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
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sent to i...@ietf.org instead. In either case, please retain the beginning of
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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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