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

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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.

Other related questions:
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.

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.

Must two S series switches be on the same network segment to set up an OSPF neighbor relationship
Question: Must the interfaces on two ends of an OSPF link be on the same network segment and the mask digits on the neighboring interfaces be consistent? Answer: When two S series switches are establishing an OSPF neighbor relationship, the interfaces on the broadcast network, NBMA network, or P2MP network must be on the same network segment and the mask digits on the neighboring interfaces must be consistent. The limitations do not apply to interfaces on a P2P network. On an OSPF P2P network, if the link-layer protocol is PPP, OSPF neighbors with IP addresses on different network segments can be in the Full state and correctly calculate routes. However, if the link-layer protocol is not PPP (for example, HDLC), devices with IP addresses on different network segments cannot establish an OSPF neighbor relationship. Through PPP negotiation, the local device can obtain the IP address of the remote device and have a route to the remote device without extra configuration.

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

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