Which two chassis discovery policy settings allow far a UCS chassis to be connected to a pair of Fabric Interconnect using only two physical connections?

Which two chassis discovery policy settings allow far a UCS chassis to be connected to a pair of Fabric Interconnect using only two physical connections? (Choose two)
A. 4-link
B. 2-link
C. 8-link
D. 1-link
E. Platform-max

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9 thoughts on “Which two chassis discovery policy settings allow far a UCS chassis to be connected to a pair of Fabric Interconnect using only two physical connections?

  1. Look at Table 1 at this URL, and look at the row that says “2 Links.” As you follow that row from left to right, you’ll see that only two columns say “Chassis is discovered.” Check those two column headers at the top of the table.

    https://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/ucs-manager/GUI-User-Guides/Infrastructure-Mgmt/3-1/b_UCSM_GUI_Infrastructure_Management_Guide_3_1/b_UCSM_GUI_Infrastructure_Management_Guide_3_1_chapter_01.html

  2. This is not even a topic for debate. The setting dictates the minimum number of links allowed. So if you only have two links, you can’t have a setting where the minimum is more than 2 links! Only 1-link and 2-link will work. Platform max is either 4 or 8 (whatever number of ports are on the FEX) so again, not possible. If you only have two cables, you can only succeed if the minimum is 2, or the minimum is 1. If the minimum is 4, for example, then two cables will fail.

    1. Also, the question is misworded. They don’t mean two cables total, they mean two per fabric. When discussing this topic, uplinks in UCS documentation are ALWAYS cites as the number per FEX. If there were only two cables total, then D would be the ONLY possible right answer, since any setting of 2-link and higher requires at least two cables per FI.

  3. I acknowledge what BrownCow pointed out. However, if this question appears on the exam, I would choose D and E, i.e., I would agree what Anton said.

  4. Hi Anton. This is a confusing question but I don’t think “platform-max” will work here. The tip is confusing and may have been updated by Cisco but this is what I see now:

    “To establish the highest available chassis connectivity in a Cisco UCS domain where Fabric Interconnect is connected to different types of IO Modules supporting different max number of uplinks, select platform max value. Setting the platform max ensures that Cisco UCS Manager discovers the chassis including the connections and servers only when the maximum supported IOM uplinks are connected per IO Module.”

    This to me says that the system will prevent discovery when less than the maximum number of links that the I/O module supports are configured. So for this question it says only one link per IOM. Thats not the max that the IOM supports so paltform-max would not work. It even shows this in table 1.

    That being said i dont see how answer B-2 link is going to work here either if its one link per fabric interconnect.

    https://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/ucs-manager/GUI-User-Guides/Infrastructure-Mgmt/3-1/b_UCSM_GUI_Infrastructure_Management_Guide_3_1/b_UCSM_GUI_Infrastructure_Management_Guide_3_1_chapter_01.html

  5. Guys, you ain’t reading the doc right:

    D and E are correct – a total of 2 physical connections to two interconnects, means that a single interconnect will see one link and policy should be set to a minimum number of links. Another answer is ciscos tip – platform max.

    If you have a Cisco UCS domain that has some chassis wired with 1 link, some with 2 links, some with 4 links, and some with 8 links we recommend that you configure the chassis discovery policy for the minimum number links in the domain so that Cisco UCS Manager can discover all chassis.

    Tip:
    For Cisco UCS implementations that mix IOMs with different numbers of links, we recommend using the platform max value. Using platform max ensures that Cisco UCS Manager uses the maximum number of IOM uplinks available.

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