Refer to the exhibit. Between which routers is an LDP session established?
A. R1 and R3
B. R1, R2 and R3
C. R2 and R3
D. R1 and R2
Which routers is an LDP session established?
Refer to the exhibit. Between which routers is an LDP session established?
A. R1 and R3
B. R1, R2 and R3
C. R2 and R3
D. R1 and R2
No session will be established with the current figure. For the LDP session to mount peer needs a route to the router-id. R1 fa0/1 (10.10.10.9/30) R2 fa0/0 (10.10.10.2/30) > Different IP subnet
R1 fa0/0 (10.10.10.1/30) R3 fa0/0 (10.10.10.10/30) > Different IP subnet.
Hence no session will be established.
If the figure is changed to
R1 fa0/0 (10.10.10.9/30) R2 fa0/0 (10.10.10.2/30) > Different IP subnet
R1 fa0/1 (10.10.10.1/30) R3 fa0/0 (10.10.10.10/30) > Different IP subnet.
R3 & R1 will establish a session since router is updating RID to fa0/1. R2 won’t have a route to 10.10.10.9 unless running a routing protocol, hence won’t be able to establish the session.
Router3 have no any route to fa 0/2
fa 0/2 forced RID for LDP on router1
Answer: A
Explanation: for the LDP session to mount peer need a route to the router-id, since the middle router “R1” is forcing to F0/1 and no IGP seems to be in place the only session would be between the leftmost and the middle one (R1 and R3)
Could anyone explain why LDP is not established btween r2 and r3 in this case?