Hi Jeffrey,
Please see my replies inline.
From: Jeffrey (Zhaohui) Zhang <zzhang=40juniper....@dmarc.ietf.org>
Date: Wednesday, May 28, 2025 at 1:45 PM
To: bess@ietf.org <bess@ietf.org>
Subject: [bess] label scheme in EVPN A-D per EVI routes
Hi,
This is another question coming out of the shepherd review of RFC7432bis.
In the following text, what does "disposition" mean exactly? Just "forwarding"?
Ali> It means forwarding in the disposition direction – i.e., from core to
access
Note that the above allows the Ethernet A-D per EVI route to be
advertised with one of the following granularities:
* One Ethernet A-D route per <ESI, Ethernet Tag ID> tuple per
MAC-VRF. This is applicable when the PE uses MPLS-based
disposition with VID translation or may be applicable when the PE
uses MAC-based disposition with VID translation.
Is it that the label alone will identify the outgoing AC w/o a MAC lookup, and
it can also identify bridge table in which a MAC lookup is done?
Ali> That’s correct.
* One Ethernet A-D route for each <ESI> per MAC-VRF (where the
Ethernet Tag ID is set to 0). This is applicable when the PE uses
MAC-based disposition or MPLS-based disposition without VID
translation.
Is it that the VID in the packet plus the label will determine the outgoing AC
or the bridge table in which a MAC lookup is done?
Ali> In case of MAC-based disposition (i.e., using MAC lookup), the received
MPLS label identifies the bridge table, and the MAC lookup is performed there.
In case of MPLS-based disposition, the received MPLS label identifies, egress
port; however, no VID translation can be done for that port. I will change “or”
or “or,” in the above sentence.
Thanks.
Jeffrey
Juniper Business Use Only
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