[Last-Call] FW: Re: Last Call: <draft-ietf-bess-evpn-virtual-eth-segment-08.txt> (EVPN Virtual Ethernet Segment) to Proposed Standard

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Resending with the correct address

 

Regards,

Sasha

 

From: Alexander Vainshtein
Sent: Sunday, April 16, 2023 6:44 PM
To: last-calls@xxxxxxxx; draft-ietf-bess-evpn-virtual-eth-segment@xxxxxxxx
Cc: GTD-SYS-Packet Solutions <GTD-SYS-Packet-Solutions@xxxxxxxx>; bess@xxxxxxxx
Subject: Re: Last Call: <draft-ietf-bess-evpn-virtual-eth-segment-08.txt> (EVPN Virtual Ethernet Segment) to Proposed Standard

 

Hi all,

I have doubts regarding the text in Section 1.2 of the draft that refers to LSPs (as opposed to PWs) as virtual Ethernet Segments.

 

The problematic (from my POV) text refers to Figure 2 and says (the problematic part is highlighted):

 

 

   In such scenarios, a virtual ES (vES) is defined as a set of

   individual PWs if they cannot be aggregated into a common LSP.  If

   the aggregation of PWs is possible, the vES can be associated to an

   LSP in a given PE.  In the example of Figure 2, EVC3 is connected to

   a VPWS instance in AG2 that is connected to PE1 and PE2 via PW3 and

   PW5 respectively.  EVC4 is connected to a separate VPWS instance on

   AG2 that gets connected to an EVI on PE1 and PE2 via PW4 and PW6,

   respectively.  Since the PWs for the two VPWS instances can be

   aggregated into the same LSPs going to the MPLS network, a common

   virtual ES can be defined for LSP1 and LSP2.  This vES will be shared

   by two separate EVIs in the EVPN network.

 

 

The problem with the highlighted text is that PE1 and PE2 always can identify the PW from which they receive this or that packet, but, in most cases, cannot identify the LSP in which this PW has been running.

(The only exception of which I am aware, is the case of static PWEs in bi-directional MPLS-TP LSPs).

If LSP1 and LSP2 were components of a common virtual MH ES,  PE1, upon reception of a BUM packet from PW4, would not be able to identify this MH ES and to insert a suitable ESI label into the EVPN encapsulation of the copy it would be sending to PE2.

 

IMHO and FWIW some clarification (e.g., restricting ability to use LSPs as virtual Ethernet Segments to just bi-directional MPLS-TP LSPs?) would be very much in place.

 

Hopefully these notes will be useful.

 

Regards,

Sasha

 


The IESG has received a request from the BGP Enabled ServiceS WG (bess) to consider the following document: - 'EVPN Virtual Ethernet Segment'

  <draft-ietf-bess-evpn-virtual-eth-segment-08.txt> as Proposed Standard

 

The IESG plans to make a decision in the next few weeks, and solicits final comments on this action. Please send substantive comments to the last-call@xxxxxxxx mailing lists by 2023-04-27. Exceptionally, comments may be sent to iesg@xxxxxxxx instead. In either case, please retain the beginning of the Subject line to allow automated sorting.

 

Abstract

 

 

   EVPN and PBB-EVPN introduce a family of solutions for multipoint

   Ethernet services over MPLS/IP network with many advanced features

   among which their multi-homing capabilities.  These solutions

   introduce Single-Active and All-Active for an Ethernet Segment (ES),

   itself defined as a set of physical links between the multi-homed

   device/network and a set of PE devices that they are connected to.

   This document extends the Ethernet Segment concept so that an ES can

   be associated to a set of EVCs (e.g., VLANs) or other objects such as

   MPLS Label Switch Paths (LSPs) or Pseudowires (PWs), referred to as

   Virtual Ethernet Segments (vES).  This draft describes the

   requirements and the extensions needed to support vES in EVPN and

   PBB-EVPN.

 

 

 

 

 

The file can be obtained via

https://clicktime.symantec.com/15sLvSMFe6yJaL7it9kEb?h=WX7sPrWtPYj6YArP1_IG-VUvi72ntJf3jPZD8aotZlk=&u=https://clicktime.symantec.com/15siFA9u7fT6Pcy1rRzYE?h=oH6e_3PB3X1eWGKah_83SV7rAO13MiTubvXyMPWLSs4=&u=https://datatracker.ietf.org/doc/draft-ietf-bess-evpn-virtual-eth-segment/

 

 

The following IPR Declarations may be related to this I-D:

 

   https://clicktime.symantec.com/15sM1GYY6ietzGweRi9PD?h=LatO2AZiVAH39lrwHIwya5amzj8HrV_kDAIVEAeg85M=&u=https://clicktime.symantec.com/15siKzMBaH8goZnwPzPgr?h=2sUb0zrdQ5wcPvhgS2fD7IYQBGY3koDFG7wzpwkjYlU=&u=https://datatracker.ietf.org/ipr/3169/

   https://clicktime.symantec.com/15sMAvw71x25pAbVWpwgT?h=GdR-katv1Fmx1tCzKJUyhSBiuWnAI85UP95ltcuRR_U=&u=https://clicktime.symantec.com/15siVejkVWVsdTSnV7Bz6?h=sT7aE2ZEJl5mDkO4HW9iizdbIbzENVSMXvgn_zrG5lg=&u=https://datatracker.ietf.org/ipr/3354/

   https://clicktime.symantec.com/15sM66jpZLLVQDmZyGYXq?h=Hr8E955Kl0orr2_O8JUL1JHDwJMJS1wH8Q2F_JhQIrM=&u=https://clicktime.symantec.com/15siQpYU2tpHDWcrwYnqU?h=vhhGcaEYULDbhQhTesln7lZn7Qj-ZfAKgO-VH6KAeCU=&u=https://datatracker.ietf.org/ipr/3353/

 

 

 

 

 

Regards,

Sasha

 


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