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Exam 350-601 topic 1 question 359 discussion

Actual exam question from Cisco's 350-601

Question #: 359
Topic #: 1

A network engineer must configure a Fibre Channel interface on the Cisco MDS 9000 Series Switch. The configuration must meet these requirements:
• The interface must be disabled when the bit errors threshold is exceeded.
• Buffer-to-buffer credits must be set to the maximum value.
• The interface must have full bandwidth allocated for its port group.

Which command set configures a Fibre Channel interface that meets these requirements?

A. interface fc1/1
switchport bit-errors
switchport fcrxbbcredit 220 mode Fx
switchport rate-mode dedicated
B. interface fc1/1
switchport ignore bit-errors
switchport fcrxbbcredit 255 mode Fx
no switchport rate-mode
C. interface fc1/1
no switchport ignore bit-errors
switchport fcrxbbcredit 255 mode Fx
switchport rate-mode dedicated
D. interface fc1/1
no switchport bit-errors
switchport fcrxbbcredit 220 mode Fx
no switchport rate-mode

Show Suggested Answer

Suggested Answer: C 🗳️

by niulf at Feb. 12, 2023, 5:16 a.m.

Comments

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JGBARRIO

Highly Voted 1 year, 9 months ago

It´s C

upvoted 8 times

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niulf

Highly Voted 1 year, 9 months ago

Selected Answer: C

Should it be C?

upvoted 5 times

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GoForCCNP

Most Recent 6 months ago

Selected Answer: C

There's no documentation suggesting maximum value is 220. Maximum value for buffer-to-buffer credits is 255: "For 16-port switching modules and full rate ports, the default value is 16 for Fx mode and 255 for E or TE modes. The maximum value is 255 in all modes. This value can be changed as required." https://www.cisco.com/c/en/us/td/docs/switches/datacenter/mds9000/sw/7_3/configuration/interfaces/cisco_mds9000_interfaces_config_guide_7x/configuring_interface_buffers.html#wp6932207410

upvoted 1 times

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ed27

6 months, 4 weeks ago

Selected Answer: C

Configure the switch to not disable an interface when the threshold is crossed - switchport ignore bit-errors To revert to default, the threshold disables the interface => no switchport ignore bit-errors

upvoted 1 times

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Daimon336

7 months, 2 weeks ago

Selected Answer: A

It is A no switchport ignore bit-errors - Prevents the detection of bit error threshold events from enabling the interface. Not what we are looking for in this question. https://www.cisco.com/en/US/docs/switches/datacenter/nexus5500/sw/san_switching/7x/b_5500_SAN_Switching_Config_7x_chapter_010.html And https://www.cisco.com/c/en/us/support/docs/storage-networking/mds-9513-multilayer-director/210451-fc-port-down-due-to-error-disabled-bi.html

upvoted 1 times

P1Z7C

7 months, 2 weeks ago

CANT'T BE A GO WITH C Buffer-to-Buffer Credits Buffer-to-buffer credits (BB_credits) are a flow-control mechanism to ensure that Fibre Channel switches do not run out of buffers, so that switches do not drop frames. Buffer-to-buffer credits are negotiated on a per-hop basis. The receive buffer-to-buffer credit (fcrxbbcredit) value may be configured for each Fibre Channel interface. In most cases, you do not need to modify the default configuration. The receive buffer-to-buffer credit values depend on the module type and the port mode, as follows: For 16-port switching modules and full rate ports, the default value is 16 for Fx mode and 255 for E or TE modes. The maximum value is 255 in all modes. This value can be changed as required. https://www.cisco.com/c/en/us/td/docs/switches/datacenter/mds9000/sw/7_3/configuration/interfaces/cisco_mds9000_interfaces_config_guide_7x/configuring_interface_buffers.html

upvoted 1 times

ed27

6 months, 4 weeks ago

Daimon336: the Q states: The interface must be disabled when the bit errors threshold is exceeded. So, no switchport ignore bit-errors is exactly what we are looking for. Like you said, it "Prevents the detection of bit error threshold events from enabling the interface"

upvoted 2 times

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erikhara

1 year, 2 months ago

go with C

upvoted 3 times

JCGO

1 year, 1 month ago

Correct. Besides there is no command switchport bit-errors. only no switchport ignore bit-errors

upvoted 2 times

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U_O

1 year, 5 months ago

Correct Answer is A - https://www.cisco.com/c/en/us/support/docs/storage-networking/mds-9513-multilayer-director/210451-fc-port-down-due-to-error-disabled-bi.html You can configure the switch to not disable an interface using below command when the threshold is crossed. By default, the threshold disables the interface. no switchport ignore bit-errors

upvoted 2 times

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redgremlin

1 year, 7 months ago

It is A: The command "switchport bit-errors" in the first line enables bit-error monitoring on the interface. If the bit error threshold is exceeded, the interface will be automatically disabled. The command "switchport fcrxbbcredit 220 mode Fx" sets the buffer-to-buffer credits to the maximum value of 220. The command "switchport rate-mode dedicated" configures the interface to have dedicated bandwidth, which means that the interface will have full bandwidth allocated for its port group.

upvoted 3 times

GoForCCNP

6 months ago

upvoted 1 times

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Rocky_Truth

1 year, 9 months ago

Selected Answer: C

C is correct Ans

upvoted 4 times

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