Hi all,
I have a couple of questions about usage of EVPN Type 5 routes (a.k.a. RT-5) in
the Interface-less IP-VRF-to-IP-VRF model described in Section 4.4.1 of RFC
9136<https://datatracker.ietf.org/doc/html/rfc9136#section-4.4.1>.
I am copying the diagram shown in Figure 8 in this section for convenience.
NVE1(M1)
+------------+
IP1+----| (BD-1) | DGW1(M3)
| \ | +---------+ +--------+
| (IP-VRF)|----| |-|(IP-VRF)|----+
| / | | | +--------+ |
+---| (BD-2) | | | _+_
| +------------+ | | ( )
SN1| | VXLAN/ | ( WAN )--H1
| NVE2(M2) | GENEVE/| (___)
| +------------+ | MPLS | +
+---| (BD-2) | | | DGW2(M4) |
| \ | | | +--------+ |
| (IP-VRF)|----| |-|(IP-VRF)|----+
| / | +---------+ +--------+
SN2+----| (BD-3) |
+------------+
As you can see, this model does not show any Broadcast Domains (BD) or IRB
interfaces in IP-VRFs residing in DGW1/DGW2.
The text that follows the diagram explains how prefixes representing SN1 and
SN2 are advertised by NVE1 and NVE2 as RT-5 and accepted by IP-VRFs in DGW1 and
DGW2.
Therefore, traffic generated by H1 can reach the destinations in subnets SN1
and SN2.
1. Do I understand correctly that IP-VRFs in DGW1/DGW2 advertise RT-5 to
some destination that cover H1? If yes are the RDs in the NLRI of these routes
are the RDs of the advertising IP-VRFs?
2. Suppose that some hosts (say, H11 and H22) are locally connected to the
IP-VRF in DGW1 and DGW2 respectively - without any BDs and IRB interfaces in
these devices as shown below. Will DGW1 and DGW2 advertise RT-5 that cover
these destinations?
H11
NVE1(M1) +
+------------+ |
IP1+----| (BD-1) | DGW1(M3)|
| \ | +---------+ +--------+
| (IP-VRF)|----| |-|(IP-VRF)|----+
| / | | | +--------+ |
+---| (BD-2) | | | _+_
| +------------+ | | ( )
SN1| | VXLAN/ | ( WAN )--H1
| NVE2(M2) | GENEVE/| (___)
| +------------+ | MPLS | +
+---| (BD-2) | | | DGW2(M4) |
| \ | | | +--------+ |
| (IP-VRF)|----| |-|(IP-VRF)|----+
| / | +---------+ +--------+
SN2+----| (BD-3) | |
+------------+ |
+
H22
Your timely feedback will be highly appreciated.
Regards, and lots of thanks in advance,
Sasha
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