Hot Downloads

Welcome, Guest
Username: Password: Remember me

TOPIC: OSPF DR and BDR election

OSPF DR and BDR election 9 years 9 months ago #18887

Hi, I have a doubt related to the OSPF DR and the BDR election.

If Router A is a DR and Router B is BDR. Now router A fails and B becomes the DR. What will happen when router A comes up. Will there be a re-election ??
The administrator has disabled public write access.

Re: OSPF DR and BDR election 9 years 5 months ago #21107

  • krik
  • krik's Avatar
  • Offline
  • Frequent Member
  • Posts: 69
  • Karma: 0
When an OSPF router becomes active and discovers its neighbors, it checks for an active DR and BDR. If a DR and BDR exist, the router accept them. If there is no BDR, an election is held in which the router with the highest priority becomes the BDR. If there is no active DR, the BDR is promoted to DR and a new election is held for the BDR.

It should be noted taht the priority can influence an election, but will not override an active DR or BDR. If there are already DR and BDR on the LAN, they will remain DR and BDR until a failure.
Christophe Lemaire
www.exp-networks.be/blog/
The administrator has disabled public write access.

Re: OSPF DR and BDR election 8 years 2 months ago #26690

  • ariff
  • ariff's Avatar
  • Offline
  • New Member
  • Posts: 1
  • Karma: 0
untill OSPF reload it wont take any decision on router A as a DR or BDR .
The administrator has disabled public write access.

DR BDR election 7 years 10 months ago #27938

  • jack_jill
  • jack_jill's Avatar
  • Offline
  • New Member
  • Posts: 1
  • Karma: 0
Pls tell me , In a DR , BDR election , Is it the DR or BDR getting elected first?
The administrator has disabled public write access.

DR/BDR 6 years 9 months ago #33050

  • kchong_14
  • kchong_14's Avatar
  • Offline
  • Frequent Member
  • Posts: 20
  • Karma: 0
Hi jack,

If I understood your question properly, you asking which one is elected first, DR or BDR?

for that:

The DR is the first to be elected, and then the same process will repeat again for electing the BDR.
Kenneth Chong
The administrator has disabled public write access.
Time to create page: 0.082 seconds

CCENT/CCNA

Cisco Routers

  • SSL WebVPN
  • Securing Routers
  • Policy Based Routing
  • Router on-a-Stick

VPN Security

  • Understand DMVPN
  • GRE/IPSec Configuration
  • Site-to-Site IPSec VPN
  • IPSec Modes

Cisco Help

  • VPN Client Windows 8
  • VPN Client Windows 7
  • CCP Display Problem
  • Cisco Support App.

Windows 2012

  • New Features
  • Licensing
  • Hyper-V / VDI
  • Install Hyper-V

Linux

  • File Permissions
  • Webmin
  • Groups - Users
  • Samba Setup