Re: OSPF Neighbor CMD

From: Narbik Kocharians (narbikk@gmail.com)
Date: Fri Oct 24 2008 - 11:45:11 ARST

In a hub and spoke you should configure the spokes with a priority of 0 so
they wont participate in the DR election, and when you do that it should NOT
take the neighbor command.

R1#sh run int s0/0/0
Building configuration...
Current configuration : 138 bytes
!
interface Serial0/0/0
 ip address 1.1.1.1 255.0.0.0
 encapsulation frame-relay
* ip ospf priority 0*
 frame-relay map ip 1.1.1.2 102
end

*Now i will use the neighbor command*
R1#conf t
Enter configuration commands, one per line. End with CNTL/Z.
R1(config)#router ospf 1
R1(config-router)#*neighbor 1.1.1.2
*
R1(config-router)#*do sh run | s router
*router ospf 1
 log-adjacency-changes
 network 1.1.1.1 0.0.0.0 area 0

*Note it does not take the priority command. It takes the command but it
does not use it.*

*On R2*

R2#sh run int s0/0/0
Building configuration...
Current configuration : 118 bytes
!
interface Serial0/0/0
 ip address 1.1.1.2 255.0.0.0
 encapsulation frame-relay
 frame-relay map ip 1.1.1.1 201
end

R2#sh run | s router
router ospf 1
 log-adjacency-changes
 network 1.1.1.2 0.0.0.0 area 0
 network 20.2.2.2 0.0.0.0 area 0
 *neighbor 1.1.1.1*

*Note it took the neighbor command because the priority is NOT 0*

On Thu, Oct 23, 2008 at 6:11 PM, Joseph Brunner <joe@affirmedsystems.com>wrote:

> Everything is very slow with dynamips... rent some rack time !
>
> -LOL
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Jason Madsen
> Sent: Thursday, October 23, 2008 9:07 PM
> To: Cisco certification
> Subject: Re: OSPF Neighbor CMD
>
> I stand corrected again...it did work, but it was VERY slow. I was testing
> via Dynamips btw...
>
> Jason
>
> On Thu, Oct 23, 2008 at 7:05 PM, Jason Madsen <madsen.jason@gmail.com
> >wrote:
>
> > ok I take back part of what I said...with "ip ospf net non" an adjacency
> > doesn't seem to form without using "neighbor" on both ends of the link.
> > With "ip ospf net point-to-multi non" it didn't seem to matter either
> way.
> >
> > Jason
> >
> >
> > On Thu, Oct 23, 2008 at 6:59 PM, Jason Madsen
> <madsen.jason@gmail.com>wrote:
> >
> >> Hi Group,
> >>
> >> To be officially correct, do we need to use the "neighbor" command on
> one
> >> side of each link or on both sides of each link? From what I've seen
> OSPF
> >> always seems to work just fine with "neighbor" on one end of the link
> only
> >> and as a matter of face I've read more than one writeup stating that
> >> configuring it on both ends of a link rather than just one can actually
> >> cause problems in some scenarios.
> >>
> >> This is strictly an "approved in the lab" type question. As I stated,
> >> I've never had issues with just configuring this command on one end of a
> >> given link without any issues. I did find one somewhat vague statement
> in
> >> the Command Reference that leads me to believe that in Cisco's eyes we
> are
> >> to use this command on both ends of a link for it to be "correct". Here
> is
> >> the statement:
> >>
> >> *"One neighbor entry must be included in the Cisco IOS software
> >> configuration for each known nonbroadcast network neighbor*" (
> >>
>
> http://www.cisco.com/en/US/docs/ios/iproute/command/reference/irp_osp2.html#
> wp1013124
> >> ).
> >>
> >> I guess technically this statement would lead me to believe that it
> should
> >> be on both ends. Anyone have any insight as to what would be "correct"
> in
> >> a lab scenario?
> >>
> >> Thanks,
> >> Jason
>
>
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-- 
Narbik Kocharians
CCSI#30832, CCIE# 12410 (R&S, SP, Security)
www.MicronicsTraining
www.Net-Workbooks.com
Sr. Technical Instructor

Blogs and organic groups at http://www.ccie.net

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