What does RFC 1583 compliance mean

The rfc1583 compatible command is used to enable a device to support the route selection rules defined in RFC 1583. After the undo rfc1583 compatible command is run:

If there are two paths from a device to an ASBR, of which one is within a backbone area and the other is within a non-backbone area, the path within non-backbone areas will be selected.
If the paths from a device to an ASBR are all within non-backbone areas, the device first compares the costs of the paths. If the costs are the same, the device will select the path within the non-backbone area with a larger Area ID.
If there are two paths from a device to an ASBR, of which one is an inter-area path that passes through the backbone area, and the other is a path within a non-backbone area, the device first compares the costs of the paths. If the costs of the paths are the same, the device will select the path that passes through the area with a larger Area ID. (The ID of the backbone area is 0, and therefore the inter-area path that passes through the backbone area will not be preferred.)
By default, a device support the route selection rules defined in RFC 1583. (Route selection rules defined in RFC 1583: Route costs are compared first. If route costs are the same, the route that passes through an area with a larger Area ID is selected.)

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