Brocade Multi-Service IronWare Routing Configuration Guide Manual de usuario descargar pdf (Pagina 278)

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Relationship to IP route table

Figure 17 shows an example of an IS-IS network.

FIGURE 17 An IS-IS network contains Intermediate Systems (ISs) and host systems

NOTE

Since the implementation of IS-IS does not route OSI traffic but instead routes IP traffic, IP hosts are

shown instead of ESs.

The other basic IS-IS concepts illustrated in this figure are explained in the following sections.

Domain and areas

IS-IS is an IGP, and thus applies only to routes within a single routing domain. However, you can

configure multiple areas within a domain. A Brocade device can be a member of one area for each

Network Entity Title (NET) you configure on the Brocade device. The NET contains the area ID for

the area the NET is in.

In Figure 17, Routers A, B, and C are in area 1. Routers D and E are in area 2. All the routers are in

the same domain.

Level-1 routing and Level-2 routing

You can configure an IS-IS router such as a Brocade device to perform one or both of the following

levels of IS-IS routing:

NOTE

The ISO/IEC specifications use the spelling “routing”, but this document uses the spelling “routing”

to remain consistent with other Brocade documentation.

• Level-1 – A Level-1 router routes traffic only within the area the router is in. To forward traffic to

another area, the Level-1 router sends the traffic to its nearest Level-2 router.

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