Re: Multicast mvpn : simple topology doubts

Hi Gaurav,

Q1:
mdt default is used to setup the GRE tunnels between the PE routers. If
used without mdt data you multicast traffic is encapsulated into this
address and always send to all PE routers sharing this mdt default address.
mdt Data is used to optimize this in SSM multicast. This is done so that if
a PE is not interested in that traffic it will not receive that traffic.
Traffic with mdt data gets encapsulated into the give range. If you look at
the S,G entries in the core you will see the moment you start send
mutlicast traffic from a customer the PE will send out a S,G of the mdt
data address.With mdt data a RP is not needed as it is source specific
multicast
Q2:
I cannot see the purpose of doing that. You will have two separte multicast
networks. That is of the customer with its own RP and multicast tree and a
separate topology of the service provider core with and RP if you do not
use SSM
Q3:
in IOS XR the configuration is in general the same a different syntax
offcourse. The only thing I would like to highlight is when mdt data kicks
in. With IOS it is done immediatly but in IOS XR you can specify the
bandwidht threshold it needs to hit before switching over

Kind regards,

Maarten Vervoorn

2014-06-05 11:55 GMT+02:00 GAURAV MADAN <gauravmadan1177_at_gmail.com>:

> Hi All
>
> I am studying for SP CCIE and i admit that multicast is my weak area right
> from my R&S studies . I have following basic topology in gns which i am
> working on for basic mvpn.
>
> R1----------R2--------------R3--------------R4------------------R5
>
> R1 , R5 as CE
> R2,R3,R4 as provider routers
>
> R1-R2 :Eigrp
> R4-R5 : Eigrp
>
> My unicast is working fine.
>
> For mcast ; I did following :
>
> 1) enabled "sparse-mode" in core . Configured R2 as BSR RP
> 2) enabled multicast-routing for vrf TST on R2 and R4
> 3) configured my vrf dfinitions for mdt default and mdt data on R2 and R4
> 4)Enabled sparse mode on r1-r2 and r4-r5
> 5)For R2-R4 ; i enabled address-family ipv4 mdt"
>
> 6) for customer network ; I made R1 as BSR RP . I became known to R5 as
> well
> 7) Did a join grp on r1 and i can reach from r5.
>
> That being done ; can you please clarify following ( just so that i make
> sure that i have not made some false assumptions)
>
> Q1 : What exactly is purpose of mdt default and mdt data ??
> Q2 : Can we also have a customer network using the RP from provider ? I am
> if I make that address reachable to CE device ; can all the nodes in
> network agree on common RP and work smoothly ?
> Q3 : I am still to check out this in XR . Any point that you want to
> highlight in XR ?
>
> Regards
> Gaurav Madan
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html

Blogs and organic groups at http://www.ccie.net
Received on Thu Jun 05 2014 - 12:11:34 ART