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Chapter 8 Permanent Virtual Connections (PVCs and PVPs)
Avaya M770 ATM Switch User’s Guide 109
Managing PVP Connections
Managing PVP Connections
In some network configurations there may be a need to configure a Permanent
Virtual Path (PVP) which is sometimes called Tunneling. The PVP or the Tunnel is
created to cross as many ATM switches as needed, so the remote ends would see
each other as if they are adjacent. This is done by creating Virtual Ports on the
remote switches using a specified VPI, and this VPI is switches through out the
ATM network.
The above example shows a direct connection between switches A and B. Two
vports were created, A.1 (vport on switch A using VPI 1) and B.2 (vport on switch B
using VPI 2). The Virtual Path Connection (VPC) between the two switches is
constructed using 3 PVPs in switches X, Y, and Z: X.1 - X.4, Y.4 - Y.5, and Z.5 - Z.2
respectively. In this example, a letter (A, B, X, Y, Z) represents a switch port. The
number after the decimal is the VPI that is used. Note that if there is no other vport
between A and X, or B and Z (i.e vports A.0 and B.0 are disabled), then switches A
and B would not know that switches X, Y, and Z exist.
Note: Before you attempt to set up a PVP you will need to configure two things:
1. Define the VPI range that is used for VP switching. By default, all VPIs are used
for VC switching, and VP switching is disabled. For configuring VPC VPI range
refer to “Managing VPI range for VP switching” on page 99.
2. Define the VPIs that are used to Signalled VPs, and the rest are used for
Permanent VPs. For configuring signaled VPC VPI range refer to
“Setting Virtual Port Parameters” on page 69.
Switch A Switch B
PVP X.1-X.4 PVP Y.4-Y.5 PVP Z.5-Z.2Vport A.1 Vport B.2