4 Command Line Interface

Command Usage

•All routers in a NSSA must be configured with the same area ID.

•An NSSA is similar to a stub, because when the router is an ABR, it can send a default route for other areas in the AS into the NSSA using the default- information-originate keyword. However, an NSSA is different from a stub, because when the router is an ASBR, it can import a default external AS route (for routing protocol domains adjacent to the NSSA but not within the OSPF AS) into the NSSA using the default-information-originate keyword.

•External routes advertised into an NSSA can include network destinations outside the AS learned via OSPF, the default route, static routes, routes imported from other routing protocols such as RIP, and networks directly connected to the router that are not running OSPF.

•NSSA external LSAs (Type 7) are converted by any ABR adjacent to the NSSA into external LSAs (Type-5), and propagated into other areas within the AS.

•Also, note that unlike stub areas, all Type-3 summary LSAs are always imported into NSSAs to ensure that internal routes are always chosen over Type-7 NSSA external routes.

•This router supports up to 16 total areas (either normal transit areas, stubs, or NSSAs).

Example

This example creates a stub area 10.3.0.0, and assigns all interfaces with class B addresses 10.3.x.x to the NSSA. It also instructs the router to generate external LSAs into the NSSA when it is an NSSA ABR or NSSA ASBR.

Console(config-router)#area 10.3.0.0 nssa default-information-originate Console(config-router)#network 10.3.0.0 255.255.0.0 area 10.2.0.0 Console(config-router)#

area virtual-link

This command defines a virtual link. To remove a virtual link, use the no form with no optional keywords. To restore the default value for an attribute, use the no form with the required keyword.

Syntax

[no] area area-idvirtual-link router-id

[authentication [message-digest null ]] [hello-interval seconds]

[retransmit-interval seconds] [transmit-delay seconds] [dead-interval seconds] [[authentication-key key] [message-digest-key key-idmd5 key]]

no area area-id

•area-id- Identifies the transit area for the virtual link. (The area ID must be in the form of an IP address.)

•router-id- Router ID of the virtual link neighbor. This must be an Area Border Router (ABR) that is adjacent to both the backbone and the transit area at the other end of the virtual link.

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Microsoft ES4625, ES4649 manual Area virtual-link
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ES4649, ES4625 specifications

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Overall, the Microsoft ES4625 and ES4649 offer a compelling combination of performance, flexibility, and security. They are engineered to support the increasingly complex demands of modern enterprise environments, making them a valuable investment for organizations seeking reliable, high-performing server solutions. Whether for virtualized workloads, cloud services, or heavy data computations, these servers are designed to deliver exceptional results.
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