From: Andy (and123and@googlemail.com)
Date: Thu Feb 28 2008 - 13:43:15 ARST
For those that have the book, the question and diag are on p77. Lab 2.
For those that dont: Hub and spoke with R4 as the hub.
R1 has DLCI 101 and 110
R4 has DLCI 100 and 102
R6 has DLCI 104 and 103
Mappings are
101 - 100
110 - 104
103 - 102
I hope you can follow this, the question is:
- Config the FR portion of the network as shown in figure x and ensure that
DLCIs 110 and 104 between R1 and R6 are not used.
- Use p2p subinterfaces
The solution shows IP address on p2p and "no fram inverse-arp" on the main
interface.
The eventual solution uses PPP on the p2p interfaces with a virtual
interface but I mention it here only as reference, I do not think it matters
as to why we are using "no fr inv-arp" on main interface.
R1 (ser0/1 DLCI 101) to R4 (ser0/0 DLCI 100)
R1 (ser0/1 DLCI 110) to R6 (ser5/0 DLCI 104)
R6 (ser5/0 DLCI 103) to R4 (ser0/0 DLCI
On 28/02/2008, Marc La Porte <marc.a.laporte@gmail.com> wrote:
>
> Andy,
>
> Are both DLCIs 104 and 110 on both R1 and R6? And the p2p sub-interface is
> for instance using DLCI 104 on both sides? Then the "no frame inv" makes
> sense on the main interface, because all DLCIs coming in from the FR switch
> on that main interface are automatically assigned to the main interface, so
> if you're using DLCI 104 (for instance) on your p2p sub-interface that still
> leaves you with DLCI 110 "assigned" to the main interface. Granted, as long
> as there is no IP address on the main interface there is no I-ARP going on
> (I listen to the Brian's too --- or should I say "the Brains"), but if you
> want to be sure then that's the way to go...
>
> If you could gives us a copy of the config that would help to (like you
> said) something subtle...
>
> Marc
>
> On Thu, Feb 28, 2008 at 3:43 PM, Andy <and123and@googlemail.com> wrote:
>
> > Hi
> >
> > On pages 92 and 93 of CCIE Routing and Switching LAB Practice labs by
> > Cisco
> > it gives a solution which uses "no frame relay inverse-arp" after asking
> > the
> > question "ensure that DLCIs 110 and 104 between R1 and R6 are not
> > used. The "no fr inverse-arp" is configed on a main interface and a
> > sub-interface used for p2p connection (with the IP going on the
> > sub-interface).
> >
> > Now I know that "no frame relay inverse-arp" on an interface without an
> > IP
> > address does nothing (coz I have read the mails from Brian Dennis ;-)
> > But
> > then why does the Cisco Press book award one point for this??? In a lab
> > scenario I would not config the command where an IP address does not
> > exist
> > as I would view this as overconfiguration. Am I missing something subtle
> > here?
> >
> > -A
> >
> > _______________________________________________________________________
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