An engineer is implementing a Cisco MPLS TE tunnel to improve the streaming experience for the clients of a video-on-demand server. Which action must the engineer perform to configure extended discovery to support the MPLS LDP session between the headend and tailend routers?
To configure extended discovery to support an MPLS LDP session between non-directly connected headend and tailend routers, the engineer must configure a targeted neighbor session. A targeted LDP session is required to establish a label distribution protocol (LDP) session between routers that are not directly connected, and this is achieved by manually configuring a targeted neighbor. This involves sending a targeted Hello message as a unicast packet specifically addressed to the targeted LSR (Label Switching Router).
AToM and some Traffic Engineering scenarios are examples of these applications that require a targeted LDP session between non directly connected routers. The command mpls ldp neighbor [vrf vpn-name] ip-addr targeted [ldp | tdp] can be used to manually configure targeted LDP sessions between peers. Answer A
its C https://community.cisco.com/t5/mpls/mpls-te-tunnel-targeted-ldp-session/td-p/2863558
A is the best match for me. Anyone agree or disagree? If the LSR is more than one hop from its neighbor, it is nondirectly connected to its neighbor. For these nondirectly connected neighbors, the LSR sends out a targeted Hello message as a UDP packet, but as a unicast message specifically addressed to that LSR. The nondirectly connected LSR responds to the Hello message and the two routers begin to establish an LDP session. This is called EXTENDED DISCOVERY. An MPLS LDP targeted session is a label distribution session between routers that are not directly connected. When you create an MPLS traffic engineering tunnel interface, you need to establish a label distribution session between the tunnel headend and the tailend routers. You establish nondirectly connected MPLS LDP sessions by enabling the transmission of targeted Hello messages. You can use the ****mpls ldp neighbor targeted****command to set up a targeted session when other means of establishing targeted sessions do not apply, such as configuring mpls ip on a traffic engineering (TE)....
Has to be A!
They are mentioning extended discovery, and this is targeted LDP. A is the best answer to this stupid question.
A is correct 100%
C is the best one