Downlink-to-uplink interface mappings, Disruptive load balancing, Npv configuration task list – H3C Technologies H3C S12500-X Series Switches User Manual

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Downlink-to-uplink interface mappings

NPV switches automatically map downlink interfaces to uplink interfaces. Before a downlink interface is

brought up, the NPV switch maps it to the uplink interface with the minimum load among all operational

uplink interfaces. The load here indicates the number of downlink interfaces mapped to the uplink
interface.
When automatic mapping cannot meet requirements (for example, when a downlink interface must be

connected to a fabric through a specified uplink interface), you can manually map the downlink interface

to a specified uplink interface or a set of uplink interfaces. After you configure the mapping, the downlink

interface can be mapped to only the configured uplink interfaces. If none of the configured uplink
interfaces is operational, the downlink interface cannot be operational.
A configured mapping selects the uplink interface with the minimum load from configured uplink

interfaces and then maps the downlink interface to it.
After a mapping is established, all traffic from the downlink interface is forwarded through the uplink
interface.

Disruptive load balancing

When a new uplink interface becomes operational, the NPV switch does not perform a remapping for

load balancing. In the event of remapping, the NPV switch reinitializes the downlink interface so that the

nodes connected to the downlink interface register with the core switch again. This causes traffic

interruption to the nodes.
You can trigger a remapping by using commands for better load balancing. In this case, the NPV switch
reinitializes all downlink interfaces.

NPV configuration task list

Tasks at a glance

Remarks

(Required.) Configuring the switch to operate in NPV mode

See "

Configuring an FCoE mode

(Required.)

Configuring uplink interfaces and downlink

interfaces

N/A

(Optional.)

Configuring downlink-to-uplink interface