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H12-821_V1.0 · Question #738

In the liberal distribution mode, if the Liberal retention mode is used, the device will retain the labels sent by all LDP Peers, regardless of whether the LDP Peer is the next hop to the…

The correct answer is A. TRUE. Option A is correct because Liberal Label Retention (LLR) is specifically designed to store ALL labels received from ANY LDP peer, not just the ones that are currently the next-hop router for a given destination. This approach trades memory (more labels stored) for speed - when…

MPLS and MPLS VPN

Question

In the liberal distribution mode, if the Liberal retention mode is used, the device will retain the labels sent by all LDP Peers, regardless of whether the LDP Peer is the next hop to the destination network segment.

Options

  • ATRUE
  • BFALSE

How the community answered

(29 responses)
  • A
    79% (23)
  • B
    21% (6)

Explanation

Option A is correct because Liberal Label Retention (LLR) is specifically designed to store ALL labels received from ANY LDP peer, not just the ones that are currently the next-hop router for a given destination. This approach trades memory (more labels stored) for speed - when routing changes occur and a neighbor becomes the new next hop, the device already has that label cached and can immediately switch without waiting for a new label advertisement.

Option B (FALSE) is wrong because it would imply the device only retains labels from next-hop peers, which describes Conservative Label Retention mode, not Liberal mode - the two are opposites.

Memory tip: Think of "Liberal" as "generous storage" - a liberal person keeps everything from everyone, just in case. A "Conservative" person only keeps what they currently need (labels from current next-hop peers only). Liberal = more RAM used, faster failover; Conservative = less RAM used, slower failover.

Topics

#MPLS LDP#label retention modes#liberal retention#label distribution

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