Service Manual

When an auto-downstream port receives and overwrites its configuration with
internally propagated information, one of the following actions is taken:
• If the peer configuration received is compatible with the internally propagated
port configuration, the link with the DCBx peer is enabled.
• If the received peer configuration is not compatible with the currently configured
port configuration, the link with the DCBx peer port is disabled and a syslog
message for an incompatible configuration is generated. The network
administrator must then reconfigure the peer device so that it advertises a
compatible DCB configuration.
• The internally propagated configuration is not stored in the switch's running
configuration.
• On a DCBx port in an auto-downstream role, all PFC, application priority,
ETS recommend, and ETS configuration TLVs are enabled.
Configuration
source
The port is configured to serve as a source of configuration information on the switch.
Peer DCB configurations received on the port are propagated to other DCBx auto-
configured ports. If the peer configuration is compatible with a port configuration,
DCBx is enabled on the port.
On a configuration-source port, the link with a DCBx peer is enabled when the port
receives a DCB configuration that can be internally propagated to other auto-
configured ports. The configuration received from a DCBx peer is not stored in the
switch’s running configuration. On a DCBx port that is the configuration source, all PFC
and application priority TLVs are enabled. ETS recommend TLVs are disabled and ETS
configuration TLVs are enabled.
Manual The port is configured to operate only with administrator-configured settings and does
not auto-configure with DCB settings received from a DCBx peer or from an internally
propagated configuration from the configuration source. If you enable DCBx, ports in
Manual mode advertise their configurations to peer devices but do not accept or
propagate internal or external configurations. Unlike other user-configured ports, the
configuration of DCBx ports in Manual mode is saved in the running configuration.
On a DCBx port in a manual role, all PFC, application priority, ETS recommend, and ETS
configuration TLVs are enabled.
When making a configuration change to a DCBx port in a Manual role, Dell Networking
recommends shutting down the interface using the
shutdown command, change the
configuration, then re-activate the interface using the no shutdown command.
The default for the DCBx port role is manual.
Data Center Bridging (DCB) 326