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| Section | Weight | Objectives |
|---|---|---|
| Layer 3 VPNs | 35% | - Describe CSC concepts - Implement extranet/shared services (route targets/policy) - Describe Inter-AS L3VPNs (Options A, B, AB, C) - Implement multicast VPN (Intranet, Extranet, mLDP) - Describe routing requirements (MP-BGP, PE-CE routing) - Troubleshoot Intra-AS L3VPNs (PE-CE, PE-PE, PE-RR) |
| VPN Architecture | 25% | - 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) - 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) |
| Layer 2 VPNs | 30% | - Describe EVPN concepts (data plane/control plane, multihoming, suppression, forwarding) - Troubleshoot L2VPN services (E-LAN, E-Line, E-Tree) - Implement EVPN (IRB, VPWS, native) - Implement Ethernet OAM |
| IPv6 VPNs | 10% | - Describe IPv6 VPN routing requirements (MP-BGP, PE-CE) - Troubleshoot IPv6 VPN provider edge (PE-PE, PE-CE) |
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NEW QUESTION # 91
An engineer is investigating an EVPN traffic flow issue. Which type of traffic should the engineer allow in an EVPN Tree Service in order to fix this issue?
Answer: C
Explanation:
Reference:
https://tools.ietf.org/html/draft-ietf-bess-evpn-etree-14
NEW QUESTION # 92
An engineer needs to improve MPLS network management by implementing a set of tools to support the NOC engineers in troubleshooting network failures. Which feature should the engineer implement to check the connectivity of the MPLS LSP between the ingress and egress PE routers?
Answer: D
NEW QUESTION # 93
Refer to the exhibit. An organization is running H-VPLS on a network comprising four routers in a hub-and-spoke topology with R1 as the hub.
An engineer added a new spoke with multiple VCs to the network, and now traffic cannot flow properly.
How should the engineer update the configuration on R1 to correct the problem?
Answer: D
NEW QUESTION # 94
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 # 95
Refer to the exhibit. PE1 and PE2 are exchanging VPNv4 routes for CE1 and CE2, and PE3 contains the default route to the internet. If the three devices are operating normally, which two conclusions describe this configuration? (Choose two.)
Answer: A,B
NEW QUESTION # 96
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