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ietf-wg-idr / draft-ietf-idr-sr-policy-safi

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RTG-DIR Issue 5: Introduction (Section 1) in paragraph 13 #7

Closed suehares closed 3 months ago

suehares commented 4 months ago

RTG-DIR Issue 5: Introduction (Section 1) in paragraph 13

Text:/ In some situations, it is undesirable for a controller or BGP egress router to have a BGP session to each policy headend. In these situations, BGP Route Reflectors may be used to propagate the advertisements. In certain other deployments, it may be necessary for the advertisement to propagate through a sequence of one or more ASes within an SR Domain (refer to Section 7 for the associated security considerations). To make this possible, an attribute needs to be attached to the advertisement that enables a BGP speaker to determine whether it is intended to be a headend for the advertised policy. This is done by attaching one or more Route Target Extended Communities to the advertisement [RFC4360]./

Jeffrey Question: How is further propagation prevented after the headend is reached?

suehares commented 3 months ago

This comment is closed. The reference is the paragraph:

-00-txt:/ An SR Policy intended only for the receiver will, in most cases, not traverse any Route Reflector (RR, [RFC4456])./