公开(公告)号：US20180234338A1

公开(公告)日：2018-08-16

申请号：US15947737

申请日：2018-04-06

Applicant: Telefonaktiebolaget LM Ericsson (publ)

Inventor： Evgeny TANTSURA ,  Gregory MIRSKY

IPC: H04L12/721

Abstract: A method implemented by a network device acting as a border gateway protocol (BGP) speaker, of exposing a maximum segment identifier depth (MSD) value of the network device is described. The method comprises encoding the MSD value into a BGP Link State (BGP-LS) extension message. The BGP-LS extension message includes a type, a length and a MSD value. The type indicates the type of the MSD value, the length indicates the length of the MSD value and the MSD value indicates a lowest MSD value supported by the network device for enabling segment routing. The method continues with transmitting the BGP-LS extension message including the type, the length, and the MSD value to a network controller, where the network controller is to use the MSD value to compute a segment routing path including the network device.

公开(公告)号：US20210092044A1

公开(公告)日：2021-03-25

申请号：US16077853

申请日：2016-04-01

Applicant: Telefonaktiebolaget LM Ericsson (publ)

Inventor： Evgeny TANTSURA ,  Uma S. CHUNDURI

IPC: H04L12/721 ,  H04L12/717 ,  H04L12/741

Abstract: Techniques for exposing maximum node and/or link segment identifier depth using OSPF are described. A network element in a Segment Routing (SR) network transmits a Type Length Value (TLV) element including a Maximum Segment Identifier Depth (MSD) value utilizing OSPF. The MSD value identifies a maximum number of segment identifier (SID) labels that the network element is able to push into packet headers of received packets to enable forwarding of the received packets through the SR network. The network element receives, from a controller, data for a path to be utilized by the network element for forwarding the received packets through the SR network. The data includes one or more SID labels to be pushed into the received packets, and the SID labels have fewer than or equal to the MSD value. The controller and the network element do not utilize Path Computation Element Protocol (PCEP) over a southbound interface.

公开(公告)号：US20190089627A1

公开(公告)日：2019-03-21

申请号：US16084960

申请日：2016-04-29

Applicant: Telefonaktiebolaget LM Ericsson (publ)

Inventor： Gregory MIRSKY ,  Evgeny TANTSURA

IPC: H04L12/703 ,  H04L12/709 ,  H04L12/723 ,  H04L12/707 ,  H04L12/761 ,  H04L12/26 ,  H04L12/749

CPC classification number: H04L45/28 ,  H04L43/0811 ,  H04L45/16 ,  H04L45/22 ,  H04L45/245 ,  H04L45/50 ,  H04L45/741 ,  Y02D50/30

Abstract: Methods and apparatuses for enabling sub-seconds link failure detection in a multi-chassis link aggregation group (MC-LAG) system are described. A first network device of a packet network transmits a Multiprotocol Label Switching (MPLS) encapsulated packet over a first link that is part of the MC-LAG, where the MC-LAG couples the first network device with a second network device and a third network device and the second and third network devices are part of an inter-chassis redundancy (ICR) system. The MPLS encapsulated packet includes a generic associated channel header (ACH) and a payload, and where the payload includes a bidirectional forwarding detection (BFD) control packet.

公开(公告)号：US20200153733A1

公开(公告)日：2020-05-14

申请号：US16077848

申请日：2016-04-01

Applicant: Telefonaktiebolaget LM Ericsson (publ)

Inventor： Uma S. CHUNDURI ,  Amarnath AMMIREDDY ,  Evgeny TANTSURA

IPC: H04L12/723 ,  H04L12/707 ,  H04L12/46 ,  H04L12/715 ,  H04L12/725 ,  H04L12/721

Abstract: A router operates in both a Segment Routing (SR) network portion and a Multiprotocol Label Switching (MPLS) network portion of a network that utilizes Intermediate System to Intermediate System (IS-IS). The router receives an IS-IS advertisement message originated by a mapping server that includes a sub-Type-length-value (sub-TLV) element that identifies a preferred type of path across the MPLS network portion for an identifiable set of traffic to be received by the router from the SR network portion. The router identifies, based at least in part upon the sub-TLV element, one path of a plurality of available paths across the MPLS network portion for the identifiable set of traffic, and configures its forwarding plane to utilize the identified one path for the identifiable set of traffic. The IS-IS advertisement message can be an IS-IS TLV such as a SID/Label Binding TLV 149 or Multi-topology SID/Label Binding TLV 150.

公开(公告)号：US20190109785A1

公开(公告)日：2019-04-11

申请号：US16089123

申请日：2016-05-31

Applicant: Telefonaktiebolaget LM Ericsson (publ)

Inventor： Uma S. CHUNDURI ,  Kiran SASIDHARAN PILLAI ,  Evgeny TANTSURA

IPC: H04L12/721 ,  H04L12/741

CPC classification number: H04L45/68 ,  H04L45/32 ,  H04L45/54

Abstract: A method is implemented by a first Provider Edge (PE) network device in a network to configure a pseudo-wire (PW) between the first PE network device and a second PE network device in the network using an Interior Gateway Protocol (IGP). The method includes receiving a first advertisement message flooded in the network by the second PE network device via the IGP, where the first advertisement messge advertises the PW. The method further includes configuring a local forwarding information base with a local PW label associated with the PW such that the first PE network device forwards traffic encapsulated with the local PW label to an Attachment Circuit associated with the PW and flooding a second advertisement message in the network via the IGP that includes an indication that the first PE network device is ready to receive traffic from the second PE network device over the PW.

公开(公告)号：US20190097928A1

公开(公告)日：2019-03-28

申请号：US16089125

申请日：2016-05-31

Applicant: Telefonaktiebolaget LM Ericsson (publ)

Inventor： Uma S. CHUNDURI ,  Kiran SASIDHARAN PILLAI ,  Evgeny TANTSURA

IPC: H04L12/721 ,  H04L12/715 ,  H04L12/751 ,  H04L12/723 ,  H04L12/46

CPC classification number: H04L45/68 ,  H04L12/4633 ,  H04L45/02 ,  H04L45/04 ,  H04L45/50

Abstract: A method is implemented by a first Provider Edge (PE) network device in a network to configure a pseudo-wire (PW) between the first PE network device and a second PE network device in the network using Intermediate System to Intermediate System (IS-IS). The method includes receiving a first LSP update flooded in the network by the second PE network device via IS-IS, where the first LSP update advertises the PW. The method further includes configuring a local forwarding information base with a local PW label associated with the PW such that the first PE network device forwards traffic encapsulated with the local PW label to an Attachment Circuit associated with the PW and flooding a second LSP update in the network via IS-IS that includes an indication that the first PE network device is ready to receive traffic from the second PE network device over the PW.

公开(公告)号：US20190058657A1

公开(公告)日：2019-02-21

申请号：US16077837

申请日：2016-04-01

Applicant: Telefonaktiebolaget LM Ericsson (publ)

Inventor： Uma S. CHUNDURI ,  Evgeny TANTSURA ,  Amarnath AMMIREDDY

IPC: H04L12/723 ,  H04L12/721 ,  H04L12/717

Abstract: A router operates in both a Segment Routing (SR) network portion and a Multiprotocol Label Switching (MPLS) network portion of a network that utilizes Open Shortest Path First (OSPF). The router receives an OSPF advertisement message originated by a mapping server that includes a sub-Type-length-value (sub-TLV) element that identifies a preferred type of path across the MPLS network portion for an identifiable set of traffic that is to be received by the router from the SR network portion. The router identifies, based at least in part upon the sub-TLV element, one path of a plurality of available paths across the MPLS network portion for the identifiable set of traffic, and configures its forwarding plane to utilize the identified one path accordingly for the identifiable set of traffic. The OSPF advertisement message can be an OSPF LSA, and can carry an Extended Prefix Range TLV including the sub-TLV element.

公开(公告)号：US20210092052A1

公开(公告)日：2021-03-25

申请号：US16077857

申请日：2016-04-01

Applicant: Telefonaktiebolaget LM Ericsson (publ)

Inventor： Evgeny TANTSURA ,  Uma S. CHUNDURI

IPC: H04L12/721 ,  H04L12/717 ,  H04L12/707 ,  H04L12/751

Abstract: Techniques for exposing maximum node and/or link segment identifier depth using IS-IS are described. A network element in a Segment Routing (SR) network transmits a Type Length Value (TLV) element including a Maximum Segment Identifier Depth (MSD) value. The MSD value identifies a maximum number of segment identifier (SID) labels that the network element is able to push into packet headers of received packets to enable forwarding of the received packets through the SR network. The network element receives, from a controller, data for a path to be utilized by the network element for forwarding the received packets through the SR network. The data includes one or more SID labels to be pushed into the received packets, and the SID labels include fewer than or equal to the MSD value. The controller and the network element do not utilize the Path Computation Element Protocol (PCEP) over a southbound interface.

公开(公告)号：US20200267079A1

公开(公告)日：2020-08-20

申请号：US16869391

申请日：2020-05-07

Applicant: Telefonaktiebolaget LM Ericsson (publ)

Inventor： Evgeny TANTSURA ,  Gregory MIRSKY

IPC: H04L12/721

Abstract: A method of exposing a maximum segment identifier depth (MSD) value of the network device is described. The method comprises transmitting to a centralized controller an attribute Type Length Value (TLV). A type of the attribute TLV includes a type of a maximum segment identifier depth (MSD) indicating that the MSD is a link MSD, a length of the attribute TLV includes a length of the MSD, and a value of the attribute TLV includes the MSD, which is a maximum number of segment routing (SR) labels supported at a link of the network node. The centralized controller is to use the attribute TLV to compute an SR tunnel with one or more SR labels, a label stack depth of the SR tunnel does not exceed the MSD, and the SR labels are used for steering a packet through an SR network.

公开(公告)号：US20190058653A1

公开(公告)日：2019-02-21

申请号：US16084963

申请日：2016-04-29

Applicant: Telefonaktiebolaget LM Ericsson (publ)

Inventor： Gregory MIRSKY ,  Evgeny TANTSURA

IPC: H04L12/703 ,  H04L12/709 ,  H04L12/24 ,  H04L12/749

Abstract: Methods and apparatuses for enabling sub-seconds link failure detection in a multi-chassis link aggregation group (MC-LAG) system are described. A first network device of a packet network transmits an IP packet over a first link that is part of the MC-LAG, where the MC-LAG couples the first network device with a second network device and a third network device and the second and third network devices are part of an Inter-Chassis Redundancy (ICR) system. The IP packet includes a payload including a Bidirectional Forwarding Detection (BFD) control packet, where the destination address of the IP packet is one of a multicast IP address and a broadcast IP address.