Problem with Multicast over BVI interface ?

[mohsen.hosseini]

Hi

We provide ADSL services for our customers (with PPPOE).

some of our Customers need VPN Service for their clients , for that we used the Cisco 3661 Router with BVI interface to

provide Layer 2 protocol for them.

some of our Customers want to run OSPF over their LAN (that we Provide for them), but our problem is that Multicast

Packets (224.0.0.5 and 224.0.0.6) does not transfer between Customer Routers , this is true about other multicast packets ,

for example CDP.

----------------------

ip cef

vpdn enable

!

vpdn-group 1

accept-dialin

protocol pppoe

virtual-template 2

pppoe limit per-vc 1000

!

bridge irb

interface BVI110

ip address 10.10.10.100 255.255.255.0

!

interface FastEthernet0/0

pppoe enable

interface FastEthernet0/0.916

encapsulation dot1Q 916

no ip route-cache

no ip mroute-cache

bridge-group 110

interface FastEthernet0/0.917

encapsulation dot1Q 917

no ip route-cache

no ip mroute-cache

bridge-group 110

----------------------

Any feedback on this would be greatly appreciated.

Regards,

M.Hosseini

[Richard Burts]

I am not sure that I understand clearly your question. I will suggest some answers and if they are not what you need then perhaps you can clarify the question.

You mention using VPN. You can not send multicast like OSPF over normal IPSec VPN. This is because IPSec processes unicast not multicast traffic. If you want to send multicast over IPSec VPN then you need to implement IPSec VPN with GRE tunnels. This will allow multicast to be sent. I have done this for several situations at customer sites and it works well.

I am not sure what you are trying to do with the two subintefaces (FastEthernet0/0.916 and FastEthernet0/0.917). It appears that you are connected to a switch which has defined two VLANs. But when you put the same bridge group on both subintefaces then you are bridging the two VLANs together and creating a loop.

HTH

Rick