Hi, I would like to present what looks to me as yet another minor inconsistency in the rfc7432bis draft.<https://datatracker.ietf.org/doc/html/draft-ietf-bess-rfc7432bis-10>
Section 9.2.1 lists four possible methods for allocating the label that is carried in the Label1 field of the NLRI of MAC/IP Advertisement (EVPN Type 2) routes as shown below: * A PE may advertise the same single EVPN label for all MAC addresses in a given MAC-VRF. This label assignment is referred to as a per MAC-VRF label assignment.¶<https://datatracker.ietf.org/doc/html/draft-ietf-bess-rfc7432bis-10#section-9.2.1-9.1> * Alternatively, a PE may advertise a unique EVPN label per <MAC-VRF, Ethernet tag> combination. This label assignment is referred to as a per <MAC-VRF, Ethernet tag> label assignment.¶<https://datatracker.ietf.org/doc/html/draft-ietf-bess-rfc7432bis-10#section-9.2.1-9.2> * As a third option, a PE may advertise a unique EVPN label per <ESI, Ethernet tag> combination. This label assignment is referred to as a per <ESI, Ethernet tag> label assignment.¶<https://datatracker.ietf.org/doc/html/draft-ietf-bess-rfc7432bis-10#section-9.2.1-9.3> * As a fourth option, a PE may advertise a unique EVPN label per MAC address. This label assignment is referred to as a per MAC label assignment.¶<https://datatracker.ietf.org/doc/html/draft-ietf-bess-rfc7432bis-10#section-9.2.1-9.4> However, an EVI that implements VLAN-aware bundle service interface as defined in Section 6.3 of the draft, the same MAC address may be locally learned in different BDs (identified by their Ethernet Tag IDs) in the same MAC-VRF. To me this suggests that there is (at least in theory) there is the fifth option, in which a unique EVPN label would be allocated per <MAC-VRF, locally learned MAC address, Ethernet Tag ID> combination. Hopefully this note will be useful. Regards, Sasha Disclaimer This e-mail together with any attachments may contain information of Ribbon Communications Inc. and its Affiliates that is confidential and/or proprietary for the sole use of the intended recipient. Any review, disclosure, reliance or distribution by others or forwarding without express permission is strictly prohibited. If you are not the intended recipient, please notify the sender immediately and then delete all copies, including any attachments.
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