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

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

Other related questions:
Must the IP addresses of interfaces on the two ends of a P2P link be on the same network segment
On an OSPF P2P network, if the link layer protocol is Point-to-Point Protocol (PPP) and different network segment addresses are configured on the interfaces on the two ends of the link, OSPF neighbors are in the Full state and forward traffic normally. If link layer protocol traffic is encapsulated over High-Level Data Link Control (HDLC) or another protocol, no neighbor relationship can be established. The difference in the OSPF neighbor relationship establishment with PPP and HDLC is that with PPP, the IP address of the peer can be negotiated. This allows the route to the peer to be obtained without additional operations. In addition, on an OSPF broadcast network, NBMA network, or P2MP network, the IP address of the neighbor and that of the local interface must be on the same network segment.

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.

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.

Must the IP addresses of the two peer ends on FR networks be in the same network segment
The IP addresses of two peer ends have no need to be configured in the same network segment if both ends are both AR routers.

CPU models requirements
A server must use the same model of CPUs. Otherwise, the server cannot run normally.

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