BGP Outbound Request Filter Capability
BGP ORF, enabled by BGP Capabilities (discussed in Chapter 5), helps conserve resources during BGP route update processing. If the ORF capability is advertised by a neighbor during session establishment, this means that the local BGP speaker will allow its neighbor to push over its inbound prefix filter. After it's received, the local BGP speaker installs the filter, in addition to any locally configured outbound filters associated with the neighbor.
Several benefits are associated with BGP ORF:
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The local BGP speaker will no longer consume resources generating routing update messages that will be filtered by the neighbor on input.
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Link bandwidth will not be consumed by the routing updates.
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The neighbor ...
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