Multicast traffic when streaming video from a source

[Aymeric Phan]

Hello everyone,

I have the following network topology in GNS3:

I want to stream a video from the source PC4 (Ubuntu) to all clients in the subnet 2001:db8:abcd:1::/64, and they are in the multicast group ff08::db8. What I know is that MLDv2 is configured in the local network 2001:db8:abcd:1::/64, and PIM need to be between router R1 and router R2. However, I dont understand how exactly is the configuration in these Cisco routers R1 and R2 to make things work. Can anyone please suggest or help me please? Thank you very much.

[Harold Ritter · Accepted solution]

Hi @Aymeric Phan ,

I am not sure how much has been configured already, but Here are a few steps that you want to make sure you configure.

- Configure "ipv6 unicast-routing" and "ipv6 multicast-routing" on R1 and R2

- Configure a loopback interface with an ipv6 address on R1 and R2.

- Configure a routing protocol for ipv6 on R1 and R2 (ospfv3 or other)

- Advertise all interfaces in the routing protocol (including interfaces facing the PCs). 

- Configure "ipv6 pim rp-address <R2 loopback interface ipv6 address>" on R1 and R2

That should be pretty much it.

Regards,

[Aymeric Phan]

Greetings Sir,

Thank you very much for your help. I followed your steps to configure and it worked when sending data from the source Ubuntu PC4 (which I set as server) to clients. However, the clients could not get the real-time data RTP from the streaming source when I used VLC. Maybe I had wrong configuration, so could you please flick through this configuration and give me some advice? The shortened configuration I had is down below:

---Router R1--- (Shortened output configuration)

Current configuration : 1540 bytes
!
version 15.2
service timestamps debug datetime msec
service timestamps log datetime msec
!
hostname R1
!
ip cef
ipv6 unicast-routing
ipv6 multicast-routing
ipv6 cef
!
!
multilink bundle-name authenticated
!
!
interface Loopback0
no ip address
ipv6 address 2001:DB8:ABCD:4::1/64
ipv6 ospf 1 area 0
!
interface GigabitEthernet0/0
no ip address
media-type gbic
speed 1000
duplex full
negotiation auto
ipv6 address 2001:DB8:ABCD:1::1/64
ipv6 ospf 1 area 0
!
interface GigabitEthernet1/0
no ip address
negotiation auto
ipv6 address 2001:DB8:ABCD:2::1/64
ipv6 ospf 1 area 0
!
ip forward-protocol nd
!
ipv6 pim rp-address 2001:DB8:ABCD:4::2
ipv6 router ospf 1
router-id 1.1.1.1
!
!
control-plane
!
!
line con 0
stopbits 1
line aux 0
stopbits 1
line vty 0 4
login
!
!
end

---Router R2--- (shortened output of configuration)

Current configuration : 1540 bytes
!
version 15.2
service timestamps debug datetime msec
service timestamps log datetime msec
!
hostname R2
!
ip cef
ipv6 unicast-routing
ipv6 multicast-routing
ipv6 cef
!
!
multilink bundle-name authenticated
!
!
interface Loopback0
no ip address
ipv6 address 2001:DB8:ABCD:4::2/64
ipv6 ospf 1 area 0
!
interface GigabitEthernet0/0
no ip address
media-type gbic
speed 1000
duplex full
negotiation auto
ipv6 address 2001:DB8:ABCD:3::1/64
ipv6 ospf 1 area 0
!
interface GigabitEthernet1/0
no ip address
negotiation auto
ipv6 address 2001:DB8:ABCD:2::2/64
ipv6 ospf 1 area 0
!
ip forward-protocol nd
!
ipv6 pim rp-address 2001:DB8:ABCD:4::2
ipv6 router ospf 1
router-id 2.2.2.2
!
!
control-plane
!
!
line con 0
stopbits 1
line aux 0
stopbits 1
line vty 0 4
login
!
!
end

The image of network topology is down below: 

[Harold Ritter · Accepted solution]

Hi @Aymeric Phan ,

At first glance, your configurations look good. What did you set the hop limit (ipv6 equivalent of ttl) in the VLC broadcast. I believe hop limit is 1 by default, which would explain why traffic doesn't make to the clients.

Regards,

[Aymeric Phan]

Hi Sir,

Thank you very much. The problem is exactly at the hop limit. I changed it to 3 and it worked perfectly. 

[Harold Ritter]

You are very welcome @Aymeric Phan and thanks for the feedback.