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DES-7200 Configuration Guide Chapter 2 Configuring BGP IP VPN
2-23
manner, the tunnel egress is not terminated on the local ASBR. Therefore, as long as the ASBR
redistributes the host route to the IGP in the local AS, the PEs can learn routes to the ASBR in
the other AS.
Enter the privilege mode and perform the following configuration procedure:
Command Function
DES-7200# configure terminal
Enter the global configuration mode.
DES-7200(config)# router igp
Enable an IGP that can be OSPF, RIP, or IS-IS.
DES-7200(config-router)#
redistribute connected subnets
Redistribute directly connected network segment
routes.
DES-7200(config-router)# show
running-config
View all configuration information.
# Configure the OSPF module on an ASBR to redistribute the directly connected network routes.
DES-7200# configure terminal
DES-7200(config)# router ospf 1
DES-7200(config-router)# redistribute connected subnets
Scheme 2: Next Hop Changed
When an ASBR receives VPN routes sent from the ASBR in another AS and sends the routes to
the PEs in the local AS, the next hop of the routes is changed. This mode is called the "OptionB
Next Hop Changed Scheme." In this mode, the PEs and ASBRs in the same AS can set up
MP-IBGP sessions to exchange VPN routes. Two ASBRs can set up MP-EBGP sessions to
exchange VPN routes. Upon receipt of a VPN route from another ASBR neighbor, an ASBR
changes the next hop as its own address when notifying the MP-IBGP peer in the AS of the
route.
The configuration procedure is as follows:
Configuring Route Exchanging Between PEs and CEs
Configuring an IGP and MPLS Signaling Protocol in an AS
Configuring an ASBR to Cancel the Default RT Filtering Function
Setting Up an MP-IBGP Session Between an ASBR and PE and Modifying the Next Hop
Address as its Own Address