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CCNP Practice Question: Router bgp 65000 bgp router-id 10.0.0.1 neighbor…
router bgp 65000
bgp router-id 10.0.0.1
neighbor 10.0.0.2 remote-as 65001 neighbor 10.0.0.2 route-map SET_ORIGIN in
! route-map SET_ORIGIN permit 10 set origin incomplete ! What is the effect of this configuration?
⚠ Common exam trap
Cisco often tests the directionality of route-maps (in vs out) and the fact that origin can be modified with a route-map, leading candidates to mistakenly think the route-map applies to outbound updates or that origin is immutable.
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
✓
Routes received from 10.0.0.2 will have their origin set to incomplete, making them less preferred compared to IGP origin.
The route-map SET_ORIGIN is applied as an inbound filter to neighbor 10.0.0.2. When a route is received, the 'set origin incomplete' command changes the origin attribute to incomplete (value 2). In BGP path selection, origin incomplete is the least preferred origin type, making these routes less preferred than routes with IGP (value 0) or EGP (value 1) origin.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Routes received from 10.0.0.2 will have their origin set to incomplete, making them less preferred compared to IGP origin.
Why this is correct
A route-map applied in the inbound direction to neighbor 10.0.0.2 will process received BGP updates and modify their origin attribute to incomplete (value 2). Since origin is a well-known mandatory attribute considered during best-path selection, incomplete is less preferred than IGP (0) or EGP (1). This makes the route less attractive within BGP path selection.
- ✗
Routes sent to 10.0.0.2 will have their origin set to incomplete.
Why it's wrong here
The neighbor route-map with the 'in' keyword controls only updates arriving from 10.0.0.2, not updates sent to it. To alter the origin of routes being advertised to this peer, the route-map would need to be applied with the 'out' keyword. Thus, the router will not set origin to incomplete on eBGP or iBGP updates toward 10.0.0.2.
- ✗
The router will not advertise any routes with origin incomplete to other peers.
Why it's wrong here
Modifying origin to incomplete does not suppress advertisement of routes to other peers. BGP still advertises all valid, best routes according to its outbound policy; origin is just an attribute carried in the update. Without additional filtering such as a distribute-list or route-map that denies the prefix, the route will still be advertised to other neighbors.
- ✗
The configuration is invalid because origin cannot be changed with a route-map.
Why it's wrong here
BGP's route-map configuration supports the 'set origin' command, allowing manual assignment of igp, egp, or incomplete values. This is a standard feature and is not invalid. In fact, changing origin is a deliberate technique to influence how other routers rank a route without affecting other attributes like AS path or local preference.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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