Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Attention: The Cisco Support Community site will be in read only mode on Dec14, 2017 from 12:01am PST to 11:30am for standard maintenance. Sorry for the inconvenience.

New Member

DR of ospf

Hi,

base on the cisco doc, there is only one DR/BDR in segment. If we had ospf, the setting is as following:

router ospf 10

network 192.168.10.0 0.0.0.255 area 0

network 192.168.15.0 0.0.0.255 area 0

network 192.168.18.0 0.0.0.255 area 0

network 192.168.22.0 0.0.0.255 area 0

network 192.168.25.0 0.0.0.255 area 0

Does it mean that there is one DR on 192.168.10.o segment, one DR on 192.168.15.0 segment .....

it has 5 DR totally. Is it correct?

Best regards

1 ACCEPTED SOLUTION

Accepted Solutions
Hall of Fame Super Silver

Re: DR of ospf

We might need to qualify it a bit, but essentially yes you are correct that there would be 5 DR.

If the 5 network statements correspond to 5 interfaces (what if there were a 192.168.10.0/25 and 192.168.10.128/25 - they would both match to the first network statement and each could have a DR) and if each of the interfaces are a network type that elects DR, then yes there would be 5 DR.

HTH

Rick

2 REPLIES
Hall of Fame Super Silver

Re: DR of ospf

We might need to qualify it a bit, but essentially yes you are correct that there would be 5 DR.

If the 5 network statements correspond to 5 interfaces (what if there were a 192.168.10.0/25 and 192.168.10.128/25 - they would both match to the first network statement and each could have a DR) and if each of the interfaces are a network type that elects DR, then yes there would be 5 DR.

HTH

Rick

New Member

Re: DR of ospf

Hi

if the network u specified is point-to-point network interfaces than u have no DR here also.

If the interfaces are boradcast medium -e.g Lan...then u need one DR nad one BDR on each segments i.e. 5 in yur case.

103
Views
0
Helpful
2
Replies
CreatePlease to create content