公开(公告)号：US20220224593A1

公开(公告)日：2022-07-14

申请号：US17657382

申请日：2022-03-31

Applicant: Juniper Networks, Inc.

Inventor： Channasangamesh S. Hugar ,  Babu Singarayan ,  Sharmila Koppula ,  Soumyodeep Joarder ,  Sudhin Jacob

IPC: H04L41/0654 ,  H04L12/46 ,  H04L45/02

Abstract: Techniques are described to provide layer 2 (L2) circuit failover in the event connectivity to an Ethernet Virtual Private Network (EVPN) instance is lost. For example, if one of multi-homed provider edge (PE) devices loses connectivity to the EVPN instance, the PE device may mark its customer-facing interface as down and propagate the interface status to the access node such that the access node may update its routing information to switch L2 circuits to another one of the multi-homed PE devices having reachability to the EVPN instance. In some examples, the plurality of PE devices may further implement Connectivity Fault Management (CFM) techniques to propagate the interface status to the access node such that the access node may update its forwarding information to send traffic on a different L2 circuit to another one of the multi-homed PE devices having reachability to the EVPN instance.

公开(公告)号：US11057295B1

公开(公告)日：2021-07-06

申请号：US16777526

申请日：2020-01-30

Applicant: Juniper Networks, Inc.

Inventor： Wen Lin ,  Yi Zheng ,  SelvaKumar Sivaraj ,  Vasudevan Venkatraman ,  Prabhu Raj V. K. ,  Channasangamesh S. Hugar

IPC: H04L12/729 ,  H04L12/707 ,  H04L12/723 ,  H04L12/717 ,  H04L12/46 ,  H04L29/06

Abstract: The problem of looping at the egress of a transport network with a CE multihomed to a protected egress PE and a backup/protector egress PE can be avoided by (a) enabling the protector egress PE to distinguish between fast reroute (FRR) traffic coming from the protected egress PE and normal known unicast (KU) traffic coming from a PE of the transport network that is not attached to the same multihomed segment; (b) receiving, by the protector egress PE, known unicast data, to be forwarded to the CE; (c) determining, by the protector egress PE, that a link between it and the CE is unavailable; and (d) responsive to determining that the link between the protector egress PE and the CE is unavailable, (1) determining whether the known unicast traffic received was sent from the protected egress PE or from another PE of the transport network that is not attached to the same multihomed segment, and (2) responsive to a determination that the known unicast traffic received was sent from the protected egress PE, discarding the known unicast traffic received, and otherwise, responsive to a determination that the known unicast (KU) traffic received was sent from another PE of the transport network that is not attached to the same multihomed segment, sending the known unicast traffic, via a backup tunnel, to an egress PE which protects the protector egress PE.

公开(公告)号：US20200213182A1

公开(公告)日：2020-07-02

申请号：US16235230

申请日：2018-12-28

Applicant: Juniper Networks, Inc.

Inventor： Channasangamesh S. Hugar ,  Babu Singarayan ,  Sharmila Koppula ,  Soumyodeep Joarder ,  Sudhin Jacob

IPC: H04L12/24 ,  H04L12/46 ,  H04L12/751

Abstract: Techniques are described to provide layer 2 (L2) circuit failover in the event connectivity to an Ethernet Virtual Private Network (EVPN) instance is lost. For example, if one of multi-homed provider edge (PE) devices loses connectivity to the EVPN instance, the PE device may mark its customer-facing interface as down and propagate the interface status to the access node such that the access node may update its routing information to switch L2 circuits to another one of the multi-homed PE devices having reachability to the EVPN instance. In some examples, the plurality of PE devices may further implement Connectivity Fault Management (CFM) techniques to propagate the interface status to the access node such that the access node may update its forwarding information to send traffic on a different L2 circuit to another one of the multi-homed PE devices having reachability to the EVPN instance.

公开(公告)号：US20210211372A1

公开(公告)日：2021-07-08

申请号：US16777526

申请日：2020-01-30

Applicant: Juniper Networks, Inc.

Inventor： Wen Lin ,  Yi Zheng ,  SelvaKumar Sivaraj ,  Vasudevan Venkatraman ,  Prabhu Raj V.K. ,  Channasangamesh S. Hugar

IPC: H04L12/729 ,  H04L12/707 ,  H04L12/717 ,  H04L12/723 ,  H04L29/06 ,  H04L12/46

Abstract: The problem of looping at the egress of a transport network with a CE multihomed to a protected egress PE and a backup/protector egress PE can be avoided by (a) enabling the protector egress PE to distinguish between fast reroute (FRR) traffic coming from the protected egress PE and normal known unicast (KU) traffic coming from a PE of the transport network that is not attached to the same multihomed segment; (b) receiving, by the protector egress PE, known unicast data, to be forwarded to the CE; (c) determining, by the protector egress PE, that a link between it and the CE is unavailable; and (d) responsive to determining that the link between the protector egress PE and the CE is unavailable, (1) determining whether the known unicast traffic received was sent from the protected egress PE or from another PE of the transport network that is not attached to the same multihomed segment, and (2) responsive to a determination that the known unicast traffic received was sent from the protected egress PE, discarding the known unicast traffic received, and otherwise, responsive to a determination that the known unicast (KU) traffic received was sent from another PE of the transport network that is not attached to the same multihomed segment, sending the known multicast traffic, via a backup tunnel, to an egress PE which protects the protector egress PE.