rfc9666v2.txt   rfc9666.txt 
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circuits between Outside Edge Routers and Inside Edge Routers. circuits between Outside Edge Routers and Inside Edge Routers.
Area Proxy Boundary multi-access circuits (i.e., Ethernets in LAN Area Proxy Boundary multi-access circuits (i.e., Ethernets in LAN
mode) with multiple Inside Edge Routers on them are not supported. mode) with multiple Inside Edge Routers on them are not supported.
The Inside Edge Router on any boundary LAN MUST NOT flood Inside The Inside Edge Router on any boundary LAN MUST NOT flood Inside
Router LSPs on this link. Boundary LANs SHOULD NOT be enabled for Router LSPs on this link. Boundary LANs SHOULD NOT be enabled for
Level 1. An Inside Edge Router may be elected as the Designated Level 1. An Inside Edge Router may be elected as the Designated
Intermediate System (DIS) for a Boundary LAN. In this case, using Intermediate System (DIS) for a Boundary LAN. In this case, using
the Area Proxy System ID as the basis for the LAN pseudonode the Area Proxy System ID as the basis for the LAN pseudonode
identifier could create a collision, so the Insider Edge Router identifier could create a collision, so the Insider Edge Router
SHOULD compose the pseudonode identifier using its built-in system SHOULD compose the pseudonode identifier using its originally
identifier. This choice of pseudonode identifier may confuse configured system identifier. This choice of pseudonode identifier
neighbors with an extremely strict implementation. In this case, the may confuse neighbors with an extremely strict implementation. In
Inside Edge Router may be configured with priority 0, causing an this case, the Inside Edge Router may be configured with priority 0,
Outside Router to be elected as the DIS. causing an Outside Router to be elected as the DIS.
2.1. Segment Routing 2.1. Segment Routing
If the Inside Area supports Segment Routing (SR) [RFC8402], then all If the Inside Area supports Segment Routing (SR) [RFC8402], then all
Inside Nodes MUST advertise a Segment Routing Global Block (SRGB). Inside Nodes MUST advertise a Segment Routing Global Block (SRGB).
The first value of the SRGB advertised by all Inside Nodes MUST start The first value of the SRGB advertised by all Inside Nodes MUST start
at the same value. If the Area Leader detects SRGBs that do not at the same value. If the Area Leader detects SRGBs that do not
start with the same value, it MUST log an error and not advertise an start with the same value, it MUST log an error and not advertise an
SRGB in the Proxy LSP. The range advertised for the area will be the SRGB in the Proxy LSP. The range advertised for the area will be the
minimum of that advertised by all Inside Nodes. minimum of that advertised by all Inside Nodes.
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