Addendum

Step Task Command Command Mode
FTOS(config-if-te-0/0)# dcb-map
SAN_A_dcb_map1 Repeat Steps 1 and 2 to
apply a DCB map to more than one port.
You cannot apply a DCB map on an interface
which has been already configured for PFC
using the pfc priority command or which is
already configured for lossless queues (pfc no-
drop queues command).
Configuring PFC without a DCB Map
In a network topology that uses the default ETS bandwidth allocation (assigns equal bandwidth to each
priority), you can also enable PFC for specified dot1p-priorities on individual interfaces without using a
DCB map. This type of DCB configuration is useful on interfaces which require PFC for lossless traffic but
do not transmit converged Ethernet traffic.
Step Task Command Command Mode
1 Enter interface configuration mode on an
Ethernet port.
interface
{tengigabitEthernet slot/
port | fortygigabitEthernet
slot/port}
CONFIGURATION
2 Enable PFC on specified priorities. Range:
0-7. Default: None.
Maximum number of loss less queues
supported on an Ethernet port: 2.
Separate priority values with a comma.
Specify a priority range with a dash, for
example: pfc priority 3,5-7
1. You cannot configure PFC using the pfc
priority command on an interface on
which a DCB map has been applied or
which is already configured for lossless
queues (pfc no-drop queues
command).
pfc priority priority-range INTERFACE
Configuring Lossless Queues
DCB also supports the manual configuration of lossless queues on an interface after you disable PFC
mode in a DCB map and apply the map on the interface. The configuration of no-drop queues provides
flexibility for ports on which PFC is not needed but lossless traffic should egress from the interface.
Lossless traffic egresses out the no-drop queues. Ingress 802.1p traffic from PFC-enabled peers is
automatically mapped to the no-drop egress queues.
When configuring lossless queues on a port interface, take into account:
• By default, no lossless queues are configured on a port.
• A limit of two lossless queues are supported on a port. If the number of lossless queues configured
exceeds the maximum supported limit per port (two), an error message displays. You must
reconfigure the value to a smaller number of queues.
• If you configure lossless queues on an interface that already has a DCB map with PFC enabled (pfc
on), an error message displays.
Data Center Bridging (DCB)
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