350-501 Architecture Practice Question
Exhibit
show mpls ldp neighbor 10.0.0.1 detail
Peer LDP Ident: 10.0.0.1:0; Local LDP Ident: 10.0.0.2:0
TCP connection: 10.0.0.1.646 - 10.0.0.2.42653
State: Oper; Msgs sent/rcvd: 100/105; Downstream
Up time: 00:10:00
Label bindings: noneRefer to the exhibit. Based on the exhibit, what is the most likely reason for no label bindings?
⚠ Common exam trap
Cisco often tests the distinction between LDP session establishment and actual label advertisement. Candidates may mistakenly attribute missing label bindings to local IGP routes or LDP session issues, but the root cause can be label filtering applied on the remote peer, which prevents the advertisement of labels altogether.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The remote peer has label filtering applied
The exhibit shows that the local router has not received any label bindings from the remote peer (as evidenced by the empty 'show mpls ldp bindings' output), which indicates that the remote peer is not advertising labels. This is typically due to an outbound label filtering policy applied on the remote peer, such as 'mpls ldp neighbor [neighbor-id] label-filter' or 'mpls ldp label-filter' that rejects label advertisements to the local router. The local router's LDP session may be established (based on 'show mpls ldp neighbor'), but the remote peer is actively preventing label distribution.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The local router has disabled label advertisements
Why it's wrong here
If local disabled, the session might not be operational, or at least no labels sent, but could still receive? Not typical.
- ✗
The IGP routes are not present in the routing table
Why it's wrong here
IGP routes are needed for label binding, but absence would affect local labels, not remote bindings.
- ✗
The LDP session is not fully established
Why it's wrong here
The state is Oper, so session is fully established.
- ✓
The remote peer has label filtering applied
Why this is correct
Label filtering on the remote peer can prevent advertisement of labels.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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