When OSPF routing was heavy distributed to BGP, OSPF routing type is not be retained, all from customer OSPF routing will be inserted as type 5 and spread to other, lsas customer sites, so will result in, OSPF routing consolidation …
When OSPF routing was heavy distributed to BGP, OSPF routing type is not be retained, all from customer OSPF routing will be inserted as type 5 and spread to other, lsas customer sites, so will result in, OSPF routing consolidation and peripheral area cannot be executed.Superbackbone is the OSPF MPLS VPN to solve this problemBelow for two solutions:1. By default, the same VPN in all the routers process – the PE id must be the same, no just, through the MPLSVPN backbone of regional transmit OSPF routing, will beAs exterior routing (5 types of lsas) to join the local OSPF domain, not domain 3 between routing types lsas).2. Can use domain – id to control the process.In each stage of PE PE – CE OSPF process configuration of the same domain IDOspf router 10 type VRF (variable refrigerant flowrate) OADomain – id 10.10.10.10In a MPLS VPN, OSPF put MPLSVPN domain as a Superbackbone, so, PE and CE made between OSPF, you can have straight even regional announced to any region, such as area1 even area 0, all can. Because in MPLS VPN seems superbackbone is the highest.Doing PE with CE, PE between OSPF above OSPF process number by default is what we call the Domain – ID, for example, if the routerVpna then this ospf 1 type VRF (variable refrigerant flowrate) PE ospf domain – id is 0.0.0.1, and another router ospf with PE if2 type VRF (variable refrigerant flowrate)Vpna, then domain – id is 0.0.0.2, when they imported from MP – BGP when OSPF routing will put routing domain – id and their own domain – id compare, if two domian – id the same then considered a domain, transfer the past is in the form of OIA on end looks is a regional routing, if domian – id different then considered a exterior routing, transfer the past is OE routing, is an external type 5 routing. So, you in PE when above configuration OSPF or it has to say, you have them, the same set of process, domain – id is same, so if we are well equipped to modify the OSPF, cannot domian – is there any way can put into the same id Settings? This of course, we can in OSPF type VRF (variable refrigerant flowrate) routing mode operation, for example:A router ospf 2 type VRF (variable refrigerant flowrate)Domain – id 0.0.0.1Modified into as ends! So we see from CE end OIA routing the routing is, inside this say not all routing is CE2 OIA types, such as a RIP the released again into OSPF routing, forming type 5 CE1 through our VPN arrived that the time is still type 5 routing, frankly speaking just domain – id the same circumstances, we guarantee that OSPF when in through the VPN original attribute is no change!!!Also, the MP – BGP the ospf underType VRF (variable refrigerant flowrate) when the routing released again learned ah, if you remember, the default without learned only released an internal routing to MP – again, if want to BGP external1 external 2 also through the MP – BGP end-to-end CE transfer to words, we must add a learned parameters:R1 (router config – - af) # redistribute ospf 1 type VRF (variable refrigerant flowrate) a learned an internalExternal 1 external 2Remember: received OSPF routing is and own Domian – id comparison!
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