Hi Bob, * *If* the AR REPLICATOR behaviors are removed from that draft,I think the hub/spoke scenario can't be well supported because that the RRs are widely used. What do you mean by *if* in the above statement? It is the designed behavior with hub and spoke scenario – with that do you still think there is a problem?
RR is only used for route distribution and should not make any difference. Thanks. Jeffrey Juniper Business Use Only From: wang.yub...@zte.com.cn <wang.yub...@zte.com.cn> Sent: Thursday, August 20, 2020 9:52 PM To: bess@ietf.org; Jeffrey (Zhaohui) Zhang <zzh...@juniper.net>; alexander.vainsht...@rbbn.com Cc: alexander.vainsht...@rbbn.com; draft-wang-bess-evpn-context-la...@ietf.org; michael.gorokhov...@rbbn.com; ext-zhang.zh...@zte.com.cn <zhang.zh...@zte.com.cn>; chen....@zte.com.cn Subject: Re:Hub-and-spoke support in EVPN: RFC 8317 vs.draft-wang-bess-evpn-context-label-04 [External Email. Be cautious of content] Hi Jeffrey and Sasha, The flows of E-tree services typically are P2MP conections, But the flows of hub/spoke services typically are MP2MP connections, the spoke PEs can connect to each other under the assistance of the hub PE. The hub/spoke services is actually a special pattern of VPLS, whose MP2MP nature will be persisted. So they are very different as what Jeffrey has pointed out. But the hub/spoke secenario is very similar to the AR REPLICATOR/LEAF, IMHO. And draft-ietf-bess-evpn-virtual-hub already applied a certain extent of AR REPLICATOR behaviors to the hub PEs. The only issues remained in draft-ietf-bess-evpn-virtual-hub is that when RRs exists between hub-PE and spoke-PEs. If the AR REPLICATOR behaviors are removed from that draft, I think the hub/spoke scenario can't be well supported because that the RRs are widely used. and the AR REPLICATOR behaviors will still be required even if there are no RRs. And I think the approaches discribed in draft-wang-bess-evpn-context-label-04 can solve the problems caused by RR existence. Best Regards, Bob 原始邮件 发件人：Jeffrey(Zhaohui)Zhang <zzh...@juniper.net<mailto:zzh...@juniper.net>> 收件人：Alexander Vainshtein <alexander.vainsht...@rbbn.com<mailto:alexander.vainsht...@rbbn.com>>;draft-wang-bess-evpn-context-la...@ietf.org <draft-wang-bess-evpn-context-la...@ietf.org<mailto:draft-wang-bess-evpn-context-la...@ietf.org>>; 抄送人：Michael Gorokhovsky <michael.gorokhov...@rbbn.com<mailto:michael.gorokhov...@rbbn.com>>;bess@ietf.org <bess@ietf.org<mailto:bess@ietf.org>>; 日 期 ：2020年08月20日 22:46 主 题 ：RE: Hub-and-spoke support in EVPN: RFC 8317 vs.draft-wang-bess-evpn-context-label-04 Hub and spoke EVPN and E-tree are different. However, draft-ietf-bess-evpn-virtual-hub should address the following two at least: * MPLS EVPN can't support hub/spoke usecase, where the spoke PEs can only connect to each other through the hub PE. Especially when at least two of the spoke PEs are connected to a common route reflector. * MPLS EVPN can't work as an AR-REPLICATOR. Because the AR- REPLICATOR will apply replication for the ingress AR-LEAF too. But a packet shoud not be sent back to the AR-LEAF where it is received from. Jeffrey Juniper Business Use Only From: BESS <bess-boun...@ietf.org<mailto:bess-boun...@ietf.org>> On Behalf Of Alexander Vainshtein Sent: Thursday, August 20, 2020 9:36 AM To: draft-wang-bess-evpn-context-la...@ietf.org<mailto:draft-wang-bess-evpn-context-la...@ietf.org> Cc: Michael Gorokhovsky <michael.gorokhov...@rbbn.com<mailto:michael.gorokhov...@rbbn.com>>; bess@ietf.org<mailto:bess@ietf.org> Subject: [bess] Hub-and-spoke support in EVPN: RFC 8317 vs. draft-wang-bess-evpn-context-label-04 [External Email. Be cautious of content] Dear authors of draft-wang-bess-evpn-context-label-04, Section 2 “Problem Statement” of draft-wang-bess-evpn-context-label-04 states that “MPLS EVPN can't support hub/spoke use case, where the spoke PEs can only connect to each other through the hub PE. Especially when at least two of the spoke PEs are connected to a common route reflector”. I have to admit that I do not understand why support of the generic E-Tree functionality in EVPN defined inRFC 8317<https://urldefense.com/v3/__https:/tools.ietf.org/html/rfc8317__;!!NEt6yMaO-gk!QRZOPg7Or-dqLm0vGwqM2vyyPBISCyDo4uu4Jq2MEDW8fuSMZV6tLNIvZnaam81J$> is not sufficient for handling this use case. In particular I do not see why connection of Spoke PEs to a common RR affects the EVPN behavior (or L3vPN Hub-and-Spoke VPN behavior as defined inSection 4.3.5 of RFC 4364<https://urldefense.com/v3/__https:/tools.ietf.org/html/rfc4364*section-4.3.5__;Iw!!NEt6yMaO-gk!QRZOPg7Or-dqLm0vGwqM2vyyPBISCyDo4uu4Jq2MEDW8fuSMZV6tLNIvZunniYWF$>) in any way. Regards, and lots of thanks in advance, Sasha Office: +972-39266302 Cell: +972-549266302 Email: alexander.vainsht...@ecitele.com<mailto:alexander.vainsht...@ecitele.com> ________________________________ Notice: This e-mail together with any attachments may contain information of Ribbon Communications Inc. that is confidential and/or proprietary for the sole use of the intended recipient. Any review, disclosure, 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 and then delete all copies, including any attachments. ________________________________
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