公开(公告)号：US20150334667A1

公开(公告)日：2015-11-19

申请号：US14808469

申请日：2015-07-24

Applicant: Cisco Technology, Inc.

Inventor： Bin Mo ,  David Ojemann ,  George Swallow

IPC: H04W56/00 ,  H04L12/723

CPC classification number: H04W56/002 ,  H04L45/02 ,  H04L45/507

Abstract: A technique may improve LDP-IGP synchronization in a MPLS network when an interface of a router coupled to a communications link along a shortest path between a source router and a destination router becomes newly active. Specifically, an IGP adjacency may be held down over the newly active link while a LDP adjacency is established over the link. The router may inject a temporary, non-redistributable route having a large administrative weight into its routing table utilizing addresses learned during establishment of the LDP adjacency. The injected route ensures that there is a reachable route to a peer router so that LDP may converge. After LDP has converged and all needed label bindings have been distributed in the MPLS network utilizing the injected route, IGP executing on the router may advertise a normal cost metric for the link associated with the newly active interface, and IGP convergence may be completed.

Abstract translation: 当沿着源路由器和目的地路由器之间的最短路径的通信链路的路由器的接口变为新活动时，技术可以改善MPLS网络中的LDP-IGP同步。 具体地说，可以通过链路建立LDP邻接关系，在新活动链路上保持IGP邻接关系。 路由器可以利用在建立LDP邻接过程中学习到的地址，向其路由表中注入具有较大管理权限的临时的，不可重新分发的路由。 注入的路由确保存在到对等路由器的可达路由，以便LDP可以收敛。 LDP已经融合，所有需要的标签绑定都使用注入的路由分布在MPLS网络中，路由器上执行的IGP可以为与新活动接口相关联的链路通告正常的成本指标，并且可以完成IGP收敛。

公开(公告)号：US09398553B2

公开(公告)日：2016-07-19

申请号：US14808469

申请日：2015-07-24

Applicant: Cisco Technology, Inc.

Inventor： Bin Mo ,  David Ojemann ,  George Swallow

IPC: H04L12/28 ,  H04J3/06 ,  H04W56/00 ,  H04L12/723 ,  H04L12/751

CPC classification number: H04W56/002 ,  H04L45/02 ,  H04L45/507

Abstract: A technique may improve LDP-IGP synchronization in a MPLS network when an interface of a router coupled to a communications link along a shortest path between a source router and a destination router becomes newly active. Specifically, an IGP adjacency may be held down over the newly active link while a LDP adjacency is established over the link. The router may inject a temporary, non-redistributable route having a large administrative weight into its routing table utilizing addresses learned during establishment of the LDP adjacency. The injected route ensures that there is a reachable route to a peer router so that LDP may converge. After LDP has converged and all needed label bindings have been distributed in the MPLS network utilizing the injected route, IGP executing on the router may advertise a normal cost metric for the link associated with the newly active interface, and IGP convergence may be completed.