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| Section | Weight | Objectives |
|---|---|---|
| VPN Architecture | 25% | - Compare VPN architecture (Layer 2 vs Layer 3, Inter-AS/Intra-AS) - Troubleshoot underlay (Core IGP, LSP) - Describe L3VPN data plane (underlay label, VRF forwarding, VPNv6) - Describe Layer 2 service architecture (IOS XR Ethernet Flowpoints, IOS XE EVCs) - Describe L3VPN control plane (MP-BGP, RD, RT, VPN labels, VRF, PE-CE) |
| IPv6 VPNs | 10% | - Describe IPv6 VPN routing requirements (MP-BGP, PE-CE) - Troubleshoot IPv6 VPN provider edge (PE-PE, PE-CE) |
| Layer 3 VPNs | 35% | - Describe Inter-AS L3VPNs (Options A, B, AB, C) - Describe CSC concepts - Troubleshoot Intra-AS L3VPNs (PE-CE, PE-PE, PE-RR) - Describe routing requirements (MP-BGP, PE-CE routing) - Implement extranet/shared services (route targets/policy) - Implement multicast VPN (Intranet, Extranet, mLDP) |
| Layer 2 VPNs | 30% | - Troubleshoot L2VPN services (E-LAN, E-Line, E-Tree) - Describe EVPN concepts (data plane/control plane, multihoming, suppression, forwarding) - Implement EVPN (IRB, VPWS, native) - Implement Ethernet OAM |
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NEW QUESTION # 34
An engineer is investigating an MPLS LDP issue. Which command should an engineer use on a Cisco IOS XE device to display the contents of the LFIB?
Answer: B
Explanation:
Reference:
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mpls/command/mp-cr-book/mp-s2.html
NEW QUESTION # 35
SIMULATION 7
Guidelines
This is a lab item in which tasks will be performed on virtual devices.
* Refer to the Tasks tab to view the tasks for this lab item.
* Refer to the Topology tab to access the device console(s) and perform the tasks.
* Console access is available for all required devices by clicking the device icon or using the tab(s) above the console window.
* All necessary pre-configurations have been applied.
* Do not remove any existing configurations from the devices, only those necessary to make the appropriate changes required to fulfill the listed tasks.
* Do not change the enable password or hostname for any device.
* Save your configurations to NVRAM before moving to the next item.
* Click Next at the bottom of the screen to submit this lab and move to the next question.
* When Next is clicked, the lab closes and cannot be reopened.
Topology
Tasks
CE1 and CE2 are IPv6 Customer Premise Equipment of two customers that communicate with each other through the MPLS L3VPN core comprising Provide Edge PE1, PE2, and route- reflector RR.
Perform the below configuration and verification tasks as noted.
1. Troubleshoot and modify the CEs to establish IPv6 BGP sessions with the PEs.
2. Troubleshoot and modify the PEs to receive the remote CE's advertised route in their BGP VRF table.
Initial configuration with IPv6 addressing has been completed. Do not change the configurations except to fulfill the abovementioned tasks. Apply the solution with the minimum configuration.
Answer:
Explanation:
1. On CE1 and CE2 - fix IPv6 eBGP toward the PE.
2. On PE1 and PE2 - activate the VRF IPv6 address-family and the CE neighbors so the PE learns the CE loopback prefixes in the VRF BGP table.
Configuration sketch
1. CEs - establish IPv6 BGP sessions with PEs
On CE1 (use the AS numbers and IPv6 addresses already present in the config):
ipv6 unicast-routing
router bgp <CE1-AS>
neighbor 172:1:2::PE1 remote-as <PE-AS>
!
address-family ipv6
neighbor 172:1:2::PE1 activate
network 192:1:1:1::1/128
exit-address-family
On CE2:
ipv6 unicast-routing
router bgp <CE2-AS>
neighbor 172:4:5::PE2 remote-as <PE-AS>
!
address-family ipv6
neighbor 172:4:5::PE2 activate
network 192:5:5:5::5/128
network 192:55:55:55::55/128
exit-address-family
If the neighbors already exist under router bgp, only the address-family ipv6 section and activate/network lines are needed.
2. PEs - ensure IPv6 VPNv6/VRF BGP is receiving the CE routes
On PE1, in the VRF used for CE1 (for example CUST-A):
router bgp <PE-AS>
address-family ipv6 vrf CUST-A
neighbor 172:1:2::CE1 activate
redistribute connected
exit-address-family
On PE2, in the same VRF:
router bgp <PE-AS>
address-family ipv6 vrf CUST-A
neighbor 172:4:5::CE2 activate
redistribute connected
exit-address-family
Verification (examples)
On CEs:
show bgp ipv6 unicast summary - eBGP session to the PE must be Established.
On PEs:
show bgp ipv6 vrf CUST-A - should list 192:1:1:1::1/128, 192:5:5:5::5/128 and
192:55:55:55::55/128.
From CE1:
ping ipv6 192:5:5:5::5 source 192:1:1:1::1 and
ping ipv6 192:55:55:55::55 source 192:1:1:1::1 should succeed.
The CE-PE links are IPv6 only, so BGP must use IPv6 neighbors and the IPv6 unicast address- family. Without activating the neighbors under the IPv6 address-family and advertising the loopback prefixes, the CE routers neither form IPv6 BGP sessions nor send their routes to the PEs.
On the PEs, the VRF for this customer must run the IPv6 VRF address-family and have the CE neighbors activated there. Only in that address-family are the CE IPv6 routes installed into the VRF BGP table. By also redistributing connected (or explicitly advertising the CE-connected prefixes), the PE injects the CE loopback routes into VPNv6 so that they are carried across the MPLS core and imported into the opposite PE's VRF, allowing full IPv6 reachability between the CE loopback addresses.
NEW QUESTION # 36
Refer to the exhibit. PE1 is located at a company's headquarters, with PE2 and PE3 at remote offices. A service provider implemented E-Tree for the company, with PE1 serving at the root and PE2 and PE3 serving as leaf nodes in the topology. For redundancy, PE3 offers some of the same services that that offered at headquarters. However, when the link to PE1 fails, users on PE2 cannot access the services on PE3. Which action must the engineer take to resolve the issue?
Answer: D
Explanation:
In an EVPN E-Tree, leaf nodes cannot communicate with other leaves-only with roots. With PE1 (root) down, PE2 (leaf) cannot reach services on PE3 (also leaf). Making PE3 a root node permits leaf-to-root forwarding and restores access when the PE1 link fails.
NEW QUESTION # 37
Refer to the exhibit. A Cisco engineer at a service provider must implement single-homed EVPN- VPWS. When router PE1 receives an EVPN per EVI EAD route from PE2, it must add the entry to its local Layer 2 RIB. The engineer began the implementation process by applying this configuration to PE1. Which additional configuration must the engineer apply to PE1 to complete the EVPN-VPWS implementation?
Answer: B
Explanation:
Single-homed EVPN-VPWS is configured under l2vpn xconnect p2p with an AC interface and a neighbor evpn statement that specifies the EVI and target/source AC IDs. Multihoming/ESI configuration is not required; thus the xconnect EVPN neighbor configuration in option B completes the implementation.
NEW QUESTION # 38
Which condition must be met before an environment can support CSC?
Answer: C
Explanation:
Section: Layer 3 VPNs
NEW QUESTION # 39
......
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