I'll try to answer your questions base on what we are doing.
Usually, these VPI/VCI pairs are the layer2 identifier when trasmitted over the ATM switches (i.e. MGX 8850s or Lucent PSAX). A PVC as the name implies is a Permanent Virtual Circuit so it means permanent. VPI/VCI is like the DLCI of a Frame-relay circuit. Just like frame-relay, ATM also has point-to-point subinterfaces and multipoint subinterfaces. You can create multiple point-to-point subinterfaces if you want to have multiple point-to-point virtual circuits. Same as a multipoint, a multipoint sub-if can have multiple neighbors or peers on a single subinterface.
I don't know if you are sure to make 2000 VCs on a single ATM interface as it will be pain in the butt. When the interface goes down, all 2000VCs will also go down. And you will defin need a very powerful router to do that and I do not know if there is one. (I'm guessing on this part as I haven't read the white paper or data sheet of the routers)
there are features that can be of help in your scenario like ILMI PVC discovery.
ILMI is the protocol spoken between a router ATM DTE interface and the connected ATM switch port.
Configuring PVC Discovery Example
The following example shows how to enable PVC Discovery on an ATM main interface 2/0. The keyword subinterface is used so that all discovered PVCs with a VPI value of 1 will be assigned to the subinterface 2/0.1. For further information, refer to the section "Configuring PVC Discovery" earlier in this chapter.
Other possible tools for scalability can be the VC classes
If you look at the document from the beginning you will see that configuration ranges from a totally manual configuration where the network admin specifies the PVC to be used and what remote device can be reached on that specific VPI/VCI value. At the other end there are the VC classes and the ILMI PVC autodiscovery features that takes advantage of ATM signalling protocols for forms of auto-provisioning.
Another important note is the following: each Cisco router platform has a limit on the maximum number of interfaces (including physical and logical interfaces like loopbacks or tunnels) that can be configured on device.
Devices like C10000, C6400, or C7200 with specific license have an increased IDB count to deal with high number of subinterfaces
so not all platforms could support 2000 ATM subinterfaces. To be noted that using multipoint ATM subinterfaces one subif is associated to multiple and potentially many ATM PVCs as shown in ATM ILMI PVC discovery example.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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