Configure Lldp/Dcbx For The Iscsi Tlv - Dell QMD8262-k User Manual

3–Adapter Management Applications
Configuring iSCSI over DCBX
swd77(conf-ceemap)#priority-table 6 6 6 6 6 6 6 7
swd77(conf-ceemap)#exit

Configure LLDP/DCBX for the iSCSI TLV

The following commands configure link layer discovery protocol (LLDP) for the
iSCSI type-length-value (TLV).
1. Configure the LLDP:
swd77(config)#protocol lldp
2. Enable the LLDP:
swd77(conf-lldp)#no disable
3. Advertise DCBX TLV in the LLDP:
swd77(conf-lldp)#advertise dcbx-tlv
4. Advertise iSCSI over DCBX in the LLDP:
swd77(conf-lldp)#advertise dcbx-iscsi-app-tlv
swd77(conf-lldp)#exit
When you use the Linux lldptool to enable the link layer discovery protocol (LLDP)
management type-length-value (TLV) from the host, data center bridging (DCB)
becomes disabled.
Cause: Even when the Linux driver indicates that LLDP is managed by another
entity (for example, if LLDP is managed by the adapter firmware, and the driver
capability has the DCBX_CAP_LLDP_MANAGED flag), the LLDP Agent Daemon
(lldpad) reads local values from its config file rather than from the driver. This
misread causes lldpad to send different values than the adapter firmware sends.
The incorrect values lead to a multiple LLDP neighbors condition, and according
to the DCB Capability Exchange Protocol Base Specification, data center bridging
exchange (DCBX) is disabled when this condition is true.
Fix: If the driver capability has the DCBX_CAP_LLDP_MANAGED flag, lldpad
should either read all values from the driver through dcbnl_ops, or it should send
non-DCB TLVs. The lldpad has been fixed to address the issue using the
non-DCB TLV option. The fix is available in the latest lldpad and lldptool, which
you can download from the following Web site:
http://open-lldp.org/git/?p=open-lldp.git;a=shortlog
To obtain the latest code from the Web site's tree, click snapshot to save the
source code to a setup. Use the code to build, install, and test lldpad and lldptool
on the setup.
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