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200-150 · Question #163

To witch component do you connect the Layer 1 port of a fabric interconnect?

The correct answer is A. Layer 2 port of the opposite fabric interconnect. In a Cisco UCS two-FI cluster, the L1 port on one fabric interconnect cross-connects to the L2 port on the opposite fabric interconnect to form the cluster peer link.

Cisco Data Center Unified Computing

Question

To witch component do you connect the Layer 1 port of a fabric interconnect?

Options

  • ALayer 2 port of the opposite fabric interconnect
  • Bout-of band management network
  • CLayer 2 port of the same fabric interconnect
  • DLayer 1 port of the opposite fabric interconnect

How the community answered

(43 responses)
  • A
    91% (39)
  • B
    2% (1)
  • C
    2% (1)
  • D
    5% (2)

Why each option

In a Cisco UCS two-FI cluster, the L1 port on one fabric interconnect cross-connects to the L2 port on the opposite fabric interconnect to form the cluster peer link.

ALayer 2 port of the opposite fabric interconnectCorrect

Cisco UCS fabric interconnects use dedicated cluster ports labeled L1 and L2 to establish the high-availability peer link between the two FIs. The L1 port on FI-A must connect to the L2 port on FI-B (and correspondingly L2 on FI-A to L1 on FI-B), creating a symmetric cross-connection that enables cluster heartbeat, state synchronization, and failover coordination between the two interconnects.

Bout-of band management network

The out-of-band management network connects to the dedicated MGMT0 Ethernet port on the fabric interconnect, not to the L1 cluster port.

CLayer 2 port of the same fabric interconnect

The L1 port connects to a port on the opposite fabric interconnect, not to any port on the same FI; the cluster link must span both physical FI units.

DLayer 1 port of the opposite fabric interconnect

The correct pairing is L1 to L2 (cross-connection), not L1 to L1; connecting two L1 ports together does not conform to the Cisco UCS cluster cabling specification.

Concept tested: Cisco UCS fabric interconnect cluster port cabling

Source: https://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/hw/fabric-interconnect-installation/b_Cisco_UCS_6400_FI_Install_Guide/b_Cisco_UCS_6400_FI_Install_Guide_chapter_0100.html

Topics

#fabric interconnect#UCS connectivity#Layer 1 port#FI clustering

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