【多选题】
A 1) 正确于桥接点，一般部署L3到L2的联动。当桥接点上行L3隧道所在光路中断时，断掉L2VPN所在线卡的N侧端口，使PW发生倒换。 For the bridging node, we usually deploy L3-to-L2 linkage. When the optical path where uplink L3 tunnel of the bridging node locates gets interrupted, disconnect N-side port of the line card where L2VPN locates to make PW to switch.
B 2) 桥接点落地分离场景，需要部署L3N到U的联动，当落地点下行L3隧道所在光路中断时，断掉IPFRR主用路由所在端口，使远端ipfrr倒换。 In the scenario where the bridging device and the landing device are independent of each other, it is necessary to deploy L3 N-to-U linkage. When the optical fiber where the downlink L3 tunnel of the landing device passes through is interrupted, the landing device disables the port associated with IP FRR master route, making the peer-end device to go through IP FRR switching.
C 3) 桥接点落地分离场景，需要部署L3U到N的联动，当IPFRR主备路由所在端口down时，让L3VPN的N侧隧道产生loc，触发vpn-VPN倒换。 In the scenario where the bridging device and the landing device are independent of each other, it is necessary to deploy L3 U-to-N linkage. When the port where IPFRR master/slave routes locate is down, make N side tunnel of L3VPN to generate loc to trigger vpn-VPN switching.
D 4) 为了防止主桥接点上L2VPN所在n侧端口故障，下行vpnfrr不倒换，导致业务中断，也需要在桥接点上部署L2到L3的联动。 When N-side port on master bridge point where L2VPN locates goes faulty, the downlink vpnfrr may not switch, so the services get interrupted. Therefore, it is necessary to deploy L2-to-L3 linkage on the bridge point.
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