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Exam JN0-663 topic 1 question 58 discussion

Actual exam question from Juniper's JN0-663
Question #: 58
Topic #: 1
[All JN0-663 Questions]


You have a Layer 3 VPN established between PE-1 and PE-2 as well as between PE-1 and PE-3. You are using a route reflector (RR-1) to distribute VPN routes to your IBGP peers. You are asked to ensure that only relevant routes are sent from RR-1 to each of the PE routers.
Referring to the exhibit, which statement is correct?

  • A. You should use VRF export policies on RR-1 to control which routes are sent to each PE router.
  • B. You should use route target filtering only on RR-1 to control which routes are sent to each PE router.
  • C. You should use firewall filtering on RR-1 and all the PE devices to control which routes are sent to each PE router.
  • D. You should use route target filtering on RR-1 and all the PE devices to control which routes are sent to each PE router.
Show Suggested Answer Hide Answer
Suggested Answer: B 🗳️
by easynet at Sept. 1, 2021, 8:21 p.m.

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amart6936
Highly Voted 3 years, 5 months ago
D should be the correct answer since router target filtering needs to be configured on the RRs and the PEs requesting it.
upvoted 7 times
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mohdema
Most Recent 2 years, 4 months ago
Selected Answer: D
Normally, for the RT-Constrain feature to function properly, it must be broadly deployed throughout a network. If this is not the case, the feature is less useful, because the RT-Constrain BGP speaker facing a non-RT-Constrain speaker must advertise a default RT-Constrain route to the other RT-Constrain speakers on behalf of the peer that does not support the feature. This effectively removes the resource saving benefits of the feature in portions of the network where it is not supported since a default RT-Constrain route causes the PE router and all intervening PE routers to need to receive all VPN routes.
upvoted 1 times
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DIbyam
2 years, 6 months ago
route target filtering is configured on RR and respective PE to filter out unwanted routes in PE
upvoted 1 times
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jncie_examer
2 years, 6 months ago
Selected Answer: D
D is most correct. Configure the family on both sides of the BGP to enable this feature. I think B you can statically do it without BGP negotiation. But D is most correct to me.
upvoted 1 times
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Nikitas
3 years, 5 months ago
Answer D: https://www.juniper.net/documentation/us/en/software/junos/vpn-l3/topics/topic-map/l3-vpns-route-target-filtering.html#id-example-configuring-bgp-route-target-filtering-for-vpns
upvoted 4 times
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Anniesyed1234
3 years, 5 months ago
so is D the correct answer ?
upvoted 2 times
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Sct38
3 years, 7 months ago
Route Target needs to be configured on PE and RR... PE will advertise to RR required target: communities and RR will advertise 0/0 to request all VPN routes from PE.
upvoted 4 times
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Pgabusz
3 years, 7 months ago
I think the family route-target -filtering needs to be negotiated between the RR and PE's
upvoted 2 times
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easynet
3 years, 8 months ago
shouldn't you enable RT filtering on RR AND PE devices?
upvoted 2 times
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