Dell PS-M4110 Technical Information download pdf (Page 144)

March 2013 Dell EqualLogic Configuration Guide v14.1 14-135

Figure 51 M1000e Blade Enclosure full DCB solution

The components used in the solution are listed here:

• M1000e chassis

• M620 blade server

• PS-M4110XV array

• Force10 MXL (2)

• Broadcom 57810 CNA

14.7 VLANs for iSCSI

A non-default VLAN is required for operating prioritized lossless iSCSI traffic in a DCB enabled Ethernet

infrastructure. Switch ports that are based on the IEEE 802.1Q VLAN specification forward frames in

the default or native VLAN without tags (untagged frames). Normally these ports also receive frames in

the default or native VLAN as untagged. Such a port is typically termed a “tagged port” or “trunk port”

and all non-default VLAN frames are forwarded with the tags intact. Since the DCB priority information

(PCP value) is encoded in the VLAN tag, this information will be lost if an end-device sends iSCSI traffic

in a default or native VLAN and the switch receives it in a tagged or trunk port. As a result, DCB

prioritization and traffic classification will be lost.

All devices in the iSCSI data path must have the same VLAN ID configured on the respective ports

participating in the iSCSI network to ensure proper functioning. These devices include the server iSCSI

NIC/CNA ports, EqualLogic arrays, and all switches on the iSCSI SAN.

Note: The VLAN ID for iSCSI can be set in the EqualLogic Group Manager interface or the

storage array CLI. When DCB is enabled on the switch, it is necessary to configure a non-

default VLAN on the array, switch, and all host ports that are part of the EqualLogic SAN.

VLAN IDs 0 and 1 are not recommended, because these may be the default or reserved

VLAN for some switches, and as such, may forward frames untagged (e.g. no VLAN

tagging). VLAN tagging is required to fully support DCB.

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Dell PS-M4110 Technical Information Page 144