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DES-7200 Configuration Guide Chapter 2 Configuring BGP IP VPN
2-114
DES-7200(config-if-GigabitEthernet 1/0)# no switchport
DES-7200(config-if-gigabitethernet 1/0)# ip address 30.30.30.1
255.255.255.0
# Enable label switching on an interface.
DES-7200(config-if-gigabitethernet 1/0)# label-switching
The configuration of ASBR2 is similar to that of ASBR1.
2.5.8 Inter-AS VPN OptionC: RR
Networking Scheme
In the two implementation modes of OptionC, another problem exists. If the sites of the same
VPN user are located at different ASs, a common OptionC scheme requires full mesh BGP
connections for the inter-AS PEs to ensure the connectivity of the VPN sites. As shown in the
following figure, the sites of the VPN user are at three different ASs. If a new VPN site is added,
the new site has to set up BGP connections with the other VPN sites. This restricts the
application of the common OptionC scheme. To address the preceding expansion problem, you
can add an RR to each AS in the OptionC scheme. The RRs set up multi-hop MP-EBGP
connections to exchange inter-AS VPN routes. At the same time, you can set up MP-IBGP
sessions between PEs and the RR in the AS.