Hi,
For the Ethernet Tag ID in the type-5 routes, RFC 9136 gives two examples of
Tag ID 0 and mentions the following:
* The Route Distinguisher (RD) and Ethernet Tag ID MUST be used as
defined in [RFC7432] and [RFC8365].
Obviously, RFC7432/8365 won't have text about the tag used in EVPN type-5
routes, so I have the following assumptions:
A particular tenant has one IP VRF and one or more EVIs (Mac VRFs) on a PE. In
the case of vlan-aware bundle EVI, the Ethernet tag ID identifies a BD, and the
mac address in a particular BD can be used as the overlay index for a type-5
route. In this case, the tag id in the type-5 route will be set to the ethernet
tag ID that identifies the BD.
This also assumes that the type-5 routes (with non-zero tag) are tied to one
(of all) vlan-aware EVI, or there are some other means of identifying which
vlan-aware EVI will be used together with the ethernet tag ID in the type-5
routes.
In particular, a non-zero ethernet tag id will only be used in type-5 routes in
the vlan-aware model when the overlay index is a MAC address in a particular BD.
Is my understanding correct?
Thanks.
Jeffrey
Juniper Business Use Only
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