MPLS - Advanced RSVP Concepts QUESTIONS AND ANSWERS 100%ACCURATE.
What does the Label_Request object do and how is it distributed? - ✅✅It is distributed with
the RSVP Path message and it asks intermediate LSRs and the eLER to provide a label bindings
for the path
What is the issue that RSVP runs into with end to end addressing - ✅✅it is unable to read all
of the packet headers
Why is the Router Alert Object set in the IP Header with RSVP? - ✅✅This ensures that all
receiving routers are instructed to decapsulate and process the RSVP message in their control
plane and take any necessary action, despite the end 2 end addressing
What are the purposes of the two main objects in an RSVP Path Message? - ✅✅1) Keep track
of the interface being egressed
2) Indicate that it wants a label
Now what are these two objects called? - ✅✅HOP - tracks the interface being egressed
LABEL_REQUEST - indicates it wants a label
What happens when the PATH message leaves - ✅✅The information is lost on the router
How is this information then stored? What object is used? - ✅✅Path State Block
What object is created and stored at each hop? - ✅✅Path State Block
What two things need to be present to generate an RSVP Session on a router? - ✅✅Path State
Block & Reservation State Block
How do the RESV object and the HOP object interact? - ✅✅The destination address used in
the RESV message is taken from the HOP object of the previously created PSB
What is the difference between the retry timer and the resignal timer? - ✅✅The difference
between the retry timer & the resignal timer is that the retry timer is designed to fix a broken
path whereas the resignal timer tries to optimize an optimal path
tl;dr: Retry - return to primary; Resignal - create new primary
What does the Label_Request object do and how is it distributed? - ✅✅It is distributed with
the RSVP Path message and it asks intermediate LSRs and the eLER to provide a label bindings
for the path
What is the issue that RSVP runs into with end to end addressing - ✅✅it is unable to read all
of the packet headers
Why is the Router Alert Object set in the IP Header with RSVP? - ✅✅This ensures that all
receiving routers are instructed to decapsulate and process the RSVP message in their control
plane and take any necessary action, despite the end 2 end addressing
What are the purposes of the two main objects in an RSVP Path Message? - ✅✅1) Keep track
of the interface being egressed
2) Indicate that it wants a label
Now what are these two objects called? - ✅✅HOP - tracks the interface being egressed
LABEL_REQUEST - indicates it wants a label
What happens when the PATH message leaves - ✅✅The information is lost on the router
How is this information then stored? What object is used? - ✅✅Path State Block
What object is created and stored at each hop? - ✅✅Path State Block
What two things need to be present to generate an RSVP Session on a router? - ✅✅Path State
Block & Reservation State Block
How do the RESV object and the HOP object interact? - ✅✅The destination address used in
the RESV message is taken from the HOP object of the previously created PSB
What is the difference between the retry timer and the resignal timer? - ✅✅The difference
between the retry timer & the resignal timer is that the retry timer is designed to fix a broken
path whereas the resignal timer tries to optimize an optimal path
tl;dr: Retry - return to primary; Resignal - create new primary
