300-170 · Question #81
You have a server that has a Cisco UCS CNA. A service profile that has a vNIC and a vHBA is mapped to fabric A. The vNIC is configured to use VLAN 10. VLAN 10 is the native VLAN for the vNIC. The…
The correct answer is A. VSAN 3 can be configured by using VLAN 10 as the FCoE VLAN ID. In FCoE, an FCoE VLAN ID is used to carry Fibre Channel traffic over Ethernet, and this ID is independent of a vNIC's native VLAN, meaning the same VLAN ID can be used for different purposes.
Question
You have a server that has a Cisco UCS CNA. A service profile that has a vNIC and a vHBA is mapped to fabric A. The vNIC is configured to use VLAN 10. VLAN 10 is the native VLAN for the vNIC. The vHBA is configured to use VSAN 2. Which description of the configuration is true?
Options
- AVSAN 3 can be configured by using VLAN 10 as the FCoE VLAN ID
- BVSAN 2 can read traffic on VLAN 5.
- CVLAN 10 and VSAN 2 must use the same ID
- DVSAN 2 can be mapped to other VLANs in fabric A.
How the community answered
(32 responses)- A75% (24)
- B16% (5)
- C6% (2)
- D3% (1)
Why each option
In FCoE, an FCoE VLAN ID is used to carry Fibre Channel traffic over Ethernet, and this ID is independent of a vNIC's native VLAN, meaning the same VLAN ID can be used for different purposes.
An FCoE VLAN ID is an Ethernet VLAN tag designated to carry Fibre Channel over Ethernet traffic for a specific VSAN. While VLAN 10 is currently used as the native VLAN for a vNIC's data traffic, it can also be designated as the FCoE VLAN ID for a different VSAN (like VSAN 3) because these are distinct logical uses of the same VLAN identifier.
VSANs are logical domains for Fibre Channel traffic, while VLANs are for Ethernet traffic; they operate independently, and a VSAN cannot directly 'read traffic' on an arbitrary data VLAN.
There is no requirement for a Fibre Channel VSAN ID and an Ethernet VLAN ID to be numerically identical, as FCoE provides the encapsulation and mapping between them.
Each VSAN is typically mapped to a single FCoE VLAN ID on a given Fabric Interconnect for its transport and does not get mapped to multiple different VLANs for its own traffic.
Concept tested: FCoE VLAN and VSAN relationship
Source: https://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/sw/gui/config/guide/3-1/b_ucs_gui_config_guide_3_1/b_ucs_gui_config_guide_3_1_chapter_010000.html
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