OK, I have finally found out this and concluded that: Neighbor commands are ONLY required in an OSPF point-to-multipoint Non-Broadcast mode in a FR hub-and-spoke topology.
Not required in a NBMA mode or any other mode....for that matter. >From: "Cisco Nuts" >Reply-To: "Cisco Nuts" >To: [EMAIL PROTECTED] >Subject: More Confused!!! Re: Neighbor commands...Yes or No?? [7:33547] >Date: Tue, 29 Jan 2002 01:38:45 -0500 > >Hello!! > >I am even more confused now! :-( > >Just finished configuring 3 routers in a FR hub-and-spoke topology with >OSPF in the default non-broadcast mode with NO neighbor commands on the >hub router and FR map commands on both the spokes to get to one another. >It works!! I mean without the neighbor commands on the hub router, the >spoke routers are learning about the networks on the other spoke, that >too in a different area. Why?? > >Thanks! > >Here is some output: BTW: RTA is the hub and RTB and RTC the spokes. FR >configed. on physical interfaces: > >RTB routing table: > >O IA 192.168.10.192/27 [110/70] via 192.168.10.243, 00:01:20, Serial0 >O IA 192.168.10.128/26 [110/74] via 192.168.10.243, 00:01:20, Serial0 > >RTA config: > >RTA#sh ru int s0 >Building configuration... > >Current configuration : 214 bytes >! >interface Serial0 > bandwidth 1544 > ip address 192.168.10.241 255.255 > encapsulation frame-relay > ip ospf priority 10 > logging event subif-link-status > logging event dlci-status-change > no fair-queue >end > >RTC routing table: > >O IA 192.168.10.64/26 [110/74] via 192.168.10.241, 00:17:50, Serial0 >O IA 192.168.10.0/26 [110/74] via 192.168.10.242, 00:17:50, Serial0 > > >From: "Henry Dziewa" >To: "Cisco Nuts" >Subject: Re: Neighbor >commands...Yes or No?? [7:33486] >Date: Mon, 28 Jan 2002 20:11:07 -0500 > > >Well, it's your loss....:) > >Hub and spoke, in order for the spoke to >talk to another spoke you >need to map the remote spoke's IP to the same >DLCI used for >mapping to HUB router on both spokes. >The HUB router >already has the mapping to both so >it knows where everyone is. > >By >default, physical frame interfaces are ospf non-broadcast, this means > >that you'd need to configure neighbor statement, preferably >on the HUB >router. > > >----- Original Message ----- >From: "Cisco Nuts" >To: >Sent: >Monday, January 28, 2002 3:42 PM >Subject: Re: Neighbor commands...Yes or >No?? [7:33486] > > > > And that's exactly what I am asking my friend. > > >First, it's the layer 2 issue..that of fr map statements to get from one > > > spoke to another via the hub....aka Mr. Caslow. > > > > And there is >the ospf issue of either issuing the neighbor commands or not > > in the >default non-broadcast mode when using physical fr intfs. > > > > Is it >one of both? And that is the confusing issue for me. > > > > :-) Can you >help? > > > > > > >From: "Henry D." > > >Reply-To: "Henry D." > > >To: >[EMAIL PROTECTED] > > >Subject: Re: Neighbor commands...Yes or No?? >[7:33486] > > >Date: Mon, 28 Jan 2002 14:38:06 -0500 > > > > > >There are >2 different issues. > > > > > >1. Layer 2 to Layer 3 mapping. > > >2. >Routing > > > > > >You need to separate these 2 in order to understand >how it all works. > > >If I gave you all the answers then it wouldn't be >fair to you as you need > > >to grasp it for yourself, especially if >planning to gor for CCIE. > > > > > >""Cisco Nuts"" wrote in message > > > >[EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > > > Hello, > > > > >Would someone clarify this for me as I am getting very confused :-( > > > > > In a Frame-Relay hub-and-spoke config. using physical interfaces and > > > > > frame-relay map statements at the spokes and using OSPF, do we need >to > > > > configure neighbor commands? Yes or No? > > > > From what I >understand, OSPF works in a Non-Broadcast mode by default > > >and > > > > > neighbor commands are only needed if not a full-mesh. In this case, > >will > > >the > > > > frame-relay map commands suffice to get from one >spoke to another thru > > >the > > > > hub router? > > > > Thank you. > > > > > > > > > > > > > >_________________________________________________________________ > > > > >MSN Photos is the easiest way to share and print your photos: > > > > >http://photos.msn.com/support/worldwide.aspx > > > > > > > > > > > > > > >archives, and subscription info: > > > >http://www.groupstudy.com/list/cisco.html > > >Report misconduct and >Nondisclosure violations to [EMAIL PROTECTED] > > > > > > > > > > >_________________________________________________________________ > > >Join the world's largest e-mail service with MSN Hotmail. > > >http://www.hotmail.com > > > > > > >------------------------------------------------------------------------ > >Join the worlds largest e-mail service with MSN Hotmail. 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