IBM 8265 Nways ATM Switch, User Manual

Page: 23 / 192

Virtual Path Connections
When an 8265 is physically attached to a Wide Area Network (WAN), and VP tunnelling is provided, the
device attached at the other side of the WAN appears as an adjacent device for the local switch.
Creating VPCs allows to extend the connectivity of the 8265, and to have several VP tunnels on a unique
physical interface.
Each VPC can be of UNI, PNNI or IISP type and ensures the same functionality as a physical interface.
This means that ILMI, signalling and routing may be provided per logical interface, i.e. VPC.
VPCs may be created on VOID or Public-UNI physical links, and a maximum of 512 is allowed per switch.
Figure 2 shows an example of these VPC links.
Peer Group B
PNNI
PNNI
WAN
Peer Group A
PNNI
PubUNI
Link
PubUNI
Link
PubUNI
Link
Lan Switch
Emulated
Ethernet Stations
UNI
VPC
Figure 2. UNI, IISP, and PNNI VPC Links
Chapter 1. Overview
7