Hi,
Very solid and understandable. Couple of minor comments [NM]:Section 2.1: Layer-2 devices are particularly susceptible to forwarding loops because of the broadcast nature of the Ethernet traffic.
[NM]: better to refer to "Layer-2 services" instead of "Layer-2 devices" as the CE or PE devices themselves may be layer-3 capable.
Section 4.2: Note that while the DF election algorithm in [RFC7432] uses PE address and vlan as inputs, this document uses Ethernet Tag, PE address and ESI as inputs.
[NM]: I think the text in this context uses "vlan" and "Ethernet Tag" interchangeably. Since the above is trying to emphasize the use of "ESI" in this document as the key differentiation, clearer to have other two variables (vlan and PE address) read the same, or else it makes you wonder if there is a difference between vlan and ethernet tag in this context.
Thanks,NeerajOn Tue, Dec 4, 2018 at 4:59 PM The IESG <iesg-secretary@xxxxxxxx> wrote:
The IESG has received a request from the BGP Enabled ServiceS WG (bess) to
consider the following document: - 'Framework for EVPN Designated Forwarder
Election Extensibility'
<draft-ietf-bess-evpn-df-election-framework-06.txt> as Proposed Standard
The IESG plans to make a decision in the next few weeks, and solicits final
comments on this action. Please send substantive comments to the
ietf@xxxxxxxx mailing lists by 2018-12-18. Exceptionally, comments may be
sent to iesg@xxxxxxxx instead. In either case, please retain the beginning of
the Subject line to allow automated sorting.
Abstract
The Designated Forwarder (DF) in EVPN networks is the Provider Edge
(PE) router responsible for sending broadcast, unknown unicast and
multicast (BUM) traffic to a multi-homed Customer Equipment (CE)
device, on a given VLAN on a particular Ethernet Segment (ES). The DF
is selected out of a list of candidate PEs that advertise the same
Ethernet Segment Identifier (ESI) to the EVPN network. By default,
EVPN uses a DF Election algorithm referred to as "Service Carving"
and it is based on a modulus function (V mod N) that takes the number
of PEs in the ES (N) and the VLAN value (V) as input. This default DF
Election algorithm has some inefficiencies that this document
addresses by defining a new DF Election algorithm and a capability to
influence the DF Election result for a VLAN, depending on the state
of the associated Attachment Circuit (AC). In addition, this document
creates a registry with IANA, for future DF Election Algorithms and
Capabilities. It also presents a formal definition and clarification
of the DF Election Finite State Machine.
The file can be obtained via
https://datatracker.ietf..org/doc/draft-ietf-bess-evpn-df-election-framework/
IESG discussion can be tracked via
https://datatracker.ietf.org/doc/draft-ietf-bess-evpn-df-election-framework/ballot/
No IPR declarations have been submitted directly on this I-D.
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