203
Item Network re
uirements
PE interfaces and
VPN instances to
which they belong
• PE 1: GigabitEthernet 2/1/2 belongs to VPN instance a. GigabitEthernet 2/1/3
belongs to VPN instance b. GigabitEthernet 2/1/1 and Loopback 1 belong to the
public network instance.
• PE 2: GigabitEthernet 2/1/1, GigabitEthernet 2/1/2, Loopback 1, and Loopback 2
belong to the public network instance.
• PE 3: GigabitEthernet 2/1/1, GigabitEthernet 2/1/2, Loopback 1, and Loopback 2
belong to the public network instance.
• PE 4: GigabitEthernet 2/1/2 belongs to VPN instance a. GigabitEthernet 2/1/3
belongs to VPN instance b. GigabitEthernet 2/1/1 and Loopback 1 belong to the
public network instance.
Unicast routing
protocols and MPLS
• Configure OSPF separately in AS 100 and AS 200, and configure OSPF between
the PEs and CEs.
• Establish BGP peer connections between PE 1, PE 2, PE 3, and PE 4 on their
respective Loopback 1, and exchange all VPN routes between them.
• Configure MPLS separately in AS 100 and AS 200.
IP multicast routing
• Enable IP multicast routing on the public network on PE 1, PE 2, PE 3, and PE 4.
• Enable IP multicast routing in VPN instance a on PE 1 and PE 4.
• Enable IP multicast routing in VPN instance b on PE 1 and PE 4.
• Enable IP multicast routing on CE a1, CE a2, CE b1, and CE b2.
IGMP
• Run IGMPv2 on GigabitEthernet 2/1/1 of CE a2.
• Run IGMPv2 on GigabitEthernet 2/1/1 of CE b2.
PIM
• Enable PIM-SM on all public network interfaces of PE 2 and PE 3.
• Enable PIM-SM on all public and private network interfaces of PE 1 and PE 4.
• Enable PIM-SM on all interfaces that do not have attached receiver hosts on CE a1,
CE a2, CE b1, and CE b2.
• Configure Loopback 2 of PE 2 and PE 3 as a C-BSR and a C-RP for their own AS to
provide services for all multicast groups.
• Configure Loopback 0 of CE a1 as a C-BSR and a C-RP for VPN instance a to provide
services for all multicast groups.
• Configure Loopback 0 of CE b1 as a C-BSR and a C-RP for VPN instance b to provide
services for all multicast groups.
MSDP Establish an MSDP peering relationship between PE 2 and PE 3 on their Loopback 1.