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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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