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Model B does not require the configuration of VPRN instances on ASBRs.

The ASBRs peer with each other to transport VPN-IPv4 routes between autonomous systems.

PE routers distribute VPN-IPv4 routes to their local ASBR.

One single ASBR is required in each AS to hold the routes for all VPRNs.

PE1 pushes a VPN label, a BGP label, and an LDP transport label on the IP packet.

CSC-CE1 pops the LDP label and swaps the BGP label.

CSC-PE1 pops the BGP label, swaps the VPN label, and pushes an LDP transport label.

CSC-PE2 pops the LDP and VPN labels and pushes a BGP label.

The route update sent from PE1.

The route update sent from PE2.

The route update sent from ASBR1.

The route update sent from ASBR2.

The ability to offer Internet connectivity and a variety of services over a single CSC VPRN interface.

The ability to maintain its own backbone.

The ability to learn system addresses of network provider PEs.

There is no need to manage end-customer services.

Show router bgp routes

Show router route-table summary

Show router bgp routes vpn-ipv4 detail

Show router route-table

Each PE must implement a policy to apply a unique SoO attribute to the set of routes received from each customer site.

A different BGP extended community is used on each PE that connects to a single site.

An import policy on the PE rejects a route if the attached SoO matches the configured value.

Import and export policies are applied on the PEs under the global BGP context.

RR2 advertises the VPN-IPv4 route update of 192.2.1.0/27 to RR1

RR1 advertises the VPN-IPv4 route update of 192.1.1.0/27 to RR2

RR2 advertises the VPN-IPv4 route update of 192.1.1.0/27 to PE2

PE1 advertises the VPN-IPv4 route update of 192.1.1.0/27 to RR1 and ASBRL

PE1 and PE2 advertise the same VPN route to the route reflector.

The route reflector receives two routes for prefix 10.1.1.0/24; one from PE1 and one from PE2.

The route reflector reflects two routes for prefix 10.1.1.0/24.

PE3 receives two routes and is able to load balance traffic across PE1 and PE2.

A

B

C

D

VPN-IPv4 routes are neither held, nor re-advertised, by the ASBRs.

Each ASBR propagates the routes received from its neighbor ASBR as labeled IPv4 routes in its own AS.

ASBRs exchange labeled IPv4 routes for the system addresses of PE routers.

ASBRs exchange customer routes as labeled IPv4 routes.