350-501 Services Practice Question
A service provider is configuring BGP community propagation in an MPLS VPN network. Which two actions are necessary to ensure that communities are passed from CE to remote PE?
⚠ Common exam trap
Cisco often tests the distinction between standard and extended communities, leading candidates to forget that `send-community` (for standard) is required on the CE-PE session, while `send-community extended` is only for VPNv4 peers.
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
✓
Configure send-community on the CE-to-PE BGP session
B is correct because the `send-community` command must be configured on the CE-to-PE BGP session to allow standard BGP communities (e.g., NO_EXPORT) to be propagated from the CE router into the MPLS VPN network. Without this, the PE router will strip communities from incoming BGP updates, preventing them from reaching the remote PE.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Configure no bgp default community-mode
Why it's wrong here
Incorrect. This is not a valid Cisco command.
- ✓
Configure send-community on the CE-to-PE BGP session
Why this is correct
Correct. This allows communities from the CE to be received by the PE.
- ✓
Configure send-community extended on the VPNv4 neighbor
Why this is correct
Correct. This enables community propagation across the MPLS VPN core.
- ✗
Configure vrf forwarding with route-target both
Why it's wrong here
Incorrect. Route-target is for MPLS VPN route import/export, not for community propagation.
- ✗
Configure route-map to filter communities
Why it's wrong here
Incorrect. A route-map is optional for filtering, not necessary for propagation.
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Senior Network & Security Engineer · founder of Courseiva
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