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boundary="_000_SJ0PR11MB57704522C59297454CB1971CB0069SJ0PR11MB5770namp_" MIME-Version: 1.0 X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: SJ0PR11MB5770.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 051f3a88-df6e-42bc-e540-08dac8b34dc5 X-MS-Exchange-CrossTenant-originalarrivaltime: 17 Nov 2022 15:49:25.5550 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 5ae1af62-9505-4097-a69a-c1553ef7840e X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 4rpZwdPUVMexvWpepFijBtb83YY/XB+o7I1r8eUnL2GHH0pddpJMR+a6ph2YQqxN/hWWGdSsFF2i7dHO/wVCwQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW3PR11MB4667 X-OriginatorOrg: cisco.com X-Outbound-SMTP-Client: 173.37.135.123, xfe-aln-003.cisco.com X-Outbound-Node: alln-core-5.cisco.com Archived-At: Subject: Re: [bess] A doubt about draft-sajassi-bess-evpn-ip-aliasing-05 X-BeenThere: bess@ietf.org X-Mailman-Version: 2.1.39 Precedence: list List-Id: BGP-Enabled ServiceS working group discussion list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 17 Nov 2022 15:49:34 -0000 --_000_SJ0PR11MB57704522C59297454CB1971CB0069SJ0PR11MB5770namp_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Sasha, EVPN based RFCs (7432 and 8365) define two types of multi-homing: All-Activ= e and Single-Active. Both of these multi-homing mechanism relies on multi-h= oming PEs to control loop detection and prevention using DF election and sp= lit-horizon filtering. draft-ietf-bess-evpn-l2gw-proto-02 introduces a 3rd = multi-homing mechanism called Single-Flow-Active for scenarios where loop d= etection and prevention are performed by CE devices (running L2GW protocols= ) and not PEs. draft-sajassi-bess-evpn-ip-aliasing-05 basically extends the baseline mu= lti-homing mechanism of All-Active to L3 use cases mentioned in the draft (= e.g., symmetric IRB). This draft is NOT intended for Single-Flow-Active mul= ti-homing use case. If single-flow-active multi-homing need to get extende= d to L3 use cases, then it can be covered in a follow-up single-flow-active= draft. Cheers, Ali From: Alexander Vainshtein Date: Thursday, November 17, 2022 at 2:25 AM To: draft-sajassi-bess-evpn-ip-aliasing@ietf.org Cc: Luc Andr=E9 Burdet , bess@ietf.org , Nitsan Dolev , Alexander Ferdman , Ron Sdayoor , Dmitry Valdman Subject: A doubt about draft-sajassi-bess-evpn-ip-aliasing-05 Hi, I have doubts regarding applicability of the solution for L3 fast convergen= ce defined in draft-sajassi-bess-evpn-ip-aliasing-05 for the scenarios i= n which the MH ES in question operates in Single Flow-Active load-balancing= mode as described in draft-ietf-bess-evpn-l2gw-proto-02. These doubts are based on the fact that, in Single Flow-Active load-balanci= ng mode, the Primary PE is defined by the Layer 2 Control Protocol (or its = equivalent) for each specific host, while the EVPN IP Aliasing draft advert= ises Primary/Backup paths via P/B bits in the EVPN Layer 2 Extended Communi= ty attached to the IP A-D EVPN routes. What, if anything, did I miss? Your feedback would be highly appreciated. Regards, and lots of thanks in advance, Sasha Notice: This e-mail together with any attachments may contain information o= f Ribbon Communications Inc. and its Affiliates that is confidential and/or= proprietary for the sole use of the intended recipient. Any review, disclo= sure, reliance or distribution by others or forwarding without express perm= ission is strictly prohibited. If you are not the intended recipient, pleas= e notify the sender immediately and then delete all copies, including any a= ttachments. --_000_SJ0PR11MB57704522C59297454CB1971CB0069SJ0PR11MB5770namp_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hi Sasha,

 

EVPN based RFCs (7432 and 8365) define two types of multi-homing: Al= l-Active and Single-Active. Both of these multi-homing mechanism relies on = multi-homing PEs to control loop detection and prevention using DF election and split-horizon filtering.  draft-ietf-bess-evpn-l2gw-proto-02 introduces a 3rd mult= i-homing mechanism called Single-Flow-Active for scenarios where loop detection and prevention are performed by CE devi= ces (running L2GW protocols) and not PEs.

 

draft-sajassi-bess-evpn-ip-aliasing-05 basically e= xtends the baseline multi-homing mechanism of All-Active to L3 use cases mentioned in the draft (e.g., symmetric IRB)= . This draft is NOT intended for Single-Flow-Active multi-homing use case. =  If single-flow-active multi-homing need to get extended to L3 use cas= es, then it can be covered in a follow-up single-flow-active draft.

 

Cheers,

Ali

 

From: Alexander Vainshtein <Alexander.Vains= htein@rbbn.com>
Date: Thursday, November 17, 2022 at 2:25 AM
To: draft-sajassi-bess-evpn-ip-aliasing@ietf.org <draft-sajassi-b= ess-evpn-ip-aliasing@ietf.org>
Cc: Luc Andr=E9 Burdet <laburdet.ietf@gmail.com>, bess@ietf.or= g <bess@ietf.org>, Nitsan Dolev <Nitsan.Dolev@rbbn.com>, Alexan= der Ferdman <Alexander.Ferdman@rbbn.com>, Ron Sdayoor <Ron.Sdayoor= @rbbn.com>, Dmitry Valdman <Dmitry.Valdman@rbbn.com>
Subject: A doubt about draft-sajassi-bess-evpn-ip-aliasing-05

Hi,

I have doubts regarding applicability of the solution for L3 fast co= nvergence defined in draft-sajassi-bess-evpn-ip-aliasing-05 for the scenarios in which the M= H ES in question operates in Single Flow-Active load-balancing mode as desc= ribed in draft-ietf-bess-evpn-l2gw-proto-02.

 

These doubts are based on the fact that, in Single Flow-Active load-= balancing mode, the Primary PE is defined by the Layer 2 Control Protocol (= or its equivalent) for each specific host, while the EVPN IP Aliasing draft advertises Primary/Backup paths via= P/B bits in the EVPN Layer 2 Extended Community attached to the IP A-D EVP= N routes.

 

What, if anything, did I miss?

 

Your feedback would be highly appreciated.

 

Regards, and lots of thanks in advance,

Sasha

 


Notice: This e-mail together with any attachments may contain information o= f Ribbon Communications Inc. and its Affiliates that is confidential and/or= proprietary for the sole use of the intended recipient. Any review, disclo= sure, reliance or distribution by others or forwarding without express permission is strictly prohibited. If= you are not the intended recipient, please notify the sender immediately a= nd then delete all copies, including any attachments.

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