This question actually started with the following in RFC9136:
BD: Broadcast Domain. As per [RFC7432], an EVI consists of a
single BD or multiple BDs. In case of VLAN-bundle and
VLAN-based service models (see [RFC7432]), a BD is
equivalent to an EVI. In case of a VLAN-aware bundle
service model, an EVI contains multiple BDs. Also, in this
document, "BD" and "subnet" are equivalent terms.
It says that in the case of vlan-bundle model, a BD is equivalent to an EVI,
contradicting to RFC7432.
BTW, in my shepherd review of rfc7432bis, I pointed out that I always struggle
with the term "service interface" (vlan-based, vlan-bundle, vlan-aware, etc.)
and suggested to use "service model/mode". While writing this email, I noticed
that RFC9136 already uses "service models" and rfc7432bis also uses term "mode"
in section 6.4. I think we should standardize to "model".
Jeffrey
Juniper Business Use Only
-----Original Message-----
From: Jeffrey (Zhaohui) Zhang
Sent: Wednesday, May 28, 2025 10:38 AM
To: 'BESS' <bess@ietf.org>
Subject: How many BDs in a vlan bundle EVI?
Hi,
RFC7432 says a vlan bundle EVI has multiple BDs:
6.2. VLAN Bundle Service Interface
With this service interface, an EVPN instance corresponds to multiple
broadcast domains (e.g., multiple VLANs);
RFC7432bis says the same in 6.2, but then says in 6.4 that it only has one BD:
* In VLAN-bundle mode, which can be considered as analogous to SVL
mode in 802.1Q, there is one BD per EVI and one BT per MAC-VRF
with multiple VIDs representing that BD.
Jeffrey
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