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Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) · Cisco
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the config as is it wrong. the interface is in the vrf, but the ospf process is not so it would be in the default vrf. also , the config indicates home office and site A, a customer would has access to these but not PE routers.
The router stops considering itself as the ABR connected to the MPLS Superbackbone The router will ignore the DN bit set in LSA-3, LSA-5 and LSA-7, and will not set this bit when doing redistribution into OSPF The router will ignore the tag value received in LSA-5 and LSA-7, and it will not set this value to any specific value when doing redistribution into OSPF https://community.cisco.com/t5/routing/where-to-configure-the-quot-capability-vrf-lite-quot-on-ce-or-pe/td-p/2812305
In addition to Jon's very good explanation, it is also noteworthy to mention that on Cisco routers, if an OSPF process is run in a VRF then it automatically and unconditionally considers itself to be an ABR - it believes to be connected to a so-called MPLS Superbackbone (even though there may be no BGP/MPLS configured on the router at all). This may pose problems if such a router is actually a part of a network that uses multiple areas. Consider the following scenario: R1 (VRF) --- Link in Area 1 --- R2 --- Link in Area 0 --- R3 Here, R2 is obviously an ABR because it has two links, one in Area 0, the other in Area 1. R1 is, by all means, an internal router in Area 1. However, because R1 runs the link toward R2, and OSPF over this link, in a VRF, R1 considers itself to also be an ABR toward the MPLS Superbackbone.