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 / IP OSPF Network Broadcast

IP OSPF Network Broadcast

Command

IP OSPF Network Broadcast

Use

This command manually sets the OSPF network type to broadcast, this is a default for ethernet links.
The Broadcast network type has a DR election.

Syntax

Router(config-if)#ip ospf network broadcast

Example

In this example, we will configure R4’s frame-relay link to use the broadcast network type

simple

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 broadcast network type on all routers, the adjacencies form.

R4(config)#int s0/0
R4(config-if)#ip ospf network broadcast

R4(config-if)#
*Mar 1 01:02:07.627: %OSPF-5-ADJCHG: Process 1, Nbr 111.111.111.111 on Serial0/0 from LOADING to FULL, Loading Done
R4(config-if)#
*Mar 1 01:02:11.707: %OSPF-5-ADJCHG: Process 1, Nbr 133.133.133.133 on Serial0/0 from LOADING to FULL, Loading Done
R4(config-if)#do show ip ospf neighbor

Neighbor ID Pri State Dead Time Address Interface
111.111.111.111 1 FULL/DROTHER 00:00:30 10.4.4.1 Serial0/0
133.133.133.133 1 FULL/DR 00:00:30 10.4.4.3 Serial0/0
R4(config-if)#

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