From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Tue Oct 12 2004 - 17:20:33 GMT-3
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
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: 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
> <bmcgahan@internetworkexpert.com> 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
> > >
> > >
> >
This archive was generated by hypermail 2.1.4 : Sat Nov 06 2004 - 17:11:46 GMT-3