Answer is B, https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_te_path_setup/configuration/xe-16-12/mp-te-path-setup-xe-17-book/mpls-traffic-engineering-and-enhancements.html
The MPLS traffic engineering feature does not support routing and signaling of LSPs over unnumbered IP links. Therefore, do not configure the feature over those links.
I found evidence to the contrary here: https://www.networkworld.com/article/2281049/chapter-4--cisco-mpls-traffic-engineering.html#:~:text=Example%204%2D5%20Definition%20of%20a%20TE%20LSP%20Headend%20in%20Cisco%20IOS Not saying B isn't correct but thought I would mention this. Wonder if ios-xe is different than the IOS shown in this article. Always confusing though :P
QoS argument is flawed imo, DS-TE is an extension to MPLS-TE to allow that. Meaning it is no longer a constraint. Even configured under the MPLS Traffic engineering commands, be like saying MPLS-TE can't dynamically create paths because it relies on an IGP.
However the link posted by another user:
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_te_path_setup/configuration/xe-16-12/mp-te-path-setup-xe-17-book/mpls-traffic-engineering-and-enhancements.html
Clearly states that unnumbed links are not supported. XE 17 being a current firmware as well, so not outdated. Also to the user that rebuttaled that, unnumbered link is not the same thing as unnumbed loopback. Even in the documentation linked, the examples have unnumbered loopbacks.
I found it , it's B
The MPLS traffic engineering feature does not support routing and signaling of LSPs over unnumbered IP links. Therefore, do not configure the feature over those links.
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_te_path_setup/configuration/xe-3s/mp-te-path-setup-xe-3s-book/mp-te-enhance-xe.html#GUID-96C9B528-9D61-4E5E-83EE-3BA1631A34CB
For each ABR that is running OSPF, perform the following steps to configure traffic engineering on each area you want tunnels in or across. By having multiple areas and configuring traffic engineering in and across each area, the router can contain changes within the network within an area.
I was thinking the same but see here, https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_te_path_setup/configuration/xe-16-7/mp-te-path-setup-xe-16-7-book/mpls-traffic-engineering-interarea-tunnels.html
A should be correct answer. You need MPLS DS-TE.
MPLS traffic engineering allows constraint-based routing (CBR) of IP traffic. One of the constraints satisfied by CBR is the availability of required bandwidth over a selected path. DiffServ-aware Traffic Engineering extends MPLS traffic engineering to enable you to perform constraint-based routing of "guaranteed" traffic, which satisfies a more restrictive bandwidth constraint than that satisfied by CBR for regular traffic.
https://www.cisco.com/c/en/us/td/docs/ios/12_2sr/12_2srb/feature/guide/dsteietf.html#wp1053951
The constraints of MPLS TE Tunnel is not supporting Qos aware, DS-TE does support Qos aware Tunneling.
The correct answer is A
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