RFC 9135, "Integrated Routing and Bridging in Ethernet VPN (EVPN)", October 2021

Errata ID: 7683
Status: Verified
Type: Technical
Publication Format(s) : TEXT, PDF, HTML
Reported By: Denis Vrkic
Date Reported: 2023-10-19
Verifier Name: John Scudder
Date Verified: 2024-02-09

Section 4.2. says:

  2.  However, if PE2 is configured for asymmetric IRB mode, PE2 will
       advertise TS4 MAC/IP information in a MAC/IP Advertisement route
       with a zero Label2 field and no Route Target identifying IP-VRF1.
       In this case, PE2 will install TS4 information in its ARP table
       and BT1.  When a packet from TS2 to TS4 arrives at PE1, a longest
       prefix match on IP-VRF1's route table will yield the local IRB
       interface to BT1, where a subsequent ARP and bridge table lookup
       will provide the information for an asymmetric forwarding mode to
       PE2.

It should say:

  2.  However, if PE2 is configured for asymmetric IRB mode, PE2 will
       advertise TS4 MAC/IP information in a MAC/IP Advertisement route
       with a zero Label2 field and no Route Target identifying IP-VRF1.
       In this case, PE1 will install TS4 information in its ARP table
       and BT1.  When a packet from TS2 to TS4 arrives at PE1, a longest
       prefix match on IP-VRF1's route table will yield the local IRB
       interface to BT1, where a subsequent ARP and bridge table lookup
       will provide the information for an asymmetric forwarding mode to
       PE2.

Notes:

PE1 will use ARP table for forwarding traffic to PE2 - seems like typo

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