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Cisco MGX 8850 Routing Switch Command Reference
Release 2.0, Part Number 78-10467-04 Rev C0, October 2001
Chapter4 ILMI Commands
Identifying Physical and Logical Elements
Identifying Physical and Logical Elements
The Private Network-to-Network Interface (PNNI) control protocol and the ser v ice m o du l es u s e
different formats to identify the sam e entity. For example, the format of a logical por t th at y ou en ter o n
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 the y corre spo nd to each other. The parallel actions of
configuring or displaying logi cal el ements on different cards is broa dl y ill u s tr ate d in t h e Ci sco
MGX 8850 Routing Switch Software Configuration Guide, Release 2.0.
Apart from the way PNNI and t h e l ower l evels o f lo gi c i de nt if y th e s a me ele m en t, th e sequence of
commands also needs explanatio n. When you configure logical ports—for just one example—you must
complete certain tasks on the AXSM CLI before or after relate d PNNI tasks. For certain command s, this
manual lists prerequisite commands or tasks. For mor e details on the sequence of tasks, refer to the Cisco
MGX 8850 Routing Switch Softwa r e Co nf igu r ati on Gui de, Release 2.0, for more detai ls o f t his seq ue nce.
AXSM Format
On a service module, you identify the foll ow w he n you provision the ca pa bilities of the card:
•Slot
•Bay
•Line
•Logical port
•Port group
•Resource partition
Not all of these elements corre spo n d to el em en t s yo u sp eci fy o n th e P XM 4 5 . Su bse quent paragraphs
describe only the common elements t hat are visible on the CLI of the PXM and the service module. The
preceding elements are further de fined i n th e 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 maximu m number of logic al
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 regardle ss of whether the interface type is UNI, NNI,
or VNNI.
PNNI Format
The PNNI controller requires th e f o llow ing f or mat t o i de nt if y a p h ysi cal p ort:
[shelf.]slot[:subslot].port[:subport]
The PNNI physical port identifier (physical port ID) consists o f a se ries 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 th e p hy si cal line.