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Exam NSE8_811 topic 1 question 5 discussion

Actual exam question from Fortinet's NSE8_811
Question #: 5
Topic #: 1
[All NSE8_811 Questions]

You are building a FortiGate cluster which is stretched over two locations. The HA connections for the cluster are terminated on the local switches in the data centers. Once the FortiGate devices have booted, they do not form a cluster. The network operators inform you that CRC errors are present on the switches where the FortiGate devices are connected.
What should you do to solve this problem?

  • A. Set the speed/duplex setting to 1 Gbps / Full Duplex.
  • B. Replace the cables where the CRC errors occur.
  • C. Place the HA interfaces in dedicated VLANs.
  • D. Change the ethertype for the HA packets.
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Suggested Answer: D 🗳️
by Ghostshell2501 at Sept. 1, 2021, 11:41 a.m.

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aioross
2 years, 6 months ago
Correct: D
upvoted 1 times
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Ghostshell2501
3 years, 8 months ago
https://docs.fortinet.com/document/fortigate/6.0.0/handbook/784034/ethertype-conflicts Some third-party network equipment may use packets with Ethertypes that are the same as the ethertypes used for HA heartbeat packets. For example, Cisco N5K/Nexus switches use Ethertype 0x8890 for some functions. When one of these switches receives Ethertype 0x8890 heartbeat packets from an attached cluster unit, the switch generates CRC errors and the packets are not forwarded. As a result, FortiGates connected with these switches cannot form a cluster. In some cases, if the heartbeat interfaces are connected and configured so regular traffic flows but heartbeat traffic is not forwarded, you can change the configuration of the switch that connects the HA heartbeat interfaces to allow level2 frames with Ethertypes 0x8890, 0x8891, and 0x8893 to pass. You can also use the following CLI commands to change the Ethertypes of the HA heartbeat packets: config system ha set ha-eth-type <ha_ethertype_4-digit_hex> set hc-eth-type <hc_ethertype_4-digit_hex> set l2ep-eth-type <l2ep_ethertype_4-digit_hex> end
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