howtonetwork.net

Cisco Certification Training

  • Products
  • CCNA
    • CCNA Videos
    • CCNA Lectures
    • CCNA Practice Exams
    • Challenge Labs
      • Challenge Video Solutions
    • Cisco Commands
  • CCNP ROUTE
    • ROUTE Exams
  • CCNP SWITCH
    • SWITCH Exams
  • CCNP TSHOOT
  • Home
  • Join
  • Downloads
  • About Us
  • Whitepapers
  • Feature Articles
  • Helpdesk
  • FAQ
  • Free Training
You are here: Home / neighbor

neighbor

Command

Neighbor

Use

This command tells OSPF to communicate with unicast updates to a specific neighbor. This is particularly useful over non-broadcast links, such as frame-relay, as adjacenies will not form by default.

Syntax

Router(config-router)#neighbor <ip address>

Example

neighbor

In this example, we will configure R4 to send its updates to R3 using unicast. First, we’ll configure OSPF on R1, R3, and R4 for all interfaces.

R4(config-router)#router ospf 1
R4(config-router)#network 0.0.0.0 0.0.0.0 area 0

After a couple minutes R4 still doesn’t have any adjacencies.

R4(config-router)#do show ip ospf neighbor

R4(config-router)#

Notice that the OSPF network type is non_broadcast, so it will require unicast updates.

R4(config)#do show ip ospf interface s0/0
Serial0/0 is up, line protocol is up
Internet Address 10.4.4.4/24, Area 0
Process ID 1, Router ID 4.5.5.5, Network Type NON_BROADCAST, Cost: 64
Transmit Delay is 1 sec, State DR, Priority 1
Designated Router (ID) 4.5.5.5, Interface address 10.4.4.4
No backup designated router on this network
Timer intervals configured, Hello 30, Dead 120, Wait 120, Retransmit 5
oob-resync timeout 120
Hello due in 00:00:25
Supports Link-local Signaling (LLS)
Index 1/1, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 0, maximum is 0
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 0, Adjacent neighbor count is 0
Suppress hello for 0 neighbor(s)

After we configure the neighbor statement, the adjacencies come up.

R4(config)#router ospf 1
R4(config-router)#neighbor 10.4.4.1
R4(config-router)#neighbor 10.4.4.3

R4(config-router)#
*Mar 1 00:45:55.347: %OSPF-5-ADJCHG: Process 1, Nbr 133.133.133.133 on Serial0/0 from LOADING to FULL, Loading Done
*Mar 1 00:45:55.359: %OSPF-5-ADJCHG: Process 1, Nbr 111.111.111.111 on Serial0/0 from LOADING to FULL, Loading Done

Get access to over 5 hours of IT webinar videos as well as regular study tips and ideas when you
join our mailing list

About This Site

We replaced this site some time ago with an upgraded version. Please feel free to enjoy the content and if you like what you see check out our brilliant new site:

howtonetwork.com

Keep In Touch

About Us

This is a free access website which has now been replaced by howtonetwork.com.

Navigation

  • Home
  • Join
  • Downloads
  • About Us
  • Whitepapers
  • Feature Articles
  • Helpdesk
  • FAQ
  • Free Training

Copyright

All content is protected by international copyright laws. Copyright Reality Press Ltd.

Copyright © 2023 · Dynamik Website Builder on Genesis Framework · WordPress · Log in