6-2 Cisco BPX 8600 Series Reference
Dynamic Resource Partitioning for SPVCs
Dynamic Resource Partitioning for SPVCs
Also, for switch software Release 9.1, the BXM card supports dynamic resource partitioning to
support the conversion of PVCs to soft permanent virtual circuits (SPVCs). This feature is described
in the:
Cisco WAN Service Node Extended Services Processor Installation and Operations for Release 2.2
document.
BXM Cards
A BXM card set, using Application Specific Integrated Circuit (ASIC) technology, provides high
speed ATM connectivity, flexibility, and scalability. The card set is comprised of a front card that
provides the processing, management, and switching of ATM traffic and of a back card that provides
the physical interface for the card set. An example of a BPX switch network provisioned with
BXM-622 cards is shown in Figure 6-1.
The BXM card group includes the BXM-T3/E3, BXM-155, and BXM-622. These cards may be
configured to support either trunk (network) or port (service access) interfaces. The BXM T3/E3 is
available in 8 or 12 port versions with T3/E3 interfaces. The BXM-155 is available in 4 or 8 port
versions with OC3/STM-1 interfaces. The BXM-622 is available in 1 or 2 port versions with
OC-12/STM-4 interfaces. The BXM card sets are compliant with ATM UNI 3.1 and Traffic
Management 4.0 including ABR VS/VD and provide the capacity to meet the needs of emerging
bandwidth driven applications.
For additional information on ATM Connections, refer to Chapter 7, ATM Connections.
Figure 6-1 A BPX Switch Network with BXM Cards
The BXM cards are designed to support all the following service classes: Constant Bit Rate (CBR),
Variable Bit Rate (VBR), Available Bit Rate (ABR with VS/VD, ABR without VS/VD, and ABR
using Foresight), and Unspecified Bit Rate (UBR). ABR with VS/VD supports explicit rate marking
and Congestion Indication (CI) control.
All software and administration firmware for the BXM card is downloadable from the BCC and is
operated by the BXM on-board sub-system processor.
Access
Network
BPX
BPX
BPX
BPX
BPX
OC-12/STM-4
Backbone
OC-3 UNI
ATM
Hub
OC-3 UNI
PoP
OC-12 UNI
ATM
Hub
OC-12 UNI
DS3
DS3
OC-12 UNI
S6175
DS3
DS3
