发明名称 |
Selective label retention in a label switching network |
摘要 |
In one embodiment, a method includes receiving from a label distribution peer, a prefix/FEC to label mapping at a network device and processing the prefix/FEC to label mapping at the network device, wherein processing includes determining if a next hop interface of the prefix/FEC is in a same area as a link between the network device and the label distribution peer. The method further includes retaining the prefix/FEC to label mapping if the label distribution peer is a next hop for the prefix/FEC and if the next hop interface of the prefix/FEC is in the same area as the link between the network device and the label distribution peer, otherwise discarding the prefix/FEC to label mapping. An apparatus is also disclosed. |
申请公布号 |
US8891553(B2) |
申请公布日期 |
2014.11.18 |
申请号 |
US200912653691 |
申请日期 |
2009.12.16 |
申请人 |
Cisco Technology, Inc. |
发明人 |
Guichard Jim;Rosen Eric;Raza Syed Kamran |
分类号 |
H04J3/24;H04L29/06;H04L12/723;H04L12/715;H04L12/66;H04L12/70 |
主分类号 |
H04J3/24 |
代理机构 |
|
代理人 |
Kaplan Cindy |
主权项 |
1. A method comprising:
receiving from a label distribution peer, a prefix/FEC (Forwarding Equivalence Class) to label mapping at a network device; processing said prefix/FEC to label mapping at the network device to implement selective label retention on a per neighbor basis if the label distribution peer is a next hop for said prefix/FEC, wherein processing comprises:
determining if a next hop interface of said prefix/FEC is in a same IGP (Interior Gateway Protocol) or IS-IS (Intermediate System-to-Intermediate System) area as a link between the network device and the label distribution peer; andretaining said prefix/FEC to label mapping if said next hop interface of said prefix/FEC is in the same area as the link between the network device and the label distribution peer;discarding said prefix/FEC to label mapping if said next hop interface of said prefix/FEC is not in the same area as the link between the network device and the label distribution peer. |
地址 |
San Jose CA US |