From: Mas Kato (tealp729@xxxxxxxx)
Date: Sun May 20 2001 - 18:46:29 GMT-3
Vincent,
In a partially-meshed NBMA environment, the purpose of manipulating the
DR election and statically configuring neighbors is to emulate a
broadcast environment. When you force the hub to become the DR, the
spokes form adjacencies with the hub and not each other. OSPF packets
from the spokes is unicasted to the hub, which in turn, does its
DR-thing and unicasts the updates to the other spokes.
Regards,
Mas
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
windchong0008
Sent: Sunday, May 20, 2001 5:37 AM
To: ccielab@groupstudy.com
Subject: Re: NBMA Question on OSPF
Hi;
I missed out some information
The adjacency can not be formed only spoke to spoke, frame map or
inverse arp does not make any difference, try both alreay, broadcast in
frame map statment.
The adjacency can be establishe betwen hub and spoke 1, hub and spoke 2.
All subnet mask are in 24 bits, sorry for my mistyping.
PS. It's valld Frame Realy configuration. But I just want to see this
configuation will work if configuration OSPF.
TIA
Vincent
>Hello,
>
>I will write in your config for the remarks...*
>
>--- windchong0008 <windchong0008@sinaman.com> a icrit : > Hi;
>>
>>
>> I was trying to working out an simple NBMA network scenario. It
is a
>> relative simple environment, but I could not figure out why my 2
spoke can
>> not establish adjacency, able to ping every interface.
>>
>> Hub Router cofiguration,
>> Router 1
>> interface serial 0.1 multipoint
>> ip address 172.16.1.3
>* verify your mask is 255.255.255.0 (must be the same for all
interfaces
>involved in ospf process)
>
>> frame-relay interface-dlci 102
>> frame-relay interface-dlci 103
>* Well am really not sure about this, but as other interfaces are frame
map
>i think Frame inarp don't work and its router will not see other's
address, so
>maybe you have to do mapping here also.
>>
>> router ospf 1
>> network 172.16.1.0 0.0.0.255 area 0
>> neighbor 172.16.1.1
>> neighbor 172.16.1.2
>>
>> Router 2 (Spoke 1)
>> interface serial 0
>> ip address 172.16.1.1
>> encapsulation frame-relay
>> frame-map ip 172.16.1.3 201
>> frame-map ip 172.16.1.2 201
>* you maybe need frame-map ip 172.16.1.3 201 broadcast
>(for all dlci and all interfaces on spoke)
>>
>> router ospf 1
>> network 172.16.1.0 0.0.0.255 area 0
>> neighbor 172.16.1.3 priority 10
>*I read some where it is better to put priority 0 for spoke and a high
number
>for hub(in case router reboot and can become the DR). (a very good
paper :
>IE-FRAME-WP1-F03 www.certificationzone.com)
>> neighbor 172.16.1.2
>>
>> Router 3 (Spoke 2)
>> interface serial 0
>> ip address 172.16.1.2
>> encapsulation frame-relay
>> frame-map ip 172.16.1.3 301
>> frame-map ip 172.16.1.1 301
>> router ospf 1
>> network 172.16.1.0 0.0.0.255 area 0
>> neighbor 172.16.1.3 priority 10
>> neighbor 172.16.1.1
>>
>> I do not know it's valid configuration for ospf or not.
>>
>> Any advice welcome
>> TIA
>> Vincent Chong
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>=====
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