US 11,888,734 B2
MPLS extension headers in mixed networks
James N. Guichard, Hollis, NH (US); Haoyu Song, San Francisco, CA (US); and Loa Andersson, Johanneshov (SE)
Assigned to Huawei Technologies Co., Ltd., Shenzhen (CN)
Filed by Huawei Technologies Co., Ltd., Shenzhen (CN)
Filed on Feb. 8, 2021, as Appl. No. 17/170,318.
Application 17/170,318 is a continuation of application No. PCT/CN2019/084813, filed on Apr. 28, 2019.
Claims priority of provisional application 62/815,633, filed on Mar. 8, 2019.
Prior Publication US 2021/0203599 A1, Jul. 1, 2021
Int. Cl. H04L 45/50 (2022.01); H04L 45/745 (2022.01); H04L 69/22 (2022.01)
CPC H04L 45/507 (2013.01) [H04L 45/745 (2013.01); H04L 69/22 (2013.01)] 26 Claims
OG exemplary drawing
 
22. An extension header capable (EH capable) Label Switching Router (LSR) comprising:
a processor and associated memory;
at least one interface coupled to the processor and associated memory, the at least one interface configured to receive and transmit packets of data to other Label Switching Routers (LSRs) included in a Multiprotocol Label Switching (MPLS) network;
the processor and associated memory configured to:
receive an advertisement message indicating whether a downstream LSR is extension header capable (EH capable);
receive a packet to be transmitted to the downstream LSR;
determine whether the packet includes one or more extension headers (EHs); and
insert an EH label into an MPLS label stack of the packet after determining the downstream LSR is EH capable and the packet does not include the one or more EHs.