BGP Extended Communities for OSPF PE-CE Routing-domain ID

To allow OSPF routing features to pass through the mpls vpn backbone network, some BGP extended group attributes need to be defined. OSPF attributes that can be passed through mp bgp include:

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The extended attribute of mp bgp allows OSPF routes to be completely rebuilt on the remote PE router. The lsa type allows the remote PE router to know what TYPE of routing is advertised in OSPF. If LSA = 1, LSA = 2, and LSA = 3, the remote PE will advertise an area to summarize the LSA Type 3) to the OSPF area.

Domain id tells the remote PE router whether it is an external OSPF route. If the domian id received by the pe router is the OSPF process ID by default) It cannot match the OSPF process ID of a specific VRF, this route will be advertised in the form of an OSPF external route LSA = 5) and metric Value Type 2. To support the redistribution of IP routing between different OSPF processes in the network. If yes, advertise the internal route. You can modify the domain id commandDomain-idDomain id.

If the option field is set, the external measurement value is type 2. If this parameter is not set, the external metric value is type 1.

Verification: see add for configuration

 

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View 1.1.1.1/32 on R5 (L0 of R1)

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On R6, because the domain id does not match the VRF, it will exist as an external route.

 

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If domian id = 52 is set on R

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Check 1.1.1.1/32 on R5.

 

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It is found that the vrf ospf process of domain id = 52 and R5 should be well matched by an internal route LSA = 3) Verification on R6

 

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