8-4
Cisco MGX 8850 Routing Switch Command Reference
Release 2.0, Part Number 78-10467-04 Rev C0, October 2001
Chapter 8
Network Optimization Commands
Identifying Physical and Logical Elements
PNNI Format
The PNNI controller requires the following format to identify a physical port:
[shelf.]slot[:subslot].port[:subport]
The PNNI physical port identifier (physical port ID) consists of a series of mandatory elements. Note
the period or colon associated with each element inside the square brackets. The elements of the physical
port ID are as follows:
•
The shelf is always 1 for the current product and so is usually omitted.
•
The slot number of the front card.
•
Subslot is the number of the bay where the back card resides. This number is 1 or 2.
•
Port is the physical line.
•
Subport corresponds to the resource partition on the AXSM. For a UNI or NNI, this resource
partition is the same number as the logical port number (ifNum) on the AXSM. For a virtual
network-to-network interface (VNNI), the number does not directly correspond to the
For each physical port number, PNNI also generates a logical port number as an encrypted form of the
physical port number. The logical port number appears as an unformatted numerical string. For example,
a PNNI physical port ID may have the form 1:1.2:2, so the PNNI logical port number would be
16848898. Where needed, the descriptions in the PNNI command chapter define the need for this logical
port number. (This section does not define a PNNI logical port number, nor does it describe the
correspondence between an AXSM port and a PNNI logical port number.) For the correspondence
between a PNNI physical port and the port identifier on an AXSM, see
Table 8-4
.
As the table shows, a port to PNNI is a line on the AXSM, and a subport to PNNI is a logical interface
(or logical port) on an AXSM. An example of a PNNI physical port identifier is 1:2.1:1. This portid
corresponds to an AXSM, with the following particulars:
Slot 1
Bay 2
Line 1
Logical interface 1 (or logical port 1)
Table 8-4
Mapping PNNI Port ID to AXSM Elements
PNNI port
AXSM
Shelf
N/A
Slot
Slot
Subslot
Bay (for upper or lower back card)
Port
Line
Subport
Logical interface (or port)
