Click the Exhibit button.
As a network administrator, you are asked to configure the VPN-B routing instance so that P routers are
masked in CE2-to-CE5 trace routes. For the VPN-A routing instance, P routers should appear in CE1-to-CE4
trace routes.
Referring to the exhibit, which two actions achieve this task? (Choose two.)
A.
Add the no-vrf-propagate-ttl statement to the VPN-B routing instance on PE1.
B.
Add the no-vrf-propagate-ttl statement on egress router PE2.
C.
Add the no-vrf-propagate-ttl statement on transit router P.
D.
Add the no-vrf-propagate-ttl statement to the VPN-B routing instance on PE2.
Explanation:
You do not need to include the no-vrf-propagate-ttl statement on the egress router (PE2).
Junos OS, Layer 3 VPNs Configuration Guide, page 208
When you change the TTL propagation behavior, old next hops for VRF routes are deleted from the inet.3 routing table and new next hops are added.
You need only configure the vrf-propagate-ttl or no-vrf-propagate-ttl statement on the ingress routers.
set routing-instances VPN-A no-vrf-propagate-ttl
https://www.juniper.net/documentation/en_US/junos/topics/example/vpns-vrf-ttl-decrement-disable.html
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correct – A and D
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https://www.juniper.net/documentation/en_US/junos/topics/example/vpns-vrf-ttl-decrement-disable.html
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Ans : A & D
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why on the P router? Who are configured routing-instances on P routers?
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Not on the P router, only on the PEs. The commando should be only n the Ingress, but depending on the traffic flow, meaning where the ping is originated, both PEs will be Ingress and Egress
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Figure 1 shows the topology used in this example. Router PE1 and Router PE2 have two VPNs—VPN-A and VPN-B. Devices CE1 and CE4 belong to VPN-A. Devices CE2 and CE5 belong to VPN-B. In this example, Router PE1 has TTL propagation disabled on VPN-A but not on VPN-B. Packets received by PE1 on the interface connected to CE1 have TTL propagation disabled. This example shows the configuration on Router PE1. You do not need to include the no-vrf-propagate-ttl statement on the egress router (PE2).
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https://www.juniper.net/documentation/en_US/junos/topics/example/vpns-vrf-ttl-decrement-disable.html
The needs two answers in this question is very stupid.
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