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DES-7200 Configuration Guide Chapter 2 Configuring BGP IP VPN
2-33
DES-7200(config-router)# address-family ipv4
DES-7200(config-router-af)# no neighbor 1.1.1.1 activate
DES-7200(config-router-af)# end
Scheme 2: Enabling label exchanging of IPv4 routes Between EBGP and IBGP Neighbors
In Scheme 1 (Enabling label exchanging of IPv4 routes Only Between EBGP Neighbors),
the IGP and LDP is one AS are required to maintain the PE routes from another AS. That is,
inter-AS PE routes should be advertised to each device on the AS. In view of the AS security in
actual applications, the PE routes of another AS are generally not advertised to each device on
the local AS. Instead, these routes should be owned by the BGP protocol so that they can be
transparent to the IGP and LDP in the local AS. You can enable label exchanging of IPv4 routes
between EBGP and IBGP neighbors.
This scheme differs from Scheme 1 in that the IGP on an ASBR is not required to redistribute
BGP routes and the LDP is not required to assign labels to BGP routes, though the LDP is still
responsible for the setup of the LSP in the local AS. The setup of an inter-AS LSP, however,
requires the label exchanging of IPv4 routes between both IBGP and EBGP neighbors. The PEs
are also required to push three consecutive layers of labels.
The configuration procedure is as follows:
Configuring Route Exchanging Between PEs and CEs
Configuring an IGP and MPLS Signaling Protocol in an AS
Setting Up an IBGP Session Between a PE and ASBR to Distribute Labels for IPv4 Routes
Setting Up an EBGP Session Between ASBRs to Exchange Labels Through IPv4 Routes
Configuring a Multi-Hop MP-EBGP Session
Configuring Route Exchanging Between PEs and CEs
This procedure is similar to Configuring Route Exchanging Between PEs and CEs and is not
described here.
Configuring an IGP and MPLS Signaling Protocol in an AS
This procedure is similar to Configuring an MPLS Network and is not described here.