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CCNP Practice Question: In Cisco SD-WAN, what is the maximum number of…
In Cisco SD-WAN, what is the maximum number of TLOCs that can be associated with a single OMP route?
⚠ Common exam trap
Cisco often tests the 8-TLOC limit to catch candidates who confuse OMP's TLOC-per-route limit with the 16-path limit common in BGP or with the default 4-path limit in some IGP protocols.
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
✓
8
In Cisco SD-WAN, a single OMP route can have up to 8 TLOCs (Transport Locations) associated with it. This limit is enforced by the OMP protocol to balance path diversity and control-plane scalability, ensuring that the vSmart controller does not advertise an excessive number of next-hop paths for a single prefix.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
8
Why this is correct
In Cisco SD-WAN, the OMP route's TLOC attribute is a fixed-size list that supports a maximum of 8 TLOCs. This allows up to 8 distinct paths for load balancing or failover per route. Adding more paths would require multiple OMP routes or policy-based path selection, but the protocol hard-codes the per-route limit.
- ✗
4
Why it's wrong here
Choosing 4 conflates a common deployment template (e.g., two WAN transports across two hubs) with a protocol limit. The OMP TLOC list is encoded to hold up to 8 entries, so 4 is an underestimation rather than a maximum. Some older SD-WAN documentation used examples with 4 TLOCs, but that is not an enforced cap.
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16
Why it's wrong here
Setting the maximum as 16 exceeds the OMP route's TLOC list size, which is defined as 8 entries in the protocol specification. The route's TLOC attribute uses a compact encoding that does not support 16; any attempt to inject more TLOCs would be invalid. This number might come from expanding past 8 via multiple OMP peers, but per-route limits do not stack.
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Unlimited
Why it's wrong here
SD-WAN does not permit an unbounded number of TLOCs per OMP route; a hard cap of 8 exists to ensure deterministic forwarding and to bound CPU and memory usage on controllers and routers. The forwarding table and BFD session tracking would become unmanageable with no limit. Thus 'unlimited' is false because the protocol enforces a concrete maximum.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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