The Cisco IOS XR address-family ipv4 labeled-unicast and the Cisco IOS/IOS XE neighbor
send-label commands are used in which MPLS implementation?
A. Cisco MPLS TE
B. CSC using MP-BGP for label exchange
C. back-to-back VRF
The MPLS VPNCarrier Supporting CarrierIPv4 BGP Label Distribution feature lets you
configure your carrier-supporting-carrier network to enable Border Gateway Protocol (BGP)
to transport routes and Multiprotocol Label Switching (MPLS) labels between the backbone
carrier provider edge (PE) routers and the customer carrier customer edge (CE) routers
using multiple paths. Previously, you had to use Label Distribution Protocol (LDP) to carry
the labels and an Internal Gateway Protocol (IGP) to carry the routes between PE and CE
routers to achieve the same goal.
The benefits of using BGP to distribute IPv4 routes and MPLS label routes are:
BGP takes the place of an IGP and LDP in a Virtual Private Network (VPN)
forwarding/routing instance (VRF) table. You can use BGP to distribute routes and MPLS
labels. Using a single protocol instead of two simplifies the configuration and
BGP is the preferred routing protocol for connecting two Internet service providers (ISPs),
mainly because of its routing policies and ability to scale. ISPs commonly use BGP
between two providers.
This feature enables those ISPs to use BGP.
In hierarchical VPLS implementations, which two access architectures can be used
between the UPE and NPE? (Choose two.)
C. Frame Relay
H-VPLS uses spoke connections, usually between Layer 2 switches acting as the CE and
PE devices at the service provider's point-of presence (POP). The spoke connections can
be either an IEEE 802.1Q tagged connection or an MPLS LSP.
When implementing MPLS Layer 3 VPN services, which CE-PE routing method does not
require the use of the redistribute command to enable the customer routes to be advertised
through the MPLS cloud between the customer sites?