CCIE OSPF Tutorial in Hindi

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CCIE OSPF Tutorial in Hindi
English | Size: 1.67 GB
Category: Tutorial

Thought it'd be good to add LSA types and various stub configuration.
Type 1 - Represents a router
Type 2 - Represents the pseudonode (designated router) for a multiaccess link
Type 3 - A network link summary (internal route)
Type 4 - Represents an ASBR
Type 5 - A route external to the OSPF domain
Type 7 - Used in stub areas in place of a type 5 LSA
Stub Areas
A stub area allows Type 2 and Type 3 LSAs. Type 5 LSAs are NOT passed into the area. The ABR injects a type 3 LSA containing a default route into the stub area.Filters the LSA-type 4 and 5.You will just have inter-area routes inside this area (routes with the "IO" code)
ABR(config-router)#area 51 stub
ABR(config-router)#area 51 default-cost 10
Defines the cost of a default route sent into the stub area. Default is 1.
INTERNAL(config-router)#area 51 stub

Note
All routers in the stub area must be configured with the area x stub command, including the Area Border Router (ABR).
Stub= No type 5 LSAs and default route

Totally Stubby Areas
This is Cisco proprietary.Like stub areas, totally stubby areas do not receive type-3 , type-4 or type-5 LSAs from their ABRs . All routing out of the area relies on the single default route injected by the ABR
ABR(config-router)#area 51 stub no-summary
INTERNAL(config-router)#area 51 stub

Note
Whereas all internal routers in the area are configured with the area x stub command, the ABR is configured with the area x stub no-summary command
Totally Stubby - ONLY Type 2 LSAs and default route

Not-So-Stubby Areas (NSSA)
This area is used when you are redistributing external routes. An NSSA makes use of type 7 LSAs, which are essentially type 5 LSAs in disguise. You will see "IO" routes (they are in the routing table because of the type-3 LSAs) also "N1/2″ routes which represents the NSSA area. This allows an ASBR to advertise external links to an ABR, which converts the type 7 LSAs into type 5 before flooding them to the rest of the OSPF domain.Type 3 LSAs will pass into and out of the area. Unlike a normal stub area, the ABR will NOT inject a default route into an NSSA unless explicitly configured to do so with
ABR(config-router)#area x nssa default-information originate
As traffic cannot be routed to external destinations without a default route, you'll probably want to include above command.
ABR(config-router)#area 1 nssa
INTERNAL(config-router)#area 1 nssa

Note
All routers in the NSSA stub area must be configured with the area x nssa command.
NSSA - Type 2, 3, and 7 LSAs with default route

Totally stub not-so-stubby area (totally NSSA)
This is Cisco proprietary.Filters type-3 ,type-4 and 5 LSAs, so inside the area you will only have a default route, besides the "N1/2″ routes that are normal on that type of area.
ABR(config-router)#area 11 nssa no-summary
INTERNAL(config-router)#area 11 nssa

Note
Whereas all internal routers in the area are configured with the area x nssa command, the ABR is configured with the area x nssa no-summary command.
Totally NSSA - Only Type 2 and 7 LSAs and default route

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