rfc9714v2.txt   rfc9714.txt 
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As specified in Section 7.1 of [RFC9341], "for security reasons, the As specified in Section 7.1 of [RFC9341], "for security reasons, the
Alternate-Marking Method MUST only be applied to controlled domains." Alternate-Marking Method MUST only be applied to controlled domains."
This requirement applies when the MPLS performance measurement with This requirement applies when the MPLS performance measurement with
Alternate-Marking Method is taken into account, which means the MPLS Alternate-Marking Method is taken into account, which means the MPLS
encapsulation and related procedures defined in this document MUST encapsulation and related procedures defined in this document MUST
only be applied to controlled domains; otherwise, the potential only be applied to controlled domains; otherwise, the potential
attacks discussed in Section 10 of [RFC9341] may be applied to the attacks discussed in Section 10 of [RFC9341] may be applied to the
deployed MPLS networks. deployed MPLS networks.
As specified in Section 3, the value of a FL MUST be unique within As specified in Section 3, the value of an FL MUST be unique within
the administrative domain. In other words, the administrative domain the administrative domain. In other words, the administrative domain
is the scope of an FL. The method for achieving multi-domain is the scope of an FL. The method for achieving multi-domain
performance measurement with the same FL is outside the scope of this performance measurement with the same FL is outside the scope of this
document. The FL MUST NOT be signaled and distributed outside the document. The FL MUST NOT be signaled and distributed outside the
administrative domain. Improper configuration that allows the FL to administrative domain. Improper configuration that allows the FL to
be passed from one administrative domain to another would result in be passed from one administrative domain to another would result in
Flow-ID conflicts. Flow-ID conflicts.
To prevent packets carrying FLs from leaking from one domain to To prevent packets carrying FLs from leaking from one domain to
another, domain boundary nodes MUST deploy policies (e.g., ACL) to another, domain boundary nodes MUST deploy policies (e.g., ACL) to
filter out these packets. Specifically, at the sending edge, the filter out these packets. Specifically, at the sending edge, the
domain boundary node MUST filter out the packets that carry the Flow- domain boundary node MUST filter out the packets that carry the FLI
ID Label Indicator and are sent to other domains. At the receiving and are sent to other domains. At the receiving edge, the domain
edge, the domain boundary node MUST drop the packets that carry the boundary node MUST drop the packets that carry the FLI and are from
Flow-ID Label Indicator and are from other domains. Note that packet other domains. Note that packet leakage is neither breaching privacy
leakage is neither breaching privacy nor a source of DoS. nor a source of DoS.
9. IANA Considerations 9. IANA Considerations
IANA has assigned the following value in the "Extended Special- IANA has assigned the following value in the "Extended Special-
Purpose MPLS Label Values" registry within the "Special-Purpose Purpose MPLS Label Values" registry within the "Special-Purpose
Multiprotocol Label Switching (MPLS) Label Values" registry group: Multiprotocol Label Switching (MPLS) Label Values" registry group:
+=======+===============================+===========+ +=======+===============================+===========+
| Value | Description | Reference | | Value | Description | Reference |
+=======+===============================+===========+ +=======+===============================+===========+
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