From: dusth@comcast.net
Date: Tue Oct 12 2004 - 18:48:36 GMT-3
Must we need to disable inverse-arp on sub interface instead of main interface?
Dustin
-------------- Original message --------------
> No. Disabling Frame Relay Inverse-ARP on the main interface
> does not automatically disable it on multipoint subinterfaces. However,
> as long as there is no layer 3 protocols configured on the main
> interface (i.e. IP, IPX, IPv6), there is no reason to disable Frame
> Relay Inverse-ARP on the main interface. This is because Frame Relay
> Inverse-ARP requests and replies are only sent for protocols that are
> enabled on the interface.
>
>
> HTH,
>
> Brian McGahan, CCIE #8593
> bmcgahan@internetworkexpert.com
>
> Internetwork Expert, Inc.
> http://www.InternetworkExpert.com
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>
>
> > -----Original Message-----
> > From: Cisco Net [mailto:network.cisco@gmail.com]
> > Sent: Tuesday, October 12, 2004 3:17 PM
> > To: Brian McGahan
> > Cc: jongsoo.kim@intelsat.com; ccielab@groupstudy.com
> > Subject: Re: Frame-relay interface-dlci and Inv ARP
> >
> > Brian/Jongsoo
> > Thank you for the explanation.
> >
> > Just one more clarification.
> > If i am using multipoint sub interfaces with frame-relay
> interface-dlci
> > command
> > and rely on on INV ARP. Now if i disable inv arp on the main interface
> > would it be disabling on the multipoint sub interface also ?
> >
> > So modifying ur example,
> >
> > interface Serial0/0
> > encapsulation frame-relay
> > no frame inv ------------> new addition
> > !
> > interface Serial0/0.1 multipoint
> > ip address 10.0.0.1 255.0.0.0
> > frame-relay interface-dlci 102
> >
> > Will it disable the inv arp on the sub interface also... Or
> > still the multipoint sub interface will learn inv arp since has not
> > particularly disabled on this interface
> > Thanks
> > Regards
> > Cert
> >
> > On Tue, 12 Oct 2004 15:56:09 -0400, Brian McGahan
> > wrote:
> > > Yes, you can use the "frame-relay interface-dlci" command
> under
> > > a multipoint subinterface to assign the circuit, and then allow
> > > inverse-arp to resolve the layer 3 to layer 2 address. The problem
> in
> > > your configuration is that you have disabled frame relay inverse-arp
> > > with the "no frame-relay inverse-arp" command. Take the following
> > > configuration:
> > >
> > > R1#
> > > interface Serial0/0
> > > encapsulation frame-relay
> > > !
> > > interface Serial0/0.1 multipoint
> > > ip address 10.0.0.1 255.0.0.0
> > > frame-relay interface-dlci 102
> > >
> > > R2#
> > > interface Serial0/0
> > > encapsulation frame-relay
> > > !
> > > interface Serial0/0.1 multipoint
> > > ip address 10.0.0.2 255.0.0.0
> > > frame-relay interface-dlci 201
> > >
> > > Note that there are no static mappings configured, however
> > > inverse-arp has not been disabled on the multipoint subinterfaces.
> > > Therefore, output from the "show frame-relay map" command will show
> that
> > > dynamic resolution has occurred through frame relay inverse-arp:
> > >
> > > R1#show frame-relay map
> > > Serial0/0.1 (up): ip 10.0.0.2 dlci 102(0x66,0x1860), dynamic,
> > > broadcast,, status defined, active
> > >
> > > R2#show frame-relay map
> > > Serial0/0.1 (up): ip 10.0.0.1 dlci 201(0xC9,0x3090), dynamic,
> > > broadcast,, status defined, active
> > >
> > > R1#ping 10.0.0.2
> > >
> > > Type escape sequence to abort.
> > > Sending 5, 100-byte ICMP Echos to 10.0.0.2, timeout is 2 seconds:
> > > !!!!!
> > > Success rate is 100 percent (5/5), round-trip min/avg/max = 4/6/8 ms
> > >
> > > HTH,
> > >
> > > Brian McGahan, CCIE #8593
> > > bmcgahan@internetworkexpert.com
> > >
> > > Internetwork Expert, Inc.
> > > http://www.InternetworkExpert.com
> > > Toll Free: 877-224-8987 x 705
> > > Outside US: 775-826-4344 x 705
> > > 24/7 Support: http://forum.internetworkexpert.com
> > > Live Chat: http://www.internetworkexpert.com/chat/
> > >
> > >
> > >
> > >
> > > > -----Original Message-----
> > > > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> Behalf
> > > Of
> > > > Jongsoo.Kim@Intelsat.com
> > > > Sent: Tuesday, October 12, 2004 2:30 PM
> > > > To: network.cisco@gmail.com; ccielab@groupstudy.com
> > > > Subject: RE: Frame-relay interface-dlci and Inv ARP
> > > >
> > > > Under multipoint sub interface, frame-rlay interface-dlci doesn't
> do
> > > > mapping
> > > > between L2 and L3.
> > > > You must do "frame-relay map command" under multipoint sub
> interface.(
> > > you
> > > > don't need point-to-point)
> > > > But "frame-relay interface-dlci" needs under multipoint sub
> interface
> > > > if you want to enter some configuration to a specific DLCI such as
> > > FRTS
> > > > map
> > > > class, VoFR, etc.
> > > >
> > > > "Show Frame-relay map" will tell you what's going on.
> > > > With frame-relay inverse-arp, it will work dynamically without any
> > > > additional config but with no frame-relay inverse-arp, you have to
> add
> > > > statically by using frame-relay map command
> > > >
> > > > Regards
> > > >
> > > > Jongsoo
> > > >
> > > >
> > > > -----Original Message-----
> > > > From: Cisco Net [mailto:network.cisco@gmail.com]
> > > > Sent: Monday, 11 October, 2004 8:28 PM
> > > > To: Group Study
> > > > Subject: Frame-relay interface-dlci and Inv ARP
> > > >
> > > >
> > > > Hi
> > > > One basic question,
> > > > When i enable interface-dlci command on a main interface or
> > > > on a multipoint sub interface, do i need to enabel INV ARP.
> > > >
> > > > In my case it did not work fine and i am assuming that "frame-rlay
> > > > interface-dlci" is expecting some kind of mapping with staic or
> > > > dynamically in case of multipoint interfaces.... I just want to
> see
> > > > this is expected or not.
> > > >
> > > > R1:
> > > > ip address 148.1.35.3 255.255.255.0
> > > > encapsulation frame-relay
> > > > clockrate 64000
> > > > no arp frame-relay
> > > > frame-relay interface-dlci 123
> > > > no frame-relay inverse-arp
> > > >
> > > > R2:
> > > > interface Serial1/0
> > > > ip address 148.1.35.5 255.255.255.0
> > > > encapsulation frame-relay
> > > > no arp frame-relay
> > > > frame-relay interface-dlci 321
> > > > no frame-relay inverse-arp
> > > >
> > > > Ping between these IP add does not work.
> > > > Please advice
> > > > Thanks
> > > > Regards
> > > > Cert
> > > >
> > > >
> > >
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