A lot of the confusion around DLCI's was cleared up for me when I started
configuring routers as frame switches and did frame route statements. Only
needed to do a couple before it sunk through what was happening and how it
worked.
For example, say you have a router acting as a frame switch, and it has four
serial interfaces, each connected to and end router.
S0, s1, s2, and s2 connected respectively to routers r0, r1, r2, and r3
S0 is the hub of a hub and spoke
S0 configuration:
Frame-relay route 16 int s1 225
Frame-relay route 17 int s2 407
Frame-relay route 18 int s3 996
S1 configuration
Frame-relay route 225 int s0 16
S2 configuration
Frame-relay route 407 int s0 17
S3 configuration
Frame-relay route 996 int s0 18
When you issue the command show frame-relay pvc on r0, you will see DLCI's
16,17, and 18
Three VIRTUAL circuits, each having a path on the frame switch to a
particular interface
The traffic comes into the switch tagged as DLCI 16 goes out of the switch
tagged as DLCI whatever.
The only limitation on DLCI's is that they fall in the range of 16-1005 ( or
so? ) A DLCI of 0 indicates an LMI ANSI frame. A DLCI of 1023 indicates an
LMI CISCO frame. The rest are used by the telco for some nefarious purpose I
have never seen explained anyplace.
Tony, you must have a lot of stuff you can clarify for us router jocks. Keep
telling us the inside stuff from the telco side. I'm something of an old dog
who learned a lot from hard knocks and a lot of time of the telephone asking
the other end to explain things in a way that didn't make my head hurt.
Learned a lot. Can always use a few more bits and pieces.
Chuck
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of Tony
van Ree
Sent: Saturday, December 23, 2000 7:55 PM
To: Timothy R Estes; [EMAIL PROTECTED]
Subject: Re: Two DLCI numbers?
Hi,
I think you may find that DLCI's are unique to a physical line. A frame
switch may have several thousand lines attached to it. Each one of these
lines has a number not all to dissimilar to a phone number. Within each of
these you can have a number of channels these are the DLCI's.
For example, a line ZX123546L may be a 2Meg service from your router to a
Frame switch. This may have attached 4 DCLI's 16,17,18,19. Another service
connected to the same switch AZ54363D could also have DLCI's 16,17,18,19.
You may have a connection (A PVC) from your DLCI 16 on line ZX123546L going
to DLCI 16 in AZ54363D. The other DCLI's might go to other switches other
lines within the same switch or another PVC to the same service.
The DLCI is between you and the switch on a particular line. This is then
considered local to you.
That's how I understand it.
Teunis,
Hobart, Tasmania
Australia
On Friday, December 22, 2000 at 02:21:32 PM, Timothy R Estes wrote:
> DLCIs are unique to each frame switch. Meaning, you may have DLCI 203 on
one
> end, and have DLCI 203 on the other, as long as the other end is connected
> to a different frame switch. Or you may have DLCI 203 on one end and DLCI
> 405 on the other. The DLCI has nothing to do with there the traffic is
> eventually going, that's why Cisco uses the term "local significance".
>
> The DLCI tells the frame switch which port to use.
> Remembering that a DLCI is a Layer 2 address might help this make sense.
>
>
> hth
>
> Timothy Estes CCNA
> Senior Network Systems Analyst
> Intermedia Communications
> Tampa FL
> [EMAIL PROTECTED]
>
> ""Yee, Jason"" <[EMAIL PROTECTED]> wrote in message
> 859B90209E2FD311BE5600902751445D35F19B@LYNX">news:859B90209E2FD311BE5600902751445D35F19B@LYNX...
> > reason is because when building the frame-relay circuit you need to
build
> > two parts , one is towards the customer from frame switch the other one
> is
> > from provider's router to frame-switch , I normally use the same dlci
nos
> > for the two parts but you can use different
> >
> >
> >
> > Jason
> >
> > -----Original Message-----
> > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
> > Jeff McCoy
> > Sent: Friday, November 03, 2000 9:37 PM
> > To: [EMAIL PROTECTED]
> > Subject: Re: Two DLCI numbers?
> >
> >
> >
> >
> > "jeongwoo park" <[EMAIL PROTECTED]> wrote in message
> > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> > > Hi all
> > > While I was reading a cisco book, I came across the
> > > fact that DLCI number has only local significance
> > > because there might be more than one DLCI number
> > > associated with one pvc.
> > > Why would any pve in frame relay network have two DLCI
> > > numbers?
> > > I know that DLCI number is given by frame relay
> > > service provider.
> > > Can someone explain this?
> > >
> > > Thanks in adv.
> > >
> > > jeongwoo
> > >
> > >
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