Do I have to configure PVC groups for both ends of an FR link at the same time

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No. A permanent virtual circuit (PVC) group is used to classify and send packets based on different priorities. You can configure a PVC group on one end, or simultaneously configure PVC groups on both ends.

Other related questions:
Do I have to configure PVCs for interfaces on the DCE or DTE side of an FR link
You must configure a permanent virtual circuit (PVC) for the interface on the data circuit-terminating equipment (DCE) side. Otherwise, the device cannot be pinged. You can configure a PVC for the interface on the data terminal equipment (DTE) side as required. If you configure a PVC for the interface on the DTE side, ensure that the data link connection identifier (DLCI) is the same as that on the DCE side.

Do the IP addresses of the two ends of an FR link have to be on the same network segment
If the devices on both ends are AR series routers, the IP addresses do not need to be on the same network segment.

Why is the PVC group always in inactive state after I configure the PVC group on an FR interface
You must configure permanent virtual circuits (PVCs) for the PVC group. Each IP packet priority must be assigned to a PVC. For details, see Configuring IPoFR Through a Single Link in the Configuration Guide - WAN.

Whether the two ends of a WDM link must have the same service type
Yes, the two ends of a WDM link must have the same service type.

Do I have to ensure that interfaces on the two ends of the link are on the same segment and have the same masks during the establishment of the OSPF neighbor relationship
The interfaces on the broadcast network, Non-Broadcast Multi-Access (NBMA) network, and point-to-multipoint (P2MP) network must be on the same network segment and the mask digits on the neighboring interfaces must be consistent. The point-to-point (P2P) network does not have this restriction.

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