Brocade Multi-Service IronWare Routing Configuration Guide Manual de usuario descargar pdf (Pagina 189)

100

101

Multi-Service IronWare Routing Configuration Guide 161

53-1003033-02

OSPF point-to-point links

FIGURE 11 AS External LSA reduction

Notice that both Router D and Router E have a route to the other routing domain through Router F.

OSPF eliminates the duplicate AS External LSAs. When two or more devices are configured as

ASBRs have equal-cost routes to the same next-hop router in an external routing domain, the ASBR

with the highest router ID floods the AS External LSAs for the external domain into the OSPF AS,

while the other ASBRs flush the equivalent AS External LSAs from their databases. As a result, the

overall volume of route advertisement traffic within the AS is reduced and the devices that flush

the duplicate AS External LSAs have more memory for other OSPF data. In Figure 11, since Router

D has a higher router ID than Router E, Router D floods the AS External LSAs for Router F to Routers

A, B, and C. Router E flushes the equivalent AS External LSAs from its database.

Algorithm for AS external LSA reduction

Figure 11 shows an example in which the normal AS External LSA reduction feature is in effect. The

behavior changes under the following conditions:

• There is one ASBR advertising (originating) a route to the external destination, but one of the

following happens:

• A second ASBR comes on-line

1 2 ... 184 185 186 187 188 189 190 191 192 193 194 ... 845 846

Comentarios a estos manuales

Sin comentarios

Brocade Multi-Service IronWare Routing Configuration Guide Manual de usuario Pagina 189

Comentarios a estos manuales

Relacionado con productos y manuales para Accesorios De Computador Brocade Multi-Service IronWare Routing Configuration Guide