< draft-ietf-rtgwg-policy-model-23.txt		draft-ietf-rtgwg-policy-model-24.txt >
	skipping to change at page 1, line 14 ¶		skipping to change at page 1, line 14 ¶
	Internet-Draft Futurewei		Internet-Draft Futurewei
	Intended status: Standards Track J. Tantsura		Intended status: Standards Track J. Tantsura
	Expires: March 20, 2021 Apstra		Expires: March 20, 2021 Apstra
	A. Lindem		A. Lindem
	Cisco		Cisco
	X. Liu		X. Liu
	Volta Networks		Volta Networks
	September 16, 2020		September 16, 2020
	A YANG Data Model for Routing Policy Management		A YANG Data Model for Routing Policy Management
	draft-ietf-rtgwg-policy-model-23		draft-ietf-rtgwg-policy-model-24
	Abstract		Abstract
	This document defines a YANG data model for configuring and managing		This document defines a YANG data model for configuring and managing
	routing policies in a vendor-neutral way and based on actual		routing policies in a vendor-neutral way and based on actual
	operational practice. The model provides a generic policy framework		operational practice. The model provides a generic policy framework
	which can be augmented with protocol-specific policy configuration.		which can be augmented with protocol-specific policy configuration.
	Status of This Memo		Status of This Memo
	skipping to change at page 9, line 39 ¶		skipping to change at page 9, line 39 ¶
	conditions and actions before returning to the calling policy		conditions and actions before returning to the calling policy
	statement and resuming evaluation. The outcome of the called policy		statement and resuming evaluation. The outcome of the called policy
	affects the evaluation of the calling policy. If the called policy		affects the evaluation of the calling policy. If the called policy
	results in an accept-route, then the subroutine returns an effective		results in an accept-route, then the subroutine returns an effective
	boolean true value to the calling policy. For the calling policy,		boolean true value to the calling policy. For the calling policy,
	this is equivalent to a condition statement evaluating to a true		this is equivalent to a condition statement evaluating to a true
	value and evaluation of the policy continues (see Section 5). Note		value and evaluation of the policy continues (see Section 5). Note
	that the called policy may also modify attributes of the route in its		that the called policy may also modify attributes of the route in its
	action statements. Similarly, a reject-route action returns false		action statements. Similarly, a reject-route action returns false
	and the calling policy evaluation will be affected accordingly. When		and the calling policy evaluation will be affected accordingly. When
	the end of the subroutine policy statements is reached, is reached,		the end of the subroutine policy statements is reached, the default
	the default route disposition action is returned (i.e., boolean false		route disposition action is returned (i.e., boolean false for reject-
	for reject-route). Consequently, a subroutine cannot explicitly		route). Consequently, a subroutine cannot explicitly accept or
	accept or reject a route. Rather it merely provides an indication		reject a route. Rather it merely provides an indication that 'call-
	that 'call-policy' condition returns boolean true or false indicating		policy' condition returns boolean true or false indicating whether or
	whether or not the condition matches. Route acceptance or rejection		not the condition matches. Route acceptance or rejection is solely
	is solely determined by the top-level policy.		determined by the top-level policy.
	Note that the called policy may itself call other policies (subject		Note that the called policy may itself call other policies (subject
	to implementation limitations). The model does not prescribe a		to implementation limitations). The model does not prescribe a
	nesting depth because this varies among implementations. For		nesting depth because this varies among implementations. For
	example, some major implementation may only support a single level of		example, some major implementation may only support a single level of
	subroutine recursion. As with any routing policy construction, care		subroutine recursion. As with any routing policy construction, care
	must be taken with nested policies to ensure that the effective		must be taken with nested policies to ensure that the effective
	return value results in the intended behavior. Nested policies are a		return value results in the intended behavior. Nested policies are a
	convenience in many routing policy constructions but creating		convenience in many routing policy constructions but creating
	policies nested beyond a small number of levels (e.g., 2-3) are		policies nested beyond a small number of levels (e.g., 2-3) are
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