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DES-7200 Configuration Guide Chapter 2 Configuring BGP IP VPN
2-25
DES-7200(config-router-af)#
neighbor pe-address activate
Enable the VPN route exchange with the peer.
DES-7200(config-router-af)#
neighbor pe-address
next-hop-self
Set the ASBR to modify the next hop as its own
address when sending VPN routes to the IBGP
neighbor.
DES-7200(config-router-af)#
show running-config
View all configuration information.
# Set up an MP-IBGP session, activate the VPN address family, and modify the next hop
address as the ASBR address.
DES-7200# configure terminal
DES-7200(config)# router bgp 1
DES-7200(config-router)# neighbor 1.1.1.1 remote-as 1
DES-7200(config-router)# neighbor 1.1.1.1 update-source loopback 0
DES-7200(config-router)# address-family vpnv4
DES-7200(config-router-af)# neighbor 1.1.1.1 activate
DES-7200(config-router-af)# neighbor 1.1.1.1 next-hop-self
DES-7200(config-router-af)# end
Setting Up an MP-EBGP Session Between ASBRs
This procedure is similar to Setting Up an MP-EBGP Session Between ASBRs in Scheme 1 and
is not described here.
Configuring Route Map Rules to Filter VPN Routes (Optional)
This procedure is similar to Configuring Route Map Rules to Filter VPN Routers (Optoinal) in
Scheme 1 and is not described here.
2.3.2.3 OptionC: Multi-Hop MP-EBGP Mode
Both OptionA and OptionB can meet the networking requirements of inter-AS VPNs. In these two
schemes, ASBRs are required to maintain and advertise VPN routes. If a large number of
inter-AS VPN routes should be advertised in each AS, the ASBRs may become the bottleneck of
further network expansion. To address this problem, a third scheme is developed, that is, the
multi-hop MP-EBGP. In the multi-hop MP-EBGP mode, the PEs in different ASs set up multi-hop
MP-EBGP sessions to directly exchange VPN routes. As a result, the ASBRs are not required to
maintain or advertise VPN routes.