forward-mode centralized

Function

The forward-mode centralized command sets the forwarding mode of an SVF system to centralized forwarding.

The undo forward-mode command restores the default forwarding mode of an SVF system.

By default, the forwarding mode of an SVF system is distributed forwarding.

This command can only be executed on a parent switch.

forward-mode centralized

undo forward-mode

None

uni-mng view

3: Management level

Usage Scenario

An SVF system uses the distributed forwarding mode by default. You can change the forwarding mode to centralized mode.

In centralized forwarding mode, traffic forwarded by the local AS and forwarded between ASs is sent to the parent for forwarding.
In distributed forwarding mode, an AS directly forwards local traffic and the parent forwards traffic between ASs.

Precautions

After changing the SVF forwarding mode, you must run the commit as { name as-name | all } command to commit the configuration so that the device can deliver it to ASs.
In centralized forwarding mode, ports of the ASs connected to the same fabric port of the parent are isolated and so cannot communicate at Layer 2, and need to have proxy ARP in the corresponding VLAN configured using the arp-proxy inner-sub-vlan-proxy enable command to communicate at Layer 3.
In centralized forwarding mode, after an AS goes offline, traffic of its attached network cannot be forwarded by the parent and will be interrupted.
In distributed forwarding mode, after an AS goes offline, in versions earlier than V200R012C00, downlink ports of the AS are automatically error down. As a result, traffic of the AS attached network will be interrupted. In V200R012C00 and later versions, downlink ports of the AS will not be error down, and traffic of the AS attached network will be forwarded as usual.

# Set the SVF forwarding mode to centralized forwarding.

<HUAWEI> system-view
[HUAWEI] uni-mng
[HUAWEI-um] forward-mode centralized