You are tasked to enable LDP on many of the interfaces on the Cisco CRS-3 router, and because
there are many interfaces that need to have LDP enabled, you mistakenly did not enable LDP on
all the required interfaces. To prevent this issue from happening again in the future, what could
you do the next time you need to enable LDP on many interfaces?
A.
use the mpls ldp auto-config command under the IGP routing process
B.
use the mpls ldp sync command under the IGP routing process
C.
use the interface all command under the MPLS LDP process
D.
use the discovery command under the MPLS LDP process
Explanation:
http://www.cisco.com/c/en/us/td/docs/routers/xr12000/software/xr12k_r4-2/mpls/configuration/guide/b_mpls_cg42xr12k/b_mpls_cg42xr12k_chapter_01.html#con_1238965
IGP Auto-configuration
To enable LDP on a large number of interfaces, IGP auto-configuration lets you automatically configure LDP on all interfaces associated with a specified IGP interface; for example, when LDP is used for transport in the core network. However, there needs to be one IGP set up to enable LDP auto-configuration.
Typically, LDP assigns and advertises labels for IGP routes and must often be enabled on all active interfaces by an IGP. Without IGP auto-configuration, you must define the set of interfaces under LDP, a procedure that is time-intensive and error-prone.
0
0