Tag Archives: LDP

A network engineer is configuring a newly installed PE router at the regional gateway location. The new PE router must use MPLS core routing protocols with the existing P router, and LDP sessions between the two routers must be protected to provide faster MPLS convergence. Which configuration must the engineer perform on the network so that LDP sessions are established?

A. Enable communication over TCP port 646 for T-LDP hello messages. B. Enable RSVP-TE FRR on the LDP interface to protect the LDP session between routers. C. Enable LDP session protection on either one of the routers, which allows them to autonegotiate. D. Set the LDP session protection timer on each router to the same value. Answer: Option… Read More »

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?

A. Configure a targeted neighbor session. B. Configure an access list on the interface to permit TCP and UDP traffic. C. Configure a Cisco MPLS TE tunnel on both ends of the session. D. Configure the interface bandwidth to handle TCP and UDP traffic between the LDP peers. Answer: Option A. Explanation:  https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_ldp/configuration/12-4m/mp-ldp-12-4m-book.pdf Show AnswerDiscussion The post An… Read More »

Router 1 and router 2 are running OSPF Area 0. The router logs on both routers show that the LDP link has flapped. Which configuration must the engineer apply to the two routers to implement session protection on the link?

Refer to the exhibit. Router 1 and router 2 are running OSPF Area 0. The router logs on both routers show that the LDP link has flapped. Which configuration must the engineer apply to the two routers to implement session protection on the link? A. Router 1(config)# ip cef distributed Router 1(config)# mpls ldp session protection global Router… Read More »

The network team must implement MPLS LDP session protection with two requirements: * Session protection is provided for core loopback IP addresses only. * The LDP session must remain operational for one hour when the WAN link on PE-XR1 fails. Which configuration must the team implement on PE-XR1?

Refer to the exhibit. The network team must implement MPLS LDP session protection with two requirements: * Session protection is provided for core loopback IP addresses only. * The LDP session must remain operational for one hour when the WAN link on PE-XR1 fails. Which configuration must the team implement on PE-XR1? A. configure terminal ipv4 access-list LDP-SESSION-PROTECTION… Read More »

An engineer is investigating an MPLS LDP issue. Which command should an engineer use on a Cisco IOS XE device to display the contents of the LFIB?

A. show mpls forwarding-table B. show mpls ldp neighbors C. show mpls ldp labels D. show mpls ldp bindings Answer: Option A. Explanation:  Reference: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mpls/command/mp-cr-book/mp-s2.html Show AnswerDiscussion The post An engineer is investigating an MPLS LDP issue. Which command should an engineer use on a Cisco IOS XE device to display the contents of the LFIB? appeared first… Read More »