Home » Juniper » JN0-662 » Which type of network layer reachability information is used for the MP-BGP signaling between CE and PE routers?
In a carrier-of-carrier VPN model, which type of network layer reachability information is used for the MP-BGP signaling between CE and PE routers?
A. flow
B. labeled-unicast
C. unicast
D. inet-vpn
Correct Answer: D
Explanation/Reference:
Explanation/Reference:
In a Carrier-of-Carrier VPN environment, specify the inet-vpn address family and unicast traffic type to enable BGP to carry IPv4 network layer reachability information (NLRI) for VPN routes.
References: http://www.juniper.net/documentation/en_US/junosl 5.1/topics/example/mpls-vpn-option2-configuration.html
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https://www.juniper.net/documentation/en_US/junos/topics/topic-map/l3-vpns-carrier-carrier.html#id-configuring-carrier-of-carriers-vpns-for-customers-that-provide-internet-service
Should be B
The question asks “Which type of NLRI is used for “MP-BGP” signalling in a Carrier of Carrier “VPN” Model. The answer should be D:
On routers only, to enable MP-BGP to carry Layer 3 virtual private network (VPN) NLRI for the IPv4 address family, include the family inet-vpn statement:
https://www.juniper.net/documentation/en_US/junos/topics/topic-map/multiprotocol-bgp.html
Correct answer is – D
https://www.juniper.net/documentation/en_US/junos/topics/topic-map/l3-vpns-interprovider.html#jd0e5839
B:
The customer’s CE router (or switch) must be able to send labels to the VPN service provider’s router. Enable this by including the labeled-unicast statement in the configuration for the BGP group:
bgp {
group group-name {
export internal;
peer-as as-number;
neighbor address {
family inet {
labeled-unicast;
}
}
}
}
https://www.juniper.net/documentation/en_US/junos/topics/topic-map/l3-vpns-carrier-carrier.html#id-11830698
Agree B is correct
B
To configure Layer 3 VPN service with the customer’s CE router or switch, include the labeled-unicast statement in the configuration for the routing instance so the PE router (or switch) can send labels to the customer’s CE router or switch
https://www.juniper.net/documentation/en_US/junos/topics/usage-guidelines/vpns-configuring-carrier-of-carriers-vpns-for-customers-that-provide-internet-service.html#id-11891459