Re: [bess] All-Active Multi-homing and Virtual Ethernet Segments: A Question
"Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com> Thu, 27 September 2018 16:11 UTC
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From: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com>
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>, "Luc Andre Burdet (lburdet)" <lburdet@cisco.com>, "Ali Sajassi (sajassi)" <sajassi@cisco.com>
CC: Michael Gorokhovsky <Michael.Gorokhovsky@ecitele.com>, Alexander Ferdman <Alexander.Ferdman@ecitele.com>, Shell Nakash <Shell.Nakash@ecitele.com>, "bess@ietf.org" <bess@ietf.org>, "draft-sajassi-bess-evpn-virtual-eth-segment.authors@ietf.org" <draft-sajassi-bess-evpn-virtual-eth-segment.authors@ietf.org>, "pals@ietf.org" <pals@ietf.org>
Thread-Topic: [bess] All-Active Multi-homing and Virtual Ethernet Segments: A Question
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Subject: Re: [bess] All-Active Multi-homing and Virtual Ethernet Segments: A Question
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Sasha, Although I agree with Luc and Ali that an all-active solution can be added to the description, note that, in the current text, there is nothing (I think) that implies that you can use all-active mode with an ES that is associated to PWs. So unless we add that description for all-active, people should assume PW-based ES’es support only single-active mode. My 2 cents. Jorge From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com> Date: Wednesday, September 26, 2018 at 10:58 AM To: "Luc Andre Burdet (lburdet)" <lburdet@cisco.com>, "Ali Sajassi (sajassi)" <sajassi@cisco.com> Cc: Michael Gorokhovsky <Michael.Gorokhovsky@ecitele.com>, Alexander Ferdman <Alexander.Ferdman@ecitele.com>, Shell Nakash <Shell.Nakash@ecitele.com>, "bess@ietf.org" <bess@ietf.org>, "draft-sajassi-bess-evpn-virtual-eth-segment.authors@ietf.org" <draft-sajassi-bess-evpn-virtual-eth-segment.authors@ietf.org>, "pals@ietf.org" <pals@ietf.org> Subject: Re: [bess] All-Active Multi-homing and Virtual Ethernet Segments: A Question Resent-From: <alias-bounces@ietf.org> Resent-To: <sajassi@cisco.com>, <pbrisset@cisco.com>, <richard.schell@verizon.com>, <jdrake@juniper.net>, Jorge Rabadan <jorge.rabadan@alcatel-lucent.com> Resent-Date: Wednesday, September 26, 2018 at 10:58 AM Ali, Lots of thanks for a prompt response. I fully understand how the scheme described by Luc could work. But I have some doubts regarding it matching the standard PW architecture. First of all, tbis scheme mandates usage of static PW labels - I do not think this is common, not even with MPLS-TP (where, at least nominally, you could still advertise PW labels using targeted LDP session between the pair of PEs). There are some generic PW mechanisms that cannot be used (e.g., sequencing). This may be a minor issue because "fat PWs" (RFC 6391) also do not allow sequencing. And there may be more - e.g., I doubt you could use static PW status messages (RFC 6478) with this construct... So I think that asking the PALS WG (that, from my POV, is the body that has the authority to decide what is and what is not a PW) position on this construct makes sense. Thumb typed by Sasha Vainshtein ________________________________ From: Ali Sajassi (sajassi) <sajassi@cisco.com> Sent: Tuesday, September 25, 2018 7:07:00 PM To: Alexander Vainshtein; Luc Andre Burdet (lburdet) Cc: Michael Gorokhovsky; Alexander Ferdman; Shell Nakash; bess@ietf.org; draft-sajassi-bess-evpn-virtual-eth-segment.authors@ietf.org; pals@ietf.org Subject: Re: [bess] All-Active Multi-homing and Virtual Ethernet Segments: A Question Hi Sasha, What Luc mentioned below can work with any of the existing model supporting static PW because the pair of EVPN PEs terminating vES (with PW termination) act and look like a single logical PE to the CE. Therefore, the CE sees its PW being terminated by a single logical PE. EVPN provides the synch mechanism between the pair of PEs running vES. I agree with Luc that an example can be provided in the draft to describe how All-Active vES can be supported with PWs. Cheers, Ali From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com> Date: Tuesday, September 25, 2018 at 8:09 AM To: "Luc Andre Burdet (lburdet)" <lburdet@cisco.com> Cc: Michael Gorokhovsky <Michael.Gorokhovsky@ecitele.com>, Alexander Ferdman <Alexander.Ferdman@ecitele.com>, Shell Nakash <Shell.Nakash@ecitele.com>, "bess@ietf.org" <bess@ietf.org>, "draft-sajassi-bess-evpn-virtual-eth-segment.authors@ietf.org" <draft-sajassi-bess-evpn-virtual-eth-segment.authors@ietf.org>, "pals@ietf.org" <pals@ietf.org> Subject: RE: [bess] All-Active Multi-homing and Virtual Ethernet Segments: A Question Resent-From: <alias-bounces@ietf.org> Resent-To: Cisco Employee <sajassi@cisco.com>, <pbrisset@cisco.com>, <richard.schell@verizon.com>, <jdrake@juniper.net>, <jorge.rabadan@alcatel-lucent.com> Resent-Date: Tuesday, September 25, 2018 at 8:09 AM Luc, Lots of thanks for a prompt and highly informative response. I am adding the PALS WG to the CC list since, from my POV, your proposal goes beyond the PW network reference model as shown in Figure 2 of RFC 3985<https://tools.ietf.org/html/rfc3985>. While this model has been extended to cover multi-segment PWs (RFC 6073<https://tools.ietf.org/html/rfc6073>) PW redundancy (RFC 6718<https://tools.ietf.org/html/rfc6718>) and ICCP (RFC 7275<https://tools.ietf.org/html/rfc7275>) none of these extensions seem to be directly applicable to the proposed scheme. My 2c, Sasha Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@ecitele.com From: Luc Andre Burdet (lburdet) [mailto:lburdet@cisco.com] Sent: Tuesday, September 25, 2018 5:46 PM To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>; draft-sajassi-bess-evpn-virtual-eth-segment.authors@ietf.org Cc: Michael Gorokhovsky <Michael.Gorokhovsky@ecitele.com>; Alexander Ferdman <Alexander.Ferdman@ecitele.com>; Shell Nakash <Shell.Nakash@ecitele.com>; bess@ietf.org Subject: Re: [bess] All-Active Multi-homing and Virtual Ethernet Segments: A Question Hi Sasha, I agree the vES draft does not go in great detail about A/A PWs. For A/A PWs terminating at peering PEs, the concept is similar to LAG, using static label at peering PEs: · The CE sets up a single PW to remote endpoint to anycast IP1, Label1. · PE1, PE2 set up a PW each to CE, using local static label Label1. · PE1,PE2 adv IP1 as anycast IP towards CE-side There will not be excessive MAC-moves since the CE sees only one pseudowire to a single remote—very similar to what is done for LAG on “real” links. We can update the draft to be more descriptive—that draft needs a re-read anyways, the header on each page still reads “PBB-EVPN” ☺ HTH, Luc André [http://www.cisco.com/c/dam/m/en_us/signaturetool/images/banners/standard/09_standard_graphic.png] Luc André Burdet lburdet@cisco.com<mailto:lburdet@cisco.com> Tel: +1 613 254 4814 Cisco Systems Canada Co. / Les Systemes Cisco Canada CIE Cisco.com<http://www.cisco.com/web/CA/> From: BESS <bess-bounces@ietf.org<mailto:bess-bounces@ietf.org>> on behalf of Alexander Vainshtein <Alexander.Vainshtein@ecitele.com<mailto:Alexander.Vainshtein@ecitele.com>> Date: Tuesday, September 25, 2018 at 06:25 To: "draft-sajassi-bess-evpn-virtual-eth-segment.authors@ietf.org<mailto:draft-sajassi-bess-evpn-virtual-eth-segment.authors@ietf.org>" <draft-sajassi-bess-evpn-virtual-eth-segment.authors@ietf.org<mailto:draft-sajassi-bess-evpn-virtual-eth-segment.authors@ietf.org>> Cc: Michael Gorokhovsky <Michael.Gorokhovsky@ecitele.com<mailto:Michael.Gorokhovsky@ecitele.com>>, Alexander Ferdman <Alexander.Ferdman@ecitele.com<mailto:Alexander.Ferdman@ecitele.com>>, Shell Nakash <Shell.Nakash@ecitele.com<mailto:Shell.Nakash@ecitele.com>>, "bess@ietf.org<mailto:bess@ietf.org>" <bess@ietf.org<mailto:bess@ietf.org>> Subject: [bess] All-Active Multi-homing and Virtual Ethernet Segments: A Question Dear authors of the EVPN Virtual Ethernet Segment<https://tools.ietf.org/html/draft-sajassi-bess-evpn-virtual-eth-segment-03> draft, My colleagues and I have a question pertaining to support of All-Active redundancy mode in EVPN that uses virtual Ethernet Segments. Section 8.5 of RFC 7432<https://tools.ietf.org/html/rfc7432#section-8.5> says: If a bridged network is multihomed to more than one PE in an EVPN network via switches, then the support of All-Active redundancy mode requires the bridged network to be connected to two or more PEs using a LAG. If a bridged network does not connect to the PEs using a LAG, then only one of the links between the bridged network and the PEs must be the active link for a given <ES, VLAN> or <ES, VLAN bundle>. In this case, the set of Ethernet A-D per ES routes advertised by each PE MUST have the "Single-Active" bit in the flags of the ESI Label extended community set to 1. This restriction is easy to understand, since, with the All-Active multi-homing mode of an Ethernet Segment, a CE attached to such a segment potentially would receive traffic from all the PEs attached to this segment. Since A CE that is part of a bridged network must learn MAC addresses of the received traffic, it would potentially experience continuous MAC Move events – with undesirable consequences. The EVPN Virtual Ethernet Segment draft replaces Ethernet links (forming a “real” ES) with Ethernet PWs, and claims support of both Single-homed and multi-homed multi-homing modes. When I compare these claims with the quoted above statement from RFC 7432, I see two possibilities: · Either a CE that is connected to an All-Active vES cannot be part of a bridged network (and thus would not do any MAC learning) · Or an extension of LAG that deals with Ethernet PWs instead of Ethernet links is required. Could you please clarify which of these two options is correct? Note: The draft includes Informative references to the two drafts that have been published as RFC 7432 and RFC 7623. Regards, Sasha Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@ecitele.com<mailto:Alexander.Vainshtein@ecitele.com> ___________________________________________________________________________ This e-mail message is intended for the recipient only and contains information which is CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have received this transmission in error, please inform us by e-mail, phone or fax, and then delete the original and all copies thereof. ___________________________________________________________________________ ___________________________________________________________________________ This e-mail message is intended for the recipient only and contains information which is CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have received this transmission in error, please inform us by e-mail, phone or fax, and then delete the original and all copies thereof. ___________________________________________________________________________ ___________________________________________________________________________ This e-mail message is intended for the recipient only and contains information which is CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have received this transmission in error, please inform us by e-mail, phone or fax, and then delete the original and all copies thereof. ___________________________________________________________________________
- [bess] All-Active Multi-homing and Virtual Ethern… Alexander Vainshtein
- Re: [bess] All-Active Multi-homing and Virtual Et… Luc Andre Burdet (lburdet)
- Re: [bess] All-Active Multi-homing and Virtual Et… Alexander Vainshtein
- Re: [bess] All-Active Multi-homing and Virtual Et… Ali Sajassi (sajassi)
- Re: [bess] All-Active Multi-homing and Virtual Et… Alexander Vainshtein
- Re: [bess] All-Active Multi-homing and Virtual Et… Rabadan, Jorge (Nokia - US/Mountain View)
- Re: [bess] All-Active Multi-homing and Virtual Et… Alexander Vainshtein
- Re: [bess] All-Active Multi-homing and Virtual Et… Rabadan, Jorge (Nokia - US/Mountain View)
- Re: [bess] All-Active Multi-homing and Virtual Et… Alexander Vainshtein
- Re: [bess] All-Active Multi-homing and Virtual Et… Rabadan, Jorge (Nokia - US/Mountain View)
- Re: [bess] All-Active Multi-homing and Virtual Et… Alexander Vainshtein