Setup guide

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Cisco 6400 Software Setup Guide
OL-1183-04
Chapter2 Basic NSP Configuration
Internal Cross-Connections
Configuring PVCs (VC Switching)
A permanent virtual circuit (PVC) is a permanent logical connection that you must configure manually,
from source to destination, through the ATM network. Once configured, the ATM network maintains
the connection at all times, regardless of traffic flow. That is, the connection is always up whether or not
there is traffic to send.
The Cisco 6400 uses PVCs to pass traffic between the node line card (NLC) ATM interfaces and node
route processors (NRPs). Typically, when VC switching is used, each subscriber is bound to a specific
NRP and should be configured as a separate PVC. If the Cisco 6400 is used as an ATM switch, VCs are
simply connected between the ATM interfaces.
To create a PVC between an ATM interface and an NRP, complete the following steps beginning in
global configuration mode:
You must also configure the PVC on the NRP side. For instructions on configuring PVCs on the NRP,
see the “Permanent Virtual Circuits” section on page3-20.
Example—Internal PVC
In the following example, an internal PVC is configured between the NLC ATM interface 1/0/0 and an
NRP in slot 5. Both the NRP and NSP must be configured to create the PVC.
Configuration fragment on the NSP:
!
interface atm 1/0/0
atm pvc 0 50 interface atm 5/0/0 2 100
!
Configuration fragment on the NRP:
!
interface atm 0/0/0
pvc 2/100
!
Configuring PVPs (VP Switching)
A permanent virtual path (PVP) allows you to connect two ATM switch routers at different locations
across a public ATM network that does not support ATM signaling. Signaling traffic is mapped into the
PVP, and the switches allocate a virtual channel connection (VCC) on that VP, instead of the default
VP0. This mapping allows the signaling traffic to pass transparently through the public network. VP
switching also provides NSP redundancy at the ATM layer.
Command Purpose
Step1
Switch(config)# interface atm slot/subslot/port
Selects the NLC interface to be configured.
Step2
Switch(config-if)# atm pvc vpi vci interface atm
slot/subslot/port vpi vci
Configures the PVC, using the slot/subslot/port of the
NRP to which you want to connect the NLC.