Beta Draft Confidential
Configuring ATM Over MPLS Trunks
Configuring Feeder Logical Ports
ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000 1/19/058-27
For ATMoMPLS UNI/NNI feeder logical ports, you can configure the fields in the
ATM FCP tab as described in Table 8-6.
Table 8-6. Add Logical Port: ATM FCP Tab Fields
Field Action/Description
Auto RM Generation Select the mode for Auto RM Generation. Options include:
• Allow (default) – RM cell generation is automatically
disabled for a VC if no upstream FCP-enabled IOM is
detected for the VC in the adjacent upstream switch.
• Override – The switch continues to generate RM cells
regardless of whether or not an adjacent upstream switch
contains an FCP-enabled IOM.
Cell Generation Any port on an IOM can generate CCRM and backward
congestion message (BCM) cells and can be configured to not
generate RM-type cells (by selecting the No Loop option in the
pull-down list). These types of cells let you configure different
closed-loop, flow control algorithms on the same IOM.
Because RM cells are generated in the backward direction, the
type of RM cells generated depends on the configuration of the
logical port through which they are transmitted.
From the pull-down list, choose one of the following:
• No Loop — Use the No Loop option (default) to configure
the VC to not generate RM cells.
• CCRM — A subset of the ABR RM cells described in the
ATM Forum’s ATM Traffic Management Specification,
Version 4.0. The Protocol ID field in each RM cell is
defined as the CCRM ID, indicating that it is a CCRM cell.
The default value for the CCRM ID is always set at a value
of 6 and cannot be modified.
• BCM — Provide a different RM cell mechanism and may
also provide interoperability with non-Lucent ATM
switches. The Protocol ID field in each BCM cell is defined
as the BCM ID. The default value for the BCM ID is
always set at a value of 5 and cannot be modified.
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