From: Pat Bodin (pbodin@xxxxxxxxx)
Date: Sat Apr 28 2001 - 07:59:14 GMT-3
Brennan,
ATM VPIs/VCIs are layer 2 identifiers (i.e., like FR DLCIs, Dialer strings).
Like FR, you will map a vpi/vci pair to a layer 3 address (remote address to
local vpi/vci). Also like FR, the VPI/VCI pair is only locally signifant.
Also, you can look at all 3 layer 2 technologies (dynamic/static) mappings
to layer 3 address similarily (sh dialer map, sh atm map, sh frame map).
So, they are conceptual alike. However, they are configured very
differently.
Here is a tidbit of config info on CLIP (1577)
First, you get the NSAP address from the LS1010 (ATM Switch). So, they've
got to give it to you. In my switch the NSAP address is
47.0091.8100.0000.0030.809C.1F01.0060.3e5b.6201.00. You don't need the last
3 octets and selecter byte of this address (its the esi address of the
switch). So, the first part of the nsap address is
47.0091.8100.0000.0030.809C.1F01. Many times you will see the periods taken
out. It doesn't matter how you use it. Next, you need to have the esi
address you will be using. One side of the ATM will have an "atm arp-server
nsap" address. The other side will have an "atm arp-server self" statement.
Although it doesn't have a NSAP address, the "self" side will have an esi
address which you can make up (it just needs to be 3 octets with a selector
byte). So, in my example I used 000000002222.03 as my arp servers esi
address. So, both sides of the ATM cloud get their own made up esi
addresses. On the side that is not the arp-server you will put the atm
arp-server nsap <atm switch nsap w/o esi>.<arp servers esi address>. The
important part here is that nothing needs to be changed on the ATM switch.
In fact, you can leave your pvcs on the switch and it will keep the svcs and
pvcs provisioned.
I hope that helps. It definitely helps me. I've given you a sample config
below.
r1
interface ATM0
no ip address
no ip directed-broadcast
atm pvc 5 0 5 qsaal
atm pvc 16 0 16 ilmi
!
interface ATM0.1 multipoint
description RFC1577 with ARP and SVCs
ip address 134.4.17.2 255.255.255.252
no ip directed-broadcast
atm esi-address 000000001111.03
atm arp-server nsap 47.00918100000000603e5b6201.000000002222.03
r2
interface ATM2/0
no ip address
no ip directed-broadcast
atm pvc 5 0 5 qsaal
atm pvc 16 0 16 ilmi
!
interface ATM2/0.1 multipoint
description RFC1577 ARP server
ip address 134.4.17.1 255.255.255.252
no ip directed-broadcast
atm esi-address 000000002222.03
atm arp-server self
atm switch
NO CHANGES!
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Murphy, Brennan
Sent: Saturday, April 28, 2001 11:32 AM
To: 'ccielab@groupstudy.com'
Subject: VPI/VCI, DLCI, Dialer String
What are the significant differences among these?
VPI/VCI pair
DLCI
Dialer String
Anyone have a short writeup? I dont have any practical experience
with ATM...only ISDN and Frame Relay. I was looking for an introduction
to ATM that focuses on its similarities and differences from FR and ISDN.
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