cisco ospf neighbor commands - What Does the show ip ospf...

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What Does the show ip ospf interface Command Reveal? Document ID: 13689 Author: Syed Faraz Shamim Introduction Prerequisites Requirements Components Used Conventions Example Interface Data Structure Interface State IP Address and Area Process ID Router ID Network Type Cost Transmit Delay State Priority Designated Router Interface Address Backup Designated Router Interface Address Timer Intervals Neighbor Count Adjacent Neighbor Count Suppress Hello Index Flood Queue Length Next Last Flood Scan Length/Maximum Last Flood Scan Time/Maximum NetPro Discussion Forums - Featured Conversations Related Information Introduction This document explains the information contained in the show ip ospf interface command output. Prerequisites Requirements Readers of this document should have basic knowledge of the Open Shortest Path First (OSPF) routing protocol.
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Components Used This document is not restricted to specific software and hardware versions. Conventions For more information on document conventions, refer to the Cisco Technical Tips Conventions. Example Interface Data Structure This diagram with an Ethernet interface serves as an example. Note: Depending on the type of interface, the contents of the data structure vary. Click on this image to open it in a new window: Router1# show ip ospf interface ethernet 0 Ethernet0 is up, line protocol is up Internet Address 10.10.10.1/24, Area 0 Process ID 1, Router ID 192.168.45.1, Network Type BROADCAST, Cost: 10 Transmit Delay is 1 sec, State BDR, Priority 1 Designated Router (ID) 172.16.10.1, Interface address 10.10.10.2 Backup Designated router (ID) 192.168.45.1, Interface address 10.10.10.1 Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5 Hello due in 00:00:06 Index 1/1, flood queue length 0 Next 0x0(0)/0x0(0) Last flood scan length is 2, maximum is 2 Last flood scan time is 0 msec, maximum is 4 msec Neighbor Count is 1, Adjacent neighbor count is 1 Adjacent with neighbor 172.16.10.1 (Designated Router) Suppress hello for 0 neighbor(s) Interface State The first line of the output shows the Layer 1 and Layer 2 states of the interface. In this example, the interface Ethernet0 senses the carrier on line and shows Layer 1 as up . Line protocol on the Ethernet0 interface confirms that Layer 2 is up . For proper functioning, the interfaces should be in an up/up state.
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IP Address and Area The second line shows the IP address configured on this interface and the area in which this interface is placed. In the above example, the Ethernet0 has an IP address of 10.10.10.1/24 and is in OSPF area 0.
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