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200-155 · Question #58

A network engineer is configuring a pair of 6248 Fabric Interconnects, each with dual 10G uplinks to a parent switch. One design requirement is to ensure a specific server is able to use 10G of…

The correct answer is A. LAN Pin Groups. LAN Pin Groups in Cisco UCS ensure a specific server receives dedicated 10G throughput by exclusively mapping its vNIC to a physical uplink or uplink port-channel, preventing contention.

Unified Computing System

Question

A network engineer is configuring a pair of 6248 Fabric Interconnects, each with dual 10G uplinks to a parent switch. One design requirement is to ensure a specific server is able to use 10G of throughput to the LAN without contention from other servers within the 5108 chassis. Which technology will accomplish this?

Options

  • ALAN Pin Groups
  • BPort-Channels
  • CSystem QoS Policy
  • DUnified Ports

How the community answered

(27 responses)
  • A
    70% (19)
  • B
    19% (5)
  • C
    7% (2)
  • D
    4% (1)

Why each option

LAN Pin Groups in Cisco UCS ensure a specific server receives dedicated 10G throughput by exclusively mapping its vNIC to a physical uplink or uplink port-channel, preventing contention.

ALAN Pin GroupsCorrect

LAN Pin Groups in Cisco UCS allow you to specify which physical uplinks or uplink port-channels a vNIC or a set of vNICs can use for northbound traffic. By creating a dedicated LAN Pin Group that maps a server's vNIC to an exclusive 10G uplink, that server can utilize the full 10G throughput without contention from other servers' traffic sharing a common uplink.

BPort-Channels

Port-Channels aggregate multiple physical links to increase overall bandwidth and provide redundancy, but they do not inherently guarantee dedicated bandwidth for a *single* server if multiple servers share the same port-channel.

CSystem QoS Policy

System QoS Policy can prioritize traffic but does not guarantee an entire 10G of *non-contended* throughput for a single server; it manages how bandwidth is shared under contention rather than exclusively allocating it.

DUnified Ports

Unified Ports in Cisco UCS refer to ports that can be configured as either Fibre Channel or Ethernet, which is a hardware capability and does not directly address bandwidth isolation for a server.

Concept tested: Cisco UCS LAN Pin Groups for bandwidth isolation

Source: https://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/sw/gui/config/guide/2-0/b_UCSM_GUI_Configuration_Guide_2_0/b_UCSM_GUI_Configuration_Guide_2_0_chapter_01001.html

Topics

#Cisco UCS#Fabric Interconnect#LAN Pin Groups#network throughput#QoS

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