350-501 · Question #243
Refer to the exhibit. A network operator working for a telecommunication company with an employee 3994:37:650 is implementing a cisco Unified MPLS solution. What is the effect of this implementation?
The correct answer is D. BGP is deployed between the PEs and ABRs with RFC 3107.. In a Cisco Unified MPLS solution, BGP is deployed between Provider Edge (PE) routers and Area Border Routers (ABRs) to distribute VPN routes and their associated MPLS labels, leveraging RFC 3107 for carrying label information in BGP-4.
Question
Refer to the exhibit. A network operator working for a telecommunication company with an employee 3994:37:650 is implementing a cisco Unified MPLS solution. What is the effect of this implementation?
Exhibit
Options
- AEIGRP is deployed between the PEs and ABRs with RFC 3107.
- BOSPF is deployed between the PEs and ABRs with RFC 3107.
- CIS-IS is deployed between the PEs and ABRs with RFC 3107.
- DBGP is deployed between the PEs and ABRs with RFC 3107.
How the community answered
(22 responses)- A5% (1)
- B9% (2)
- C5% (1)
- D82% (18)
Why each option
In a Cisco Unified MPLS solution, BGP is deployed between Provider Edge (PE) routers and Area Border Routers (ABRs) to distribute VPN routes and their associated MPLS labels, leveraging RFC 3107 for carrying label information in BGP-4.
EIGRP is an Interior Gateway Protocol (IGP) used for IP reachability within a single routing domain and does not use RFC 3107 to carry MPLS label information for VPN services between PEs and ABRs.
OSPF is an Interior Gateway Protocol (IGP) used for IP reachability within a single routing domain and does not use RFC 3107 to carry MPLS label information for VPN services between PEs and ABRs.
IS-IS is an Interior Gateway Protocol (IGP) used for IP reachability within a single routing domain and does not use RFC 3107 to carry MPLS label information for VPN services between PEs and ABRs.
RFC 3107 specifies how BGP carries label information, a critical aspect of MPLS VPNs. In a Cisco Unified MPLS architecture, BGP is extensively used between PE routers, often involving ABRs as route reflectors or inter-AS connection points, to distribute labeled VPNv4 routes for scalable end-to-end VPN connectivity.
Concept tested: Unified MPLS architecture and BGP label distribution (RFC 3107)
Source: https://www.cisco.com/c/en/us/td/docs/ios/mpls/configuration/guide/mp_unified_mpls_psg_cg.html
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