mVPN default to DATA MDT

chintan-shah · ‎03-18-2009

Hello ,

I have one confusion on switchover from default to data mdt for mVPN.

Say Singe Multicast source is sending Multicast stream to more than 1 Multicast group.

Now when i configure threshold to swithcover to DATA mdt on VRF at PE and if say traffic from source for one of the multicast stream cross threshold, will it switchover to data mdt for only that Multicast Group and soruce ( S,G) and for second multicast group it will be still default MDT. right ?

so threshold would trigger for each Multicast group not for one source ?

Also i configure threshold for burst traffic and burst could be for some microsecond, will it have switchover to Data MDT ?

regards,

Chintan

Harold Ritter · ‎03-18-2009

Hello Chintan,

By default a different data MDT would be started for each (s,g). The threshold therefore applies to each (s,g) individually rather than to all of the multicast streams in a specific VRF.

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

chintan-shah · ‎03-18-2009

Hi Hritter,

Thanks. It means that single source sendign traffic to two MC Group and i can still have Default MDT for one group and DATA MDT ( based on threshold) for second group from same source. right ?

Chintan

shivlu jain · ‎03-18-2009

Hi Chintan

For mVPN always there will be a one default mdt which is mandid and data mdt will be created on the basics of the threshold.

regards

shivlu jain

chintan-shah · ‎03-18-2009

Hi Shivlu,

That's correct. I was little confuse on how threshold will trigger, now it is clear to me that it is always (S,G) based as explained by Hritter.

Thanks,

Chintan

Harold Ritter · ‎03-18-2009

Chintan,

That is correct. In the same way, you could have two sources sending to the same group and one would be sending via a data MDT and the other via the default MDT. The decision to switch between the default and data MDT is made independently based on (s,g).

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

chintan-shah · ‎03-18-2009

Hi Hritt,er,

Thanks for clarification. Now, I am clear on this.

on other note, we have IP MTU 1500 in our core network, do we need to change this across core to take care of 24 byte GRE overhead when MDT is created ?

Because it might happen customer send Packet with 1500 byte, as far as customer has packet with less than 1476 it should be fine.

Regards,

Chintan