Administrator Guide

● For DCBx, on a port interface, enable LLDP in both Send (TX) and Receive (RX) mode (the protocol lldp mode
command; refer to the example in CONFIGURATION versus INTERFACE Configurations in the Link Layer Discovery Protocol
(LLDP) chapter). If multiple DCBx peer ports are detected on a local DCBx interface, LLDP is shut down.
● The CIN version of DCBx supports only PFC, ETS, and FCOE; it does not support iSCSI, backward congestion management
(BCN), logical link down (LLDF), and network interface virtualization (NIV).
Configuring DCBx
To configure DCBx, follow these steps.
For DCBx, to advertise DCBx TLVs to peers, enable LLDP. For more information, see Link Layer Discovery Protocol (LLDP).
Configure DCBx operation at the interface level on a switch or globally on the switch.
1. Configure ToR- and FCF-facing interfaces as auto-upstream ports.
2. Configure server-facing interfaces as auto-downstream ports.
3. Configure a port to operate in a configuration-source role.
4. Configure ports to operate in a manual role.
NOTE: The DCBx configuration is not supported on cascade interfaces or extended ports
1. Enter INTERFACE Configuration mode.
CONFIGURATION mode
interface type slot/port
2. Enter LLDP Configuration mode to enable DCBx operation.
INTERFACE mode
[no] protocol lldp
3. Configure the DCBx version used on the interface, where: auto configures the port to operate using the DCBx version
received from a peer.
PROTOCOL LLDP mode
[no] DCBx version {auto | cee | cin | ieee-v2.5}
● cee: configures the port to use CEE (Intel 1.01).
● cin: configures the port to use Cisco-Intel-Nuova (DCBx 1.0).
● ieee-v2.5: configures the port to use IEEE 802.1Qaz (Draft 2.5).
The default is Auto.
4. Configure the DCBx port role the interface uses to exchange DCB information.
PROTOCOL LLDP mode
[no] DCBx port-role {config-source | auto-downstream | auto-upstream | manual}
● auto-upstream: configures the port to receive a peer configuration. The configuration source is elected from auto-
upstream ports.
● auto-downstream: configures the port to accept the internally propagated DCB configuration from a configuration
source.
● config-source: configures the port to serve as the configuration source on the switch.
● manual: configures the port to operate only on administer-configured DCB parameters. The port does not accept a DCB
configuration received from a peer or a local configuration source.
The default is Manual.
5. On manual ports only: Configure the PFC and ETS TLVs advertised to DCBx peers.
PROTOCOL LLDP mode
[no] advertise DCBx-tlv {ets-conf | ets-reco | pfc} [ets-conf | ets-reco | pfc] [ets-conf
| ets-reco | pfc]
● ets-conf: enables the advertisement of ETS Configuration TLVs.
● ets-reco: enables the advertisement of ETS Recommend TLVs.
● pfc enables: the advertisement of PFC TLVs.
The default is All PFC and ETS TLVs are advertised.
Data Center Bridging (DCB)
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