Atm Connection Flow; Atm Connection Flow Through The Bpx; Advanced Cos Management; Table 21-2 Standard Atm Type And Addcon - Cisco BPX-BXM-155-8DX Installation And Configuration Manual

ATM Connection Flow

ATM Connection Flow

ATM Connection Flow through the BPX

The BPX supports the standard ATM service types, CBR, rt-VBR, nrt-VBR, ABR, and UBR. When
adding a connection by using the addcon command, you select these service types by entering one of
the CLI service type entries shown in Table 21-2 when prompted:

Table 21-2 Standard ATM Type and addcon

CLI Service Type Entries
CBR
rt-VBR
nrt-VBR
UBR
ABRSTD
ABRFST
The BPX also supports ATM to Frame Relay Network Interworking and Service Interworking
connections. When adding a connection by using the addcon command, you select these service types
by entering one of the CLI service type entries shown in Table 21-3 when prompted:

Table 21-3 ATM to Frame Relay Network and Service Interworking

CLI Service Type Entries
for addcon command
ATFR
ATFST
ATFT
ATFTFST
ATFX
ATFXFST

Advanced CoS Management

Advanced CoS management provides per-VC queueing and per-VC scheduling. CoS management
provides fairness between connections and firewalls between connections. Firewalls prevent a single
non-compliant connection from affecting the QoS of compliant connections. The non-compliant
connection simply overflows its own buffer.
The cells received by a port are not automatically transmitted by that port out to the network trunks at
the port access rate. Each VC is assigned its own ingress queue that buffers the connection at the entry
to the network. With ABR with VSVD or with Optimized Bandwidth Management (ForeSight), the
service rate can be adjusted up and down depending on network congestion.
Cisco BPX 8600 Series Installation and Configuration
21-10
Connection Description
cell bit rate
real time VBR
non real time VBR
unspecified bit rate
ABR per forum standard, with option to enable VSVD congestion control.
ABR with Cisco ForeSight congestion control.
Connection Description
ATM to Frame Relay Network Interworking
Same as ATFR with ForeSight
ATM to Frame Relay Transparent Service Interworking
Same as ATFT with ForeSight
ATM to Frame Relay Translational Service Interworking
Same as ATFX with ForeSight
Chapter 21 Configuring ATM Connections
Release 9.3.0, Part Number 78-10674-01 Rev. D0, July 2001