Which Cisco IOS XR configuration creates an L2VPN using BGP as auto discovery and LDP as signaling?
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A. B. C. D.A.
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Sure, I'd be happy to help you with this question!
First, let's understand what L2 VPN means. L2 VPN or Layer 2 Virtual Private Network is a technology that allows service providers to extend Layer 2 connectivity between different sites over an IP/MPLS network.
Now, let's look at the configuration options given in the question and try to understand them:
Option A:
pythonl2vpn bridge group bg1 bridge-domain bg1_bd1 interface GigabitEthernet0/6/0/1.1 ! Virtual Forwarding Instance configuration for the L2 VPN vfi bg1_db1_vfivpn-id 101 autodiscovery bgp rd 101:1 route-target both 101:1 signaling-protocol ldp ve-id 1:101 In this option, the L2 VPN is created using BGP as auto-discovery protocol and LDP as the signaling protocol. The virtual forwarding instance (VFI) is named bg1_db1_vfivpn-id 101, which represents the L2 VPN. The autodiscovery bgp command enables the auto-discovery of the remote PE routers using BGP, while the signaling-protocol ldp command specifies LDP as the signaling protocol. The route distinguisher (RD) is set to 101:1, and the route target (RT) is set to 101:1. Finally, the virtual Ethernet identifier (VE ID) is set to 1:101.
Option B:
pythonl2vpn bridge group bg1 bridge-domain bg1_bd1 interface GigabitEthernet0/6/0/1.123 ! Virtual Forwarding Instance configuration for the L2 VPN vfi bg1_db1_vfivpn-id 123 autodiscovery bgp rd 123:3 route-target both 123:3 signaling-protocol bgp ve-id 3 In this option, the L2 VPN is also created using BGP as the auto-discovery protocol and BGP as the signaling protocol. The virtual forwarding instance (VFI) is named bg1_db1_vfivpn-id 123, which represents the L2 VPN. The autodiscovery bgp command enables the auto-discovery of the remote PE routers using BGP, while the signaling-protocol bgp command specifies BGP as the signaling protocol. The route distinguisher (RD) is set to 123:3, and the route target (RT) is set to 123:3. Finally, the virtual Ethernet identifier (VE ID) is set to 3.
Option C:
vbnetl2vpn bridge group bg1 bridge-domain bg1_bd1 interface GigabitEthernet0/6/0/1.1 ! Virtual Forwarding Instance configuration for the L2 VPN vfi bg1_db1_vfivpn-id 111 autodiscovery bgp rd auto route-target both 111:1 signaling-protocol bgp ve-id 3 In this option, the L2 VPN is created using BGP as the auto-discovery protocol and BGP as the signaling protocol. The virtual forwarding instance (VFI) is named bg1_db1_vfivpn-id 111, which represents the L2 VPN. The autodiscovery bgp command enables the auto-discovery of the remote PE routers using BGP, while the 'signaling