Enterasys-networks Security Router X-PeditionTM Manual de usuario descargar pdf (Pagina 167)

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Overview

XSR User’s Guide 6-19

Route Reflectors

Route reflectors are an alternative to the requirement of a fully meshed network within an AS, as

illustrated in Figure 6-11. This approach allows a BGP speaker (known as a route reflector) to

advertise IBGP learned routes to certain IBGP peers. This is a variation from the standard IBGP

behavior of not re-advertising IBGP-learned routes to other IBGP speakers. But, if this rule is

relaxed, the number of IBGP sessions can be greatly reduced.

This functionality is configured with the

neighbor route-reflector-client command.

Figure 6-11 Route Reflector Applied to Minimize IBGP Mesh

As there are route reflector- compliant BGP speakers, some BGP speakers may not comply with

route reflector behavior. They can be either client or non-client group members. This situation

does not prohibit configuring reflectors, though. At first, you can configure one cluster with a

route reflector and some clients. You can consider all other IBGP speakers non-client peers to the

route reflector and add more clusters.

More than one route reflector can be associated with an AS. As such, a route reflector treats other

reflectors similar to other IBGP speakers and it can be configured to include other reflectors in a

client or non-client group. A rudimentary scenario would divide the backbone into multiple

clusters and each route reflector configured with other route reflectors as non-client peers (fully

meshing all reflectors). Clustered clients would be set up to keep IBGP sessions going with only

the reflector within.

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