HP Intelligent Management Center v7.0 VAN Fabric Manager Administrator Guide

Table 5 DCBX parameters
Application of these parameters on the CNAsDCBX parameters on switches
The switch distributes APP, ETS, and PFC parameter values
to attached servers and storage devices.
Enable LLDP.
Enable LLDP globally in the system view, and then enable
LLDP on an specific interface in the interface view to
advertise DCBX TLVs.
After successful negotiation, the server and storage device
include the 802.1p priority expected by the switch in
outgoing FCoE and FIP frames.
APP parameters.
The switch resets the 802.1p priority of received FCoE and
FIP frames to its expected value.
After successful negotiation, the server and storage device
send FCoE and FIP frames at a rate no more than the
ETS parameters.
The switch maps the 802.1p priority of FCoE and FIP
frames to a local precedence value. Then, it assigns the
committed bandwidth of the interface. This prevents packet
loss due to congestion.
two types of frames received on the interface to a WRR
queue based on the local precedence value. The WRR
queue is subject to the configured minimum guaranteed
bandwidth.
After successful negotiation, the server and storage device
enable PFC for the same 802.1p priority.
PFC parameters.
The switch enables PFC for a specific 802.1p priority of
FCoE and FIP frames on the interface connecting to a
server. The switch can thus notify the server to slow down
transmission when congestion occurs.
VFM automatically configure some DCBX parameters, so operators only need to configure the
following parameters:
• ACLs for matching FCoE and FIP frames and for resetting the 802.1p priority of these frames,
class name, behavior name, and QoS policy name.
• Required 802.1p priority
• Local precedence mapped by the 802.1p priority.
• Guaranteed bandwidth for ETS.
• WRR queuing type.
By default, default DCBX parameters are used on all FCoE switches in VFM and their interfaces.
To configure default DCBX parameters:
1. Select the Service tab.
2. From the navigation tree, select VAN Fabric Manager > SAN Configuration > Default DCBX
Params.
3. Click the Advanced Configuration link to configure the following parameters:
• 802.1p Priority—Enters the 802.1p priority for FCoE and FIP frames.
• Local Precedence—Enters the local precedence to which the 802.1p priority is mapped.
A local precedence value corresponds to a WRR queue number.
• Guaranteed Bandwidth for ETS—Selects a percentage of the interface bandwidth consumed
by FCoE and FIP frames. The greater the percentage value, the greater scheduling weight
the WRR queue has.
• ACL Number—Enters the ACL number for matching FCoE and FIP frames. The ACL rules
to match FCoE and FIP frames are generated automatically by VFM.
• Classifier Name—Enters the classifier name to which FCoE and FIP frames belong.
• Behavior Name—Enters the behavior name for resetting the 802.1p priority of FCoE and
FIP frames. The 802.1p priority resetting procedure are triggered automatically by VFM.
34 Managing SANs