Cisco Systems 8600 Series manual Dynamic Resource Partitioning for SPVCs, BXM Cards

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

		ATM			PoP
		Hub
	OC-3 UNI		OC-12 UNI
		BPX		BPX
ATM
Hub	OC-12 UNI
								DS3
							BPX
			OC-12/STM-4					Access
			Backbone					Network
								DS3
		BPX		BPX
	DS3
	OC-3 UNI		DS3			OC-12 UNI

S6175

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.

6-2Cisco BPX 8600 Series Reference