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        RFC 8361

        Title:      Transparent Interconnection of Lots of 
                    Links (TRILL): Centralized Replication for Active-Active 
                    Broadcast, Unknown Unicast, and Multicast (BUM) 
        Author:     W. Hao,
                    Y. Li,
                    M. Durrani,
                    S. Gupta,
                    A. Qu
        Status:     Standards Track
        Stream:     IETF
        Date:       April 2018
        Mailbox:    haowei...@huawei.com, 
        Pages:      17
        Characters: 40095
        Updates:    RFC 6325

        I-D Tag:    draft-ietf-trill-centralized-replication-13.txt

        URL:        https://www.rfc-editor.org/info/rfc8361

        DOI:        10.17487/RFC8361

In Transparent Interconnection of Lots of Links (TRILL) active-active
access, a Reverse Path Forwarding (RPF) check failure issue may occur
when using the pseudo-nickname mechanism specified in RFC 7781.  This
document describes a solution to resolve this RPF check failure issue
through centralized replication.  All ingress Routing Bridges
(RBridges) send Broadcast, Unknown Unicast, and Multicast (BUM)
traffic to a centralized node with unicast TRILL encapsulation.  When
the centralized node receives the BUM traffic, it decapsulates the
packets and forwards them to their destination RBridges using a
distribution tree established per the TRILL base protocol (RFC 6325).
To avoid RPF check failure on an RBridge sitting between the ingress
RBridge and the centralized replication node, some change in the RPF
calculation algorithm is required.  RPF checks on each RBridge MUST
be calculated as if the centralized node was the ingress RBridge,
instead of being calculated using the actual ingress RBridge.  This
document updates RFC 6325.

This document is a product of the Transparent Interconnection of Lots of Links 
Working Group of the IETF.

This is now a Proposed Standard.

STANDARDS TRACK: This document specifies an Internet Standards Track
protocol for the Internet community, and requests discussion and suggestions
for improvements.  Please refer to the current edition of the Official
Internet Protocol Standards (https://www.rfc-editor.org/standards) for the 
standardization state and status of this protocol.  Distribution of this 
memo is unlimited.

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