Same Subnets

[Thomas Schmitt]

Hi

EDIT: thanks for Answer; now I have another Question and I thought I could use the same thread for it. It is often said, that you should use Loopback Interfaces as BGP neighbor address - what about CE - PE connection, if there are several VRF instances at PE Router? -Is there some trick or should I use connected Interface address?

If I use BGP/MPLS VPN, is it possible to use the sume subnets on both sites?

Something like this: 10.10.10.0 /24 <-> (IP add 10.10.10.1) CE1 <-> PE ...... PE <-> CE2 (IP add 10.10.10.2) <-> 10.10.10.0 /24

And I don't mean for different VRF, I mean in the same VRF.

thanks

[rsimoni · Accepted solution]

Hi Dmytro,

no you cannot advertise the same subnet from 2 different PE in the same vrf.

If you need L2 VPN (that is connecting to site having the same subnet) you need to go for AToM.

Or else you might try to configure 2 different /25 subnets but still route between them.

regards,

Riccardo

[Fabrizio Pedracini · Accepted solution]

EDIT: 
thanks for Answer; now I have another Question  and I thought I could use the same thread for it. It is often said, that  you should use Loopback Interfaces as BGP neighbor address - what about  CE - PE connection, if there are several VRF instances at PE Router?  -Is there some trick or should I use connected Interface address?

you need loopbacks for BGP vpnv4 peering inside the core. For PE<->CE you normally use the connected interface ip address to establish the neighborship.

cheers,

Fabrizio

PS: please use the "Reply" button rather then editing your original post, otherwise your additional questions might go unnoticed...

[rsimoni]

indeed, you should reply instead of editing a question as I did not see the new question.

please move the question to answered when you can.

Riccardo

[Thomas Schmitt]

OK, next time I will do so immediatly, to here my "edit Question" - thanks for replay

thanks for Answer; now I have another Question and I thought I could use the same thread for it. It is often said, that you should use Loopback Interfaces as BGP neighbor address - what about CE - PE connection, if there are several VRF instances at PE Router? -Is there some trick or should I use connected Interface address?

[rsimoni]

Hi Dmytro,

for eBGP sessions you should use interface addresses.

regards,

Riccardo