When implementing LDP, what is liberal label retention mode?
A.
To reduce the convergence time, the LSR will retain all the received labels in its LIB even if all the
neighbor LSRs go down temporary
B.
The LSR can assign it’s own label for each destination network even though it has not been
assigned a next hop label from the neighbor LSR
C.
The LSR will store the label received from the downstream LSRs in its LIB even if the downstream
LSRs are not the next hop for the destination
D.
The LSR will not perform PHP if it is operating in liberal label retention mode
Explanation:
By default, LDP accepts labels (as remote bindings) for all prefixes from all peers. LDP operates in
liberal label retention mode, which instructs LDP to keep remote bindings from all peers for a given
prefix. For security reasons, or to conserve memory, you can override this behavior by configuring
label binding acceptance for set of prefixes from a given peer.
The ability to filter remote bindings for a defined set of prefixes is also referred to as LDP inbound
label filtering