350-501 Architecture Practice Question
Exhibit
Refer to the exhibit. router bgp 65000 bgp router-id 10.0.0.1 neighbor 10.0.0.2 remote-as 65000 neighbor 10.0.0.2 update-source Loopback0 neighbor 10.0.0.2 route-reflector-client address-family vpnv4 neighbor 10.0.0.2 activate neighbor 10.0.0.3 remote-as 65000 neighbor 10.0.0.3 update-source Loopback0 neighbor 10.0.0.3 route-reflector-client address-family vpnv4 neighbor 10.0.0.3 activate ! address-family ipv4 vrf CustomerA redistribute connected
Refer to the exhibit. The router is configured as a route reflector for VPNv4. What is the requirement for the route reflector to propagate VPNv4 routes received from a client to other clients?
⚠ Common exam trap
Cisco often tests the misconception that route reflectors must modify the next-hop or filter based on route-targets, but the key loop-prevention mechanism for client-to-client reflection is the originator ID attribute, not cluster ID or next-hop manipulation.
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 route reflector must include the originator ID attribute to prevent loops
The route reflector must include the originator ID attribute to prevent routing loops when reflecting VPNv4 routes between clients. The originator ID is set to the router ID of the originating IBGP speaker, and the route reflector ignores any route with an originator ID equal to its own router ID, thereby preventing loops in a client-to-client reflection scenario.
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 route reflector must filter routes based on route-target communities
Why it's wrong here
RT filtering is done on the PE, not on the route reflector.
- ✗
The route reflector must use the same cluster ID for all clients
Why it's wrong here
Cluster ID is used for loop prevention, but originator ID is also needed.
- ✓
The route reflector must include the originator ID attribute to prevent loops
Why this is correct
The originator ID identifies the original advertiser; the route reflector must not modify it.
- ✗
The route reflector must set the next-hop to itself for all reflected routes
Why it's wrong here
Next-hop is typically unchanged unless explicit policy is applied.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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