From: Snow, Tim (timothy.snow@eds.com)
Date: Sun Oct 05 2003 - 23:20:24 GMT-3
Mac,
You should use both the "no arp frame-relay" and "no frame-relay
inverse-arp" at the same time. The "No arp frame-relay" tells the router to
not respond to inverse arp requests from a remote device. The "no
frame-relay inverse-arp" tells the router to no use inverse-arp to map local
DLCI's to remote IP's.
If you don't use these commands, it's quite possible that you will
automatically build the 0.0.0.0 dynamic mappings which could cause some
issues if you don't want a full mesh but the routers can build such a mesh.
The "ip ospf network" command can change the ospf network type on an
interface. The only true associated between this and the previous
frame-relay commands is that if you have the "broadcast" ospf network type
and you don't statically map the dlci's to remote IP's that you may have to
rely on the inverse-arp mechanism. I suggest you always map your DLCI's
yourself and disable both "arp frame-relay" and "frame-relay inverse-arp" on
your serials and map them yourself.
The best document for Frame-Relay and all it's nuisances is
http://www.cisco.com/en/US/products/sw/iosswrel/ps1818/products_configuratio
n_guide_chapter09186a00800878c7.html
Tim
#12042
-----Original Message-----
From: Mac [mailto:lmac0303@hotmail.com]
Sent: Sunday, October 05, 2003 10:01 PM
To: Brian Dennis; ccielab@groupstudy.com; Snow, Tim
Subject: Re: OSPF NBMA
Thanks, Brian and Tim, you are always so kind.
Do I need to us no arp frame-relay or no frame-relay inverse arp to make a
static map? What is the association between these commands and ip ospf
network commands? Do you know of a good document that explains that well?
thanks,
++++
MAC
++++
----- Original Message -----
From: "Brian Dennis" <bdennis@internetworkexpert.com>
To: "'Mac'" <lmac0303@hotmail.com>; <ccielab@groupstudy.com>
Sent: Monday, October 06, 2003 11:40 AM
Subject: RE: OSPF NBMA
> OSPF does not check to see if 'broadcast' is supported on the
> interface to determine the OSPF network type. A Frame-relay physical
> interface and multipoint subinterface are non-broadcast as far as OSPF
> is concerned regardless if 'broadcast' is mapped to the DLCI. You
> would need to
manually
> inform OSPF that the network supports 'broadcast' by changing the OSPF
> network type to broadcast.
>
> Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
> bdennis@internetworkexpert.com Toll Free: 877-224-8987
> Direct: 775-745-6404 (Outside the US and Canada)
> Internetwork Expert, Inc.
> http://www.InternetworkExpert.com
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> Of
Mac
> Sent: Sunday, October 05, 2003 6:11 PM
> To: ccielab@groupstudy.com
> Subject: OSPF NBMA
>
> Hi, Group,
>
> I just grabed some configuration from cisco website as below, but just
don't
> know why broadcast key-word is issued because that would make it work
> as a broadcast network. Even if there is no neighbor command, the
> network
should
> work. Your clarification is greatly appreciated.
>
> Thanks,
>
> Mac
>
> Configurations for NBMA (Using Neighbor Statements)
> http://www.cisco.com/warp/public/104/18.html
> R4-4K
>
> interface Loopback0
> ip address 3.3.3.3 255.255.255.255
> !
> interface Serial2
> ip address 1.1.1.2 255.255.255.0
> encapsulation frame-relay
> no keepalive
> frame-relay map ip 1.1.1.1 16 broadcast
> !
> router ospf 1
> network 1.1.1.0 0.0.0.255 area 0
> !
>
> R1-7010
>
> interface Loopback0
> ip address 2.2.2.2 255.255.255.255
> !
> interface Serial1/0
> ip address 1.1.1.1 255.255.255.0
> encapsulation frame-relay
> no keepalive
> clockrate 2000000
> frame-relay map ip 1.1.1.2 16 broadcast
> !
> router ospf 1
> network 1.1.1.0 0.0.0.255 area 0
> neighbor 1.1.1.2 priority 2
> !
>
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