Which OSPF interfaces require peers

1

You must configure peers on interfaces in the open shortest path first (OSPF) view, if the link type of the network is Non-Broadcast Multi-Access (NBMA).

Other related questions:
Which networks are the IS-IS and OSPF deployed on
The Intermediate System to Intermediate System routing protocol (IS-IS) is deployed on backbone networks. The open shortest path first (OSPF) is deployed on metropolitan area networks (MANs).

Problem and solution when the OSPF status is abnormal
To solve the problem that the OSPF status between the firewall and the peer device cannot reach the Full state, perform the following steps: 1. Check the OSPF status. Check whether the OSPF neighboring relationship can be established between the firewall and the peer device. 2. If no, check the security policy configuration. Check whether the security policy control function for unicast packets is enabled. That is, check whether the firewall packet-filter basic-protocol enable command is configured. If yes, run the undo firewall packet-filter basic-protocol enable command to disable the function. To establish an OSPF neighboring relationship, devices need to exchange DD packets. DD packets are OSPF unicast packets. By default, the forwarding of OSPF unicast packets is not controlled by security policies. However, if you run the firewall packet-filter basic-protocol enable command to enable the security policy control function for OSPF unicast packets, you need also to configure the corresponding security policy to allow the packets to be forwarded. For details, see OSPF can not step into full state caused by security policy deny.

Which licenses are required by the U1981?
Common licenses for the U1900 series voice gateway include the user port license, local regeneration license, voice conference license, and voicemail license. The licenses required onsite depend on services. For the detailed SBOM items and application guide, see the eSpace U1900 V200R003 License Application Guide (for SDP) at:

The state of an E1 interface is not Up when the interface interconnects with the peer device
For the problem that the state of an E1 interface of an AR router is not Up when the interface interconnects with other devices, see the troubleshooting guide. For details, access the URL in the right column.

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