Exam 350-601 topic 1 question 56 discussion

I think it is option A. Refer 6.4 and 6.5. Sid/did uses same link for particular flow between source id/ dest id. Exchange based uses same link for specific exchange and not for specific flow.

Traffic belonging to the same exchange (identified by the same src-id, dst-id, and OXID) will follow the same link within the aggregated group. However, different exchanges between the same source and destination pair can potentially use different links.

A is the correct answer - flow based instead of exchange based

Why src-id/dst-id/oxid is the Correct Choice Components: src-id: The source Fibre Channel ID. dst-id: The destination Fibre Channel ID. oxid: The Exchange ID, which identifies specific Fibre Channel exchanges. Behavior: The src-id/dst-id/oxid load-balancing method ensures that frames for the same exchange (same oxid) between a source and destination (src-id and dst-id) follow the same link. Other flows (different oxid values) can use different links, optimizing bandwidth utilization. Use Case: This method is ideal for Fibre Channel environments where maintaining in-order delivery of frames for specific flows is essential.

This was one of the questions in pluralsight by Sean Douglas

After reading comments, i now agree it is A. the questions specifically reflects flow and not exchange.

flow based is A exchange based is D so for this question is A

Load balancing is based on the source ID, destination ID, and exchange ID (OX ID). Load-balancing functionality on SAN port channels can be provided using the following methods: ■■ Flow based: All frames between source and destination follow the same links for a given flow. That is, whichever link is selected for the first exchange of the flow is used for all subsequent exchanges. ■■ Exchange based: The first frame in an exchange is assigned to a link, and then subsequent frames in the exchange follow the same link. However, subsequent exchanges can use a different link. This method provides finer granularity for load balancing while preserving the order of frames for each exchange. D is correct

Definitely D

This load balancing method is often referred to as "Source ID/Destination ID" or "src-dst-id." It uses the source and destination identifiers (IDs) to determine which link to use for a specific flow. It ensures that frames between a specific source and destination follow the same links for that specific flow. This is a common load balancing method in Fibre Channel networks.

To ensure that frames between the source and the destination follow the same links for a specific flow, while subsequent flows are allowed to use a different link on a Cisco MDS 9000 Series Switch that uses port channels, the load balancing method that should be used is "src-dst-oxid". The "src-dst-oxid" load balancing method uses the source and destination Fibre Channel ID and exchange ID (OXID) to determine which link in the port channel to use. This method ensures that frames between the same source and destination always follow the same path in the port channel, while subsequent flows can use a different link. Option A, "src-id/dst-id", uses the source and destination Fibre Channel IDs to determine which link in the port channel to use, but it does not consider the exchange ID (OXID). ource and destination port to determine which link in the port channel to use, but it does not consider the exchange ID (OXID). Therefore, the correct option is D, "src-id/dst-id/oxid".

A. src-id/dst-id Flow based—All frames between source and destination follow the same links for a given flow. That is, whichever link is selected for the first exchange of the flow is used for all subsequent exchanges.

A is correct. Option D refers to exchanged-based LB. This means that traffic between the same source and same destination can use another link if they're in another exchange. The question states clearly that the same link must be used at all times. So no exchange-based LB must be used.

A is correct Key point to look out for is flow vs exchange. One flow can have multiple exchanges.

d is correct

D is correct. Bcs in the method flow based every time there is a source and a destination we use the same link, the identifiers will be src and dest On the exchange based (the one mentioned in the question) we want just that one exchange (oxid) to use a specific link, then the link is "tracked" by the parameters src-id, dst-id and oxid

I think it's A as well: https://www.cisco.com/en/US/docs/storage/san_switches/mds9000/sw/rel_1_x/1_3/san-os/configuration/guide/PortChnl.pdf