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Re: [bess] Query/comments on draft-ietf-bess-evpn-lsp-ping-05

"Dikshit, Saumya" <saumya.dikshit@hpe.com> Tue, 07 September 2021 15:49 UTC

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From: "Dikshit, Saumya" <saumya.dikshit@hpe.com>
To: "draft-ietf-bess-evpn-lsp-ping@ietf.org" <draft-ietf-bess-evpn-lsp-ping@ietf.org>, "bess@ietf.org" <bess@ietf.org>
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Thread-Topic: Query/comments on draft-ietf-bess-evpn-lsp-ping-05
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Subject: Re: [bess] Query/comments on draft-ietf-bess-evpn-lsp-ping-05
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Hello Authors of draft-ietf-bess-evpn-lsp-ping draft,

Please help me with below.
Apology, if these queries have come in too late in the cycle.

Thanks
Saumya.

From: Dikshit, Saumya
Sent: Thursday, September 2, 2021 11:12 PM
To: draft-ietf-bess-evpn-lsp-ping@ietf.org; bess@ietf.org
Cc: bess-chairs@ietf.org
Subject: Query/comments on draft-ietf-bess-evpn-lsp-ping-05

[sending the queries in a different email with changed subject line]

Hello Authors of draft-ietf-bess-evpn-lsp-ping draft,

I have following queries regarding this draft:

>>>> Do we intend-to-use/call-out-usage-of "wild-card/don't-care" values for attributes carried in the sub-TLVs ?
For example, If the admin intends  to check the reachability to host (MAC_X/IP_X) published (in route-type-2)  by remote PE.
The remote PE learnt it locally over ESI_X against Vlan X (mapped to BD_XYZ).

Is it possible, that the "EVPN MAC sub-tlv"  can carry the "Route Distinguisher" and "Ethernet Segment Identifier" as don't care.

>>>> Another caseto handle would be test the reachability to tenant-VRF VRF_X (with EVPN mapped EVI) configured on the remote PE, PE1.
VRF_X has no active IP/IPv6 interface configured and its sole usage is to obtain the leaked (via IVRL) routes from other VRFs (non-EVPN) and PE1 published this to other peers via EVPN control plane. Till the first prefix (learnt ) route is published (Route Type 5) by PE1 for the EVI (mapped to VRF_X), the tunnels will not be provisioned on other PEs.
In order to test the reachability to VRF_X (on PE1) from another PEs, let's say, PE2 or a centralized-controller (which can emulate/supports MPLS),

It may need to carry all/subset-of attributes with "don't-care/wild-card" in "EVPN IP Prefix Sub-TLV".


Please let know your thoughts on above.

Thanks
Saumya.

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