Cisco IOS XR Configuration for L2VPN with BGP Auto Discovery and LDP Signaling

Configuring L2VPN with BGP Auto Discovery and LDP Signaling using Cisco IOS XR

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Question

Which Cisco IOS XR configuration creates an L2VPN using BGP as auto discovery and LDP as signaling?

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Explanations

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A. B. C. D.

A.

References:

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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:

python
l2vpn  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:

python
l2vpn  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:

vbnet
l2vpn  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

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