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.
inet-vpn
B.
flow
C.
labeled-unicast
D.
unicast
Explanation:
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.
http://www.juniper.net/documentation/en_US/junos15.1/topics/example/mpls-vpn-option2-
configuration.html
I find this question tricky, I think it should be labeled-unicast.
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Agreed
C
https://www.juniper.net/documentation/en_US/junos/topics/usage-guidelines/vpns-configuring-carrier-of-carriers-vpns-for-customers-that-provide-vpn-service.html
Configuring BGP
In the BGP configuration for the carrier-of-carriers customer’s CE router (or switch), configure a group that includes the labeled-unicast statement to extend VPN service to the PE router (or switch)connected to the end customer’s CE router (or switch):
bgp {
group group-name {
type internal;
local-address address;
neighbor address {
family inet {
labeled-unicast;
}
}
}
}
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C correct
Include the labeled-unicast statement in the configuration for the IBGP session to the carrier-of-carriers customer’s CE router (or switch) ,
and include the family-inet-vpn statement in the configuration for the IBGP session to the carrier-of-carriers PE router (or switch) on the other side of the network
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yes C
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Option C, Final answer.
This technology is used with Interprovider Layer 3 VPN Option C, which provides interprovider multihop EBGP redistribution of labeled VPN-IPv4 routes between source and destination ASs, with EBGP redistribution of labeled IPv4 routes from AS to neighboring AS. Compared to Option A and Option B, Option C is the most scalable solution.
To configure an interprovider Layer 3 VPN option C service, you need to configure the AS border routers and the PE routers connected to the end customer’s CE routers using multihop EBGP to allow the PE routers to install routes.
For a PE router to install a route in the VRF, the next hop must resolve to a route stored within the inet.3 table. The labeled-unicast resolve-vpn statements allow labeled routes to be placed in the inet.3 routing table for route resolution, which are then resolved for PE router connections where the remote PE is located across another AS.
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