Quagga (Zebra) multiprotocol BGP configuration for IP multicast routing

Question

Host A: 
Eth1 = Multicast incoming from upstream provider
OpenVPN_interface_point_A = point to point interface with point B
ASN = 100

Host B: 
OpenVPN_interface_point_B = point to point interface with point A
ASN = 200

How exactly can I routing specific multicast address from Eth1 to OpenVPN_interface_point_B ?

Both Host A and B are running Quagga BGP version 4 (I know I need to change version 4+, that's not a problem in the future)

PoC Lab:

Router A configuration:

routerA# show run

Current configuration:
!
password quagga
!
router bgp 1
 bgp router-id 172.24.0.65
 network 172.24.0.64/30
 neighbor 172.24.0.66 remote-as 2
 neighbor 172.24.0.66 soft-reconfiguration inbound
!
 address-family ipv4 multicast
 network 10.101.16.128/27
 neighbor 172.24.0.66 activate
 exit-address-family
!
line vty
!
end

Router A BGP details:

routerA# show ip bgp sum
BGP router identifier 172.24.0.65, local AS number 1
RIB entries 1, using 112 bytes of memory
Peers 1, using 4568 bytes of memory

Neighbor        V         AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down  State/PfxRcd
172.24.0.66     4     2      35      43        0    0    0 00:17:28        1

Total number of neighbors 1

routerA# show ip bgp ipv4 multicast 
BGP table version is 0, local router ID is 172.24.0.65
Status codes: s suppressed, d damped, h history, * valid, > best, = multipath,
              i internal, r RIB-failure, S Stale, R Removed
Origin codes: i - IGP, e - EGP, ? - incomplete

   Network          Next Hop            Metric LocPrf Weight Path
*> 10.101.16.128/27 0.0.0.0                  0         32768 i

Total number of prefixes 1

Router B configuration:

routerB# show run

Current configuration:
!
password quagga
!
router bgp 2
 bgp router-id 172.24.0.66
 network 172.24.0.64/30
 neighbor 172.24.0.65 remote-as 1
 neighbor 172.24.0.65 soft-reconfiguration inbound
!
 address-family ipv4 multicast
 neighbor 172.24.0.65 activate
 exit-address-family
!
line vty
!
end

Router B detail:

routerB# show ip bgp sum
BGP router identifier 172.24.0.66, local AS number 2
RIB entries 1, using 112 bytes of memory
Peers 1, using 4568 bytes of memory

Neighbor        V         AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down  State/PfxRcd
172.24.0.65     4     1      43      47        0    0    0 00:23:55        1

Total number of neighbors 1
routerB# show ip bgp ipv4 multicast 
BGP table version is 0, local router ID is 172.24.0.66
Status codes: s suppressed, d damped, h history, * valid, > best, = multipath,
              i internal, r RIB-failure, S Stale, R Removed
Origin codes: i - IGP, e - EGP, ? - incomplete

   Network          Next Hop            Metric LocPrf Weight Path
*> 10.101.16.128/27 172.24.0.65              0             0 1 i

Total number of prefixes 1

Host 1 iperf command:

iperf -c 225.0.100.100 -u -t 0000 -i 1 -T 10

Router B iperf command:

iperf -s -u -B 225.0.100.100 -i 1

Router B still can't receive multicast packet

Answer 1

Multicast routing is different than your unicast routing protocols like BGP. PIM is the standard for multicast routing. Every router in the path must support a common multicast routing scheme (sparse, dense, or sparse/dense mode, and any RPs which are necessary), and that usually doesn't happen across ASes because you usually don't have control over neighbor ASes.

Normally, you would create a DVMRP tunnel from one end of the multicast path to the other end of the path, and then run multicast routing (PIM) through the tunnel. This doesn't affect your BGP configuration, other than making sure you can reach the other end of the tunnel with unicast, since the tunnel will encapsulate your multicast inside unicast packets.

Answer 2

How exactly can I routing specific multicast address from Eth1 to OpenVPN_interface_point_B ?

This is a configuration sketch to get you started.

Host A will send multicast source network 192.168.0.0/24 to Host B by using BGP.

! 1.1.1.1 = Host A
! 1.1.1.2 = Host B

! Host A - partial quagga config for bgpd
router bgp 100
 neighbor 1.1.1.2 remote-as 200
 address-family ipv4 multicast 
  network 192.168.0.0/24 !! replace 192.168.0.0/24 with network for multicast source
  neighbor 1.1.1.2 activate 
 exit-address-family 

! Host B - partial quagga config for bgpd
router bgp 200
 neighbor 1.1.1.1 remote-as 100
 address-family ipv4 multicast 
  neighbor 1.1.1.1 activate 
 exit-address-family