300-610 · Question #245
Refer to the exhibit. A Cisco engineer is implementing a customer data center design and must configure Cisco MDS 9000 Series Switches. The configuration has the required IP addresses on each SAN. The
The correct answer is C. control and data connection. For FCIP QoS on Cisco MDS 9000 Series Switches, DSCP values are needed to mark IP packets, specifically differentiating between control and data connections to ensure proper prioritization.
Question
Refer to the exhibit. A Cisco engineer is implementing a customer data center design and must configure Cisco MDS 9000 Series Switches. The configuration has the required IP addresses on each SAN. The requirement is that each FCIP is a separate E (ISL), and the FCIP links must connect to different switches across the two SAN islands. Also, the Fibre Channel traffic is to be load-balanced across the FCIP link. After the engineer configures the FCIP profiles and interfaces, they want to enable QoS for the link. Which types of values are needed for the DSCP to mark the IP packets?
Exhibit
Options
- AE (ISL) and GE peer ports speed
- Bport channel and F-ports
- Ccontrol and data connection
- Dretransmit and keepalive timeout
How the community answered
(33 responses)- A3% (1)
- B12% (4)
- C76% (25)
- D9% (3)
Why each option
For FCIP QoS on Cisco MDS 9000 Series Switches, DSCP values are needed to mark IP packets, specifically differentiating between control and data connections to ensure proper prioritization.
E (ISL) and GE peer ports speed refer to port types and bandwidths, which are physical attributes, not QoS marking values for DSCP.
Port channel and F-ports describe link aggregation and Fibre Channel port roles, respectively, and are not related to DSCP marking values for QoS.
When enabling QoS for FCIP links, DSCP values are used to mark IP packets, separating 'control' traffic (e.g., protocol signaling, keepalives) from 'data' traffic (Fibre Channel frames). This allows for differentiated treatment and prioritization of critical control plane traffic over bulk data traffic to maintain link stability and performance.
Retransmit and keepalive timeout are parameters for FCIP session reliability and liveliness detection, not values used for classifying and marking IP packets for QoS.
Concept tested: FCIP QoS DSCP marking
Source: https://www.cisco.com/c/en/us/td/docs/dcn/mds9000/nx-os/10x/configuration/guide/fcip-features/b-nx-os-fcip-features-configuration-guide-10x/fcip-qos.html
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