Identifying Physical And Logical Elements; Cisco Mgx 8850 Routing Switch Command Reference; Axsm Format; Pnni Format - Cisco MGX 8850 Command Reference Manual

Identifying Physical and Logical Elements

Identifying Physical and Logical Elements
The Private Network-to-Network Interface (PNNI) control protocol and the service modules use
different formats to identify the same entity. For example, the format of a logical port that you enter on
an AXSM is different from the format you would enter on the PXM45. This section describes these
formats in the PNNI and AXSM contexts and how they correspond to each other. The parallel actions of
configuring or displaying logical elements on different cards is broadly illustrated in the Cisco
MGX 8850 Routing Switch Software Configuration Guide, Release 2.0.
Apart from the way PNNI and the lower levels of logic identify the same element, the sequence of
commands also needs explanation. When you configure logical ports—for just one example—you must
complete certain tasks on the AXSM CLI before or after related PNNI tasks. For certain commands, this
manual lists prerequisite commands or tasks. For more details on the sequence of tasks, refer to the Cisco
MGX 8850 Routing Switch Software Configuration Guide, Release 2.0, for more details of this sequence.

AXSM Format

On a service module, you identify the follow when you provision the capabilities of the card:
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Not all of these elements correspond to elements you specify on the PXM45. Subsequent paragraphs
describe only the common elements that are visible on the CLI of the PXM and the service module. The
preceding elements are further defined in the Cisco MGX 8850 Routing Switch Software Configuration
Guide, Release 2.0.
For a UNI or NNI, one logical interface (or logical port) exists per physical line. For virtual network to
network interfaces (VNNIs), you can configure multiple ports on a line. The maximum number of logical
ports on an AXSM is 60 regardless of the AXSM model or the number of lines on the back cards. The
range of logical port numbers is 1–60 for an AXSM regardless of whether the interface type is UNI, NNI,
or VNNI.

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:
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Cisco MGX 8850 Routing Switch Command Reference

4-2
Slot
Bay
Line
Logical port
Port group
Resource partition
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.
Chapter 4
Release 2.0, Part Number 78-10467-04 Rev C0, October 2001
ILMI Commands