350-501 EVI (Ethernet VPN Instance) Practice Question
When configuring EVPN VPWS, which TWO parameters must match between the two endpoints of the pseudowire?
⚠ Common exam trap
A common misconception is that ESI must match, but ESI identifies the local segment and can differ. The key matching parameters are EVI and Route-target.
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
✓
EVI (Ethernet VPN Instance)
In EVPN VPWS, two parameters must match between endpoints: the EVI (Ethernet VPN Instance) must match because it defines the EVPN instance and the Route Distinguisher. The Route-target must also match because it ensures that routes are imported/exported correctly between the endpoints. The ESI (Ethernet Segment Identifier) is local to each PE and does not need to match; it identifies the local segment for split-horizon and DF election purposes.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
EVI (Ethernet VPN Instance)
Why this is correct
Correct. The EVI must match between endpoints as it defines the EVPN instance.
- ✓
Route-target
Why this is correct
Correct. The Route-target must match to ensure proper route import/export.
- ✗
ESI (Ethernet Segment Identifier)
Why it's wrong here
Incorrect. ESI does not need to match; it identifies the local Ethernet segment and can differ.
- ✗
VLAN ID of the attachment circuit
Why it's wrong here
Incorrect. VLAN ID of the attachment circuit is local to each PE and does not need to match.
- ✗
IMET group address
Why it's wrong here
Incorrect. IMET group address is used for BUM traffic and does not need to match for pseudowire establishment.
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