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?
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?
To implement session protection on the link, the correct configuration involves ensuring that MPLS LDP (Label Distribution Protocol) is properly set up on the interfaces, along with enabling CEF (Cisco Express Forwarding) and configuring session protection. The correct steps include enabling CEF globally on both routers, configuring the IP addresses on the interfaces, setting the MPLS label protocol to LDP, enabling MPLS on the interfaces, and configuring LDP session protection globally. Hence, the configuration provided in option D is correct as it includes all these necessary steps.
By process of elimination, I labbed the commands. A: global keyword is not part of the command, mpls ldp session protection B: mpls ldp session proteccion command can't be entered in the interface configuration C: easiest elimination, bad subnet masks D: Correct answer
In B the session protect is configured under global (config)# --> (config)# mpls ldp session protection I think Jmbp12 is right
On B it is missing ip cef distributed on R2 but it is needed on both routers. I think D is the perfect and full configuration necessary.
B is missing CEF on R2 so cannot be B
The answer is B. The mpls ldp session protection command was not applied to the interface, it was applied in global config mode. Te questions says LDP flapped meaning LDP was previously configured so why should we enable MPLS again on the interfaces? For me the answer should be B.
The better is D A is wrong, coz there's no "global" in the "mpls ldp session protection" command. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_ldp/configuration/xe-16-5/mp-ldp-xe-16-5-book/mp-ldp-sessn-prot.html
Correct, the global keyword it not in that command so A is discarded, D is the better answer.
it would be B, LDP flapped, meaning it was configured already
But the IP address was also there before so why put that again and in B the ip cef distributed is MISSING on R2 where it is needed. D is correct configuration
A not ok because global keyword does not exist C not ok because the subnet masks are wrong B Looks almost ok, but exit from the interfaces is missing D. Looks ok
Can we configure "mpls label protocol ldp" on an interface, The answer is yes; it is possible to configure under the interface or global configuration mode.
Honestly such a dumb question... how can you have 2 answers to close to each other.. I mean both B and D will get the job done. I guess D is more complete.
The correct answer is B. The ldp command is running in global configuration mode. In answer D, it shows the ldp protocol command within the interface. This command is done in global mode to enable ldp as preferable to tdp.
Router 1(config)# ip cef distributed Router 1(config)# interface gigabitethernet 0/0 Router 1(config-if)# ip address 192.168.1.1 255.255.255.0 Router 1(config-if)# mpls label protocol ldp Router 1(config-if)# mpls ip Router 1(config-if)# exit Router 1(config)# mpls ldp session protection Router 2(config)# ip cef distributed Router 2(config)# interface gigabitethernet 0/0 Router 2(config-if)# ip address 192.168.1.2 255.255.255.0 Router 2(config-if)# mpls label protocol ldp Router 2(config-if)# mpls ip Router 2(config-if)# exit Router 2(config)# mpls ldp session protection D is correct
Answer is D The mpls ldp session protection is entered from the global config mode so you have to exit from the interface mode. This is how Cisco have documented it: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_ldp/configuration/15-s/mp-ldp-15-s-book/mp-ldp-sessn-prot.html
C is the most correct, because it exit out of interface config mode before apply ldp session protection on global.
Subnet mask on C is incorrect (/32). Answer is D.
Totally agree, the answer correct is D