HP ProCurve 9304M Installation And Configuration Manual page 95

Figure 4.5 DMAs and ports on a
DMA
Port
1
On a Standard 8-port Gigabit Ethernet module, separate DMAs control ports 1 – 2, 3 – 4, 5 – 6, and 7 – 8. When
per-DMA TSP load sharing is enabled, the T-Flow assigns forwarding responsibility for each DMA's ports to a TSP
so that the forwarding load is balanced among the TSPs. This means that a single module's ports can be
distributed across multiple TSPs. In previous releases, the T-Flow assigned all of a module's ports to only one
TSP.
NOTE: In release 07.6.04, per-DMA TSP load sharing is supported only for Standard 8-port Gigabit Ethernet
modules. Modules that do not support per-DMA TSP load sharing will have all of their ports assigned to a single
TSP, even if per-DMA TSP load sharing is enabled on the device.
Configuring Per-DMA TSP Load Sharing
To configure the T-Flow to use per-DMA TSP load sharing, you can do the following:
• Assign ports to individual TSPs statically. Forwarding for all of the ports controlled by the specified port's
DMA are handled by the specified TSP.
• Allow the T-Flow to assign DMAs to TSPs dynamically. When the device is started or reset, the T-Flow load
balances processing by assigning DMAs to the TSPs according to the total bandwidth of the DMAs.
The following command assigns the DMA that controls port 2/1 to TSP 1 on the T-Flow in slot 1:
HP9300(config)# vm vm-map port-dma 2/1 vm-slot 1 vm-cpu 1
Syntax: [no] vm vm-map port-dma <port> vm-slot <slot> vm-cpu <TSP-cpu>
To assign a DMA to a TSP, you specify any of the ports controlled by the DMA as the <port> parameter.
Forwarding for all of the ports controlled by the DMA is then handled by the specified TSP. This command is
similar to the vm vm-map slot command, which allows specific modules to be assigned to specific TSPs.
To configure the T-Flow to assign DMAs to TSPs dynamically at startup, enter the following command:
HP9300(config)# vm vm-map per-port-dma
Syntax: [no] vm vm-map per-port-dma
If the vm vm-map per-port-dma command is in the HP device's configuration when the device is started or reset,
the T-Flow uses per-DMA TSP load sharing. Otherwise, the T-Flow uses per-module TSP load sharing to balance
forwarding among the TSPs.
If any ports or modules are statically assigned to TSPs, then those assignments are made prior to any dynamic
assignments. You can have both per-module static assignments and per-DMA static assignments in a
configuration.
Static per-DMA assignments take precedence over static per-module assignments. For example, if the ports
controlled by DMA 1 in slot 2 are statically assigned to TSP 1 in slot 1, and the module in slot 2 is statically
assigned to TSP 2 in slot 1, then all the ports controlled by all the DMAs except DMA 1 are assigned to TSP 2, and
the ports controlled by DMA 1 are assigned to TSP 1.
Standard
8-port Gigabit Ethernet module
Switch Fabric
DMA
Port Port Port
2 3 4
Using the T-Flow Redundant Management Module
DMA DMA
Port Port Port Port
5 6 7 8
4 - 7