350-501 Architecture Practice Question
Exhibit
Refer to the exhibit.
PE1#show ip bgp vpnv4 vrf Customer-A 10.10.10.0/24
BGP routing table entry for 10.10.10.0/24, version 6
Paths: (2 available, best #2, table Customer-A)
Advertised to update-groups:
1
Refresh Epoch 2
Local
65000 65001
10.1.1.1 (metric 20) from 10.1.1.1 (192.168.1.1)
Origin IGP, metric 0, localpref 100, valid, internal, best
Extended Community: RT:100:100
mpls labels in/out vpn-label:24000
rx pathid: 0, tx pathid: 0x0
Path #2: (not installed because of route-target mismatch?)
Not advertised to any peer
PE1#show run | section vrf Customer-A
vrf Customer-A
rd 100:1
route-target export 100:100
route-target import 200:200
!Based on the exhibit, why is the route 10.10.10.0/24 from remote PE not installed in the VRF Customer-A on PE1?
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 VRF imports route-target 200:200, but the route has RT 100:100
The route has RT 100:100, but VRF Customer-A imports RT 200:200. Thus, the route is not imported. Option A is wrong because the localpref is 100, which is default and not an issue. Option C is wrong because the RD mismatch is between VRFs, but RD does not affect import; RT does. Option D is wrong because label allocation is working fine (vpn-label:24000).
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 localpref is too low (100)
Why it's wrong here
Localpref of 100 is default and fine.
- ✓
The VRF imports route-target 200:200, but the route has RT 100:100
Why this is correct
Route-target import filter must match the route's RT for installation.
- ✗
The MPLS label allocation failed on the remote PE
Why it's wrong here
Label 24000 is present, so allocation succeeded.
- ✗
The route distinguisher on the VRF (100:1) does not match the remote RD
Why it's wrong here
RD does not need to match; only RT matters for import.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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