What is totally not so stubby area in OSPF?
Note: the no-summary part needs to be added on R3 since that is where the summaries will be coming from. Let’s recap on what totally NSSA means… Totally not so stubby areas are areas where we expect a stub network, however we want to do some redistribution.
How does OSPF check stub area?
To configure the area as a normal stub area, enter the following command in OSPF configuration mode.
- Configuring stub area(config)#router ospf
- Configuring Totally Stub Area(config)#router ospf
- Configuring NSSA(config)#router ospf
What is totally NSSA in OSPF?
Totally Stubby areas are an extension of Stub Areas and are in fact, the most restricted type of OSPF area. In Totally Stubby Areas, the Routers receive only a default route from the ABRs, no External or Summary routes are allowed except for the default-route.
What is the difference between stub and totally stubby area?
A stub area is an area in which advertisements of external routes are not allowed, reducing the size of the database. A totally stubby area (TSA) is a stub area in which summary link-state advertisement (type 3 LSAs) are not sent. A default summary LSA, with a prefix of 0.0.
What is OSPF super backbone area?
The super- backbone appears as another area to the CE-routers. s. Routes redistributed into MP-BGP from OSPF will appear as inter-area routes in other OSPF sites if the original route was an intra-area or inter-area route and as external routes if the original route was an external route.
What is NSSA and totally NSSA?
Area 10 is not just NSSA, it is a totally NSSA. The difference is that stubby areas don’t allow any type 5 LSAs to get in, so if there are any type 5 LSAs to be advertised into the area, they are all replaced with a default route. But type 3 LSAs are permitted and are advertised.
What is difference between NSSA and totally NSSA?
NSSA: LSA 5+ LSA 4 are filtered in this area on ABR. into LSA 5 while leaving area boundry on ABR. Default Route is also generated manually. Totally NSSA: LSA 3 / LSA 5 / LSA 4 are filtered on ABR.
Why is Area 0 backbone area in OSPF?
Area 0 was chosen to be the backbone, the number 0 or 0.0. 0.0 is just a number. Because OSPF is link state the LSDB must be identical within an area. This is to ensure that the SPF calculation is consistent and to prevent routing loops.
What is totally stubby area in OSPF?
We are back with OSPF areas discussion and this time we will tackle about the Totally Stubby Area. You have to pronounce it right though if you know what I mean. Totally Stubby Area is a Cisco proprietary feature which works like a Stub Area but a stricter area type.
What is Cisco totally stubby area?
Totally Stubby Area is a Cisco proprietary feature which works like a Stub Area but a stricter area type. If Stub Area do not allow certain LSA Types like Type 4 and Type 5 LSAs, Totally Stubby area do not allow it as well plus no Type 3 LSA too.
Does the ABR have a default route for stubs?
The ABR (Router 2.2.2.2) does not have a default route If you change area 1 in the stub area example from a stub area to a totally stub area, the ABR still injects the 0.0.0.0 summary LSA into area 1. The only difference is that other summary LSAs are not sent into the totally stub area.
Is there a requirement for a second OSPF route?
Sorry, i also see no requirement for a second OSPF route. The difference between stub and totally stubby areas is only, that the ABR will not advertise other type 3 LSAs than the default route to that area.