From: Chris Larson (clarson52@comcast.net)
Date: Mon Oct 06 2003 - 00:39:29 GMT-3
In the lab environment, if you only do no frame relay inverse arp on all
your routers then there won't be any dynamic assignments of dlci's and you
should be fine.
If you do both then just be aware that some things depend on inverse arp to
work.
For instance...if you are asked to perform or configure a router for
autoinstall then you will need frame relay arp to reply to a router looking
to autoinstall.
----- Original Message -----
From: "Snow, Tim" <timothy.snow@eds.com>
To: "'Mac'" <lmac0303@hotmail.com>
Cc: <ccielab@groupstudy.com>
Sent: Sunday, October 05, 2003 10:20 PM
Subject: RE: OSPF NBMA
> 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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