Multicast BGP configuration example

As shown in Figure 79, OSPF runs within AS 100 and AS 200 to ensure intra-AS connectivity. MBGP runs between the two ASs to exchange IPv4 unicast routes used for RPF check.

• Configure the Loopback 0 interface of Switch A and Switch B as the C-BSR and C-RP.

• Configure Switch A and Switch B to establish a Multicast Source Discovery Protocol (MSDP) peer relationship through MBGP, so that the receiver can receive multicast traffic from the source.

1. Configure IP addresses for interfaces and configure OSPF (this example uses OSPF process 1) in AS 200 to ensure intra-AS connectivity. (Details not shown.)

2. Enable IP multicast routing, PIM-SM, and IGMP, and configure BSR boundaries:

   # On Switch A, enable multicast routing globally, and enable PIM-SM on interfaces.

   <SwitchA> system-view
   [SwitchA] multicast routing
   [SwitchA-mrib] quit
   [SwitchA] interface vlan-interface 100
   [SwitchA-Vlan-interface100] pim sm
   [SwitchA-Vlan-interface100] quit
   [SwitchA] interface vlan-interface 101
   [SwitchA-Vlan-interface101] pim sm
   [SwitchA-Vlan-interface101] quit
   

   # Configure Switch B and Switch D in the same way that Switch A was configured.

   # On Switch C, enable multicast routing globally.

   <SwitchC> system-view
   [SwitchC] multicast routing
   [SwitchA-mrib] quit
   

   # Enable PIM-SM on interfaces, and enable IGMP on VLAN-interface 200.

   [SwitchC] interface vlan-interface 102
   [SwitchC-Vlan-interface102] pim sm
   [SwitchC-Vlan-interface102] quit
   [SwitchC] interface vlan-interface 104
   [SwitchC-Vlan-interface104] pim sm
   [SwitchC-Vlan-interface104] quit
   [SwitchC] interface vlan-interface 200
   [SwitchC-Vlan-interface200] pim sm
   [SwitchC-Vlan-interface200] igmp enable
   [SwitchC-Vlan-interface200] quit
   

   # Configure the BSR boundary on Switch A.

   [SwitchA] interface vlan-interface 101
   [SwitchA-Vlan-interface101] pim bsr-boundary
   [SwitchA-Vlan-interface101] quit
   

   # Configure the BSR boundary on Switch B.

   [SwitchB] interface vlan-interface 101
   [SwitchB-Vlan-interface101] pim bsr-boundary
   [SwitchB-Vlan-interface101] quit
   

3. Configure Loopback 0, C-BSR, and C-RP:

   # Configure the Loopback 0 interface and specify it as the C-BSR and C-RP on Switch A.

   [SwitchA] interface loopback 0
   [SwitchA-LoopBack0] ip address 1.1.1.1 32
   [SwitchA-LoopBack0] pim sm
   [SwitchA-LoopBack0] quit
   [SwitchA] pim
   [SwitchA-pim] c-bsr 1.1.1.1
   [SwitchA-pim] c-rp 1.1.1.1
   [SwitchA-pim] quit
   

   # Configure the Loopback 0 interface and specify it as the C-BSR and C-RP on Switch B.

   [SwitchB] interface loopback 0
   [SwitchB-LoopBack0] ip address 2.2.2.2 32
   [SwitchB-LoopBack0] pim sm
   [SwitchB-LoopBack0] quit
   [SwitchB] pim
   [SwitchB-pim] c-bsr 2.2.2.2
   [SwitchB-pim] c-rp 2.2.2.2
   [SwitchB-pim] quit
   

4. Configure BGP to establish BGP IPv4 multicast peers and redistribute routes:

   # On Switch A, establish an EBGP session to Switch B.

   [SwitchA] bgp 100
   [SwitchA-bgp-default] router-id 1.1.1.1
   [SwitchA-bgp-default] peer 192.168.1.2 as-number 200
   

   # Enable exchange of IPv4 unicast routes used for RPF check with Switch B.

   [SwitchA-bgp-default] address-family ipv4 multicast
   [SwitchA-bgp-default-mul-ipv4] peer 192.168.1.2 enable
   

   # Redistribute direct routes into BGP.

   [SwitchA-bgp-default-mul-ipv4] import-route direct
   [SwitchA-bgp-default-mul-ipv4] quit
   [SwitchA-bgp-default] quit
   

   # On Switch B, establish an EBGP session to Switch A.

   [SwitchB] bgp 200
   [SwitchB-bgp-default] router-id 2.2.2.2
   [SwitchB-bgp-default] peer 192.168.1.1 as-number 100
   

   # Enable exchange of IPv4 unicast routes used for RPF check with Switch B.

   [SwitchB-bgp-default] address-family ipv4 multicast
   [SwitchB-bgp-default-mul-ipv4] peer 192.168.1.1 enable
   

   # Redistribute OSPF routes into BGP.

   [SwitchB-bgp-default-mul-ipv4] import-route ospf 1
   [SwitchB-bgp-default-mul-ipv4] quit
   [SwitchB-bgp-default] quit
   

5. Configure MSDP peers:

   # Configure an MSDP peer on Switch A.

   [SwitchA] msdp
   [SwitchA-msdp] peer 192.168.1.2 connect-interface vlan-interface 101
   [SwitchA-msdp] quit
   

   # Configure an MSDP peer on Switch B.

   [SwitchB] msdp
   [SwitchB-msdp] peer 192.168.1.1 connect-interface vlan-interface 101
   [SwitchB-msdp] quit
   

# Verify the BGP IPv4 multicast peer information on Switch B.

[SwitchB] display bgp peer ipv4 multicast

 BGP local router ID : 2.2.2.2
 Local AS number : 200
 Total number of peers : 3                 Peers in established state : 3

  Peer            AS  MsgRcvd  MsgSent  OutQ PrefRcv Up/Down  State

  192.168.1.1    100       56       56     0       0 00:40:54 Established

# Verify the MSDP peer information on Switch B.

[SwitchB] display msdp brief
Configured   Established  Listen       Connect      Shutdown     Disabled
1            1            0            0            0            0

Peer address    State       Up/Down time    AS         SA count   Reset count
192.168.1.1     Established 00:07:17        100        1          0