As far as I know, in Cisco implementation of LDP ,all IGP routes will be imported to the LDP database ,and the same will be advertised to the LDP neighbours by default. If I have a requirement that only loopbacks are needed to be advertised to the LDP neighbours thruout ,how can I configure a policy for the same .
the feature you are looking for is called "conditional advertisement". You can define the networks LDP should advertise a label for with an access-list and also optionally the LDP peers through an access-list. An example config looks like this:
no mpls ldp advertise-tags
mpls ldp advertise-tags for 100 to 11
access-list 100 permit ip 192.168.1.0 0.0.0.255 host 255.255.255.255
access-list 11 permit host 10.1.1.1
access-list 11 permit host 10.1.1.2
access-list 11 permit host 10.3.4.5
where f.e. host routes from 192.168.1.0/24 are your loopbacks and there are three peers 10.x.x.x.
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