces to threshold at one time due to burst for sometime, how can be it taken care with this limitation ??

Any of your suggetion welcome ?

[Harold Ritter]

Chintan,

It is certainly possible to go over 256 customer multicast streams. If you go over the limit, the data MDT groups will be reused for additional customer multicast streams.

Regards

[shivlu jain]

hi chintan

sorry i am late in discussion. As hritter already told that we need to reuse the groups even I told the same before.

hritter:- As per the requirement of chitan that customer is going to use 520 groups in this case the router need to reuse the groups again and again which may require lot of cpu processess and performance may degrade. What you suggets in this case is it wise to put the customer in same vrf or we can use the extranet feature for the same. This is my thought process.

regards

shivlu jain

[shivlu jain]

In addition to my above post can anyone tell when cisco is going to deploy anycast without RP or if it is in picture then which ios can be used for testing.

regards

shivlu jain

[chintan-shah]

Hi Shivlu,

Do you mean anycast without RP or without MSDP ??

Regards,

Chintan

[Harold Ritter]

Shivlu,

I assume you meant, Anycast without MSDP. Please contact your account team for any roadmap information on this feature.

Regards

[Harold Ritter]

Shivlu,

I think reusing the same data MDT group for 2 or 3 customer multicast streams is still preferable over using the default MDT for the same streams, assuming the streams are BW intensive. Extranet would certainly be an option but this feature is not currently available on all platforms.

Regards

[shivlu jain]

hritter

thanks for giving more clarification. I want to conform whether we can use the extranet or not, you explained it well.

regards

shivlu jain

[chintan-shah]

Hi Hritter, Shivu,

I have no knowlege on extranet Multicast and application of the same like what you guys explained in one of my customer scenario.

Can you please give little brief and point me to good document ??

Thanks again,

[Harold Ritter]

Chintan,

Extranet mVPN is simply the fact of receiving a multicast stream from one VRF to another (source in one VRF and receiver in the other). Here's a dicument describing the use of Extranet mVPN.

http://www.cisco.com/en/US/docs/ios/12_2sb/feature/guide/extvpnsb.html

Regards

[chintan-shah]

Hi Shivlu, Hritter,

Since router needs to reuse the groups again for more than 256 groups,and say router use same group for DATA MDT for two diff PE, wil the traffic go to both PE even C-Multicast group at both PE are different. ??

Regards,