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300-610 · Question #67

Which two methods mitigate congestion in a SAN network? (Choose two.)

The correct answer is A. Configure ER_RDY to allow splitting of each ISL between switches into separate virtual links. D. Configure the port monitor to allow categorization of a specific device as slow.. Extended Receiver Ready - This feature allows each ISL between supporting switches to be split into four separate virtual links, with each virtual link assigned its own buffer-to-buffer credits. Virtual link 0 used to carry control traffic, virtual link 1 is used to carry high-pr

Storage Network Design

Question

Which two methods mitigate congestion in a SAN network? (Choose two.)

Options

  • AConfigure ER_RDY to allow splitting of each ISL between switches into separate virtual links.
  • BUse the port-monitor command to detect slow drain devices.
  • CConfigure the port channel to enable individual buffer-to-buffer credits.
  • DConfigure the port monitor to allow categorization of a specific device as slow.
  • EConfigure the flow control for the FC to use R_RDY.

How the community answered

(44 responses)
  • A
    86% (38)
  • B
    2% (1)
  • C
    5% (2)
  • E
    7% (3)

Explanation

  • Extended Receiver Ready - This feature allows each ISL between supporting switches to be split into four separate virtual links, with each virtual link assigned its own buffer-to-buffer credits. Virtual link 0 used to carry control traffic, virtual link 1 is used to carry high-priority traffic, virtual link 2 is used to carry slow devices, and virtual link 3 is used to carry normal traffic. - Congestion Isolation - This feature allows devices to be categorized as slow by either configuration command or by port monitor. - Port monitor portguard action for Congestion Isolation - Port monitor has a new portguard option to allow the categorization of a device as slow so that it can have all traffic flowing to the device routed to the slow virtual link. co_mds9000_interfaces_config_guide_8x/congestion_avoidance_isolation.html

Topics

#SAN congestion#Flow control#Slow drain devices#Fibre Channel

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