Preemption is a mechanism that allows a higher priority LSP to tear down an existing lower priority LSP in order to obtain the required resources for its establishment. Preemption can occur when there is not enough bandwidth or other resources available on a link or node to accommodate a new LSP request. In this case, the node can select one or more lower priority LSPs that are using the resources and send them a PathErr message with a Preempt error code. This causes the lower priority LSPs to beterminated and release their resources. The node can then allocate the resources to the higher priority LSP and send a Resv message to confirm its reservation34. References:
A Label Switched Path (LSP) is the path created by MPLS nodes that use labels to forward packets across the network. A label is a short identifier that is attached to each packet and indicates the next hop or destination of the packet. The nodes use a label forwarding table to switch packets based on their labels, without inspecting the packet headers. This can improve the performance, security, and quality of service of the network. An LSP can be established by using GMPLS protocols such as OSPF-TE and RSVP-TE, which exchange information about the network topology, resources, and constraints. References : Nokia GMPLS-controlled Optical Networks Course | Nokia, GMPLS - Nokia
Victoria
Hey, guess what? I passed the certification exam! I couldn't have done it without Cramkey Dumps.
IsabelDec 28, 2025
Same here! I was so surprised when I saw that almost all the questions on the exam were exactly what I found in their study materials.
Carson
Yeah, definitely. I would definitely recommend Cramkey Dumps to anyone who is preparing for an exam.
RufusDec 16, 2025
Me too. They're a lifesaver!
Kingsley
Do anyone guide my how these dumps would be helpful for new students like me?
HarisDec 11, 2025
Absolutely! They are highly recommended for anyone looking to pass their certification exam. The dumps are easy to understand and follow, making it easier for you to study and retain the information.
Josie
I just passed my certification exam using their dumps and I must say, I was thoroughly impressed.
FatimahDec 18, 2025
You’re right. The dumps were authentic and covered all the important topics. I felt confident going into the exam and it paid off.
Aryan
Absolutely rocked! They are an excellent investment for anyone who wants to pass the exam on the first try. They save you time and effort by providing a comprehensive overview of the exam content, and they give you a competitive edge by giving you access to the latest information. So, I definitely recommend them to new students.
JessieDec 18, 2025
did you use PDF or Engine? Which one is most useful?
Question 10
What is the Commissioning File in GMRE nodes?
Options:
A.
A file with commissioned GMRE nodes for NPA implementation
B.
A file of optical impairment parameters for power balance
C.
A file with target values that determine whether a given LSP is possible
The Commissioning File in GMRE nodes is a file with target values that determine whether a given LSP is possible. The Commissioning File contains parameters such as power, OSNR, Q-factor, and dispersion that are used to evaluate the feasibility of an LSP request. The Commissioning File is generated by the Network Planning Application (NPA) based on the network design and optical impairments. The Commissioning File is uploaded to each GMRE node and is used by the CSPF algorithm to find a suitable path for the LSP. References : Nokia GMPLS-controlled Optical Networks Course | Nokia, Network Planning Application (NPA) | Nokia
Question 11
Which of the following parameters is not considered when restoring an LSP?
The equipment vendor is not a parameter that is considered when restoring an LSP. Restoration is the process of re-establishing an LSP after a failure by using an alternative path that meets the same constraints as the original LSP. The parameters that are considered when restoring an LSP include coloring, reservation priority, maximum latency, bandwidth, protection type, and other QoS attributes. The equipment vendor does not affect the restoration process as long as the nodes support GMPLS protocols and interoperate with each other. References : RFC 4427 - Recovery (Protection and Restoration) Terminology for Generalized Multi-Protocol Label Switching (GMPLS), [Nokia GMPLS-controlled Optical Networks Course | Nokia]
