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Cisco Bug: CSCur27501 - Disable r-DNS lookup for SSH/Telnet

Last Modified

Sep 11, 2019

Products (9)

  • Cisco Nexus 5000 Series Switches
  • Cisco Nexus 5548P Switch
  • Cisco Nexus 5596UP Switch
  • Cisco Nexus 6004 Switch
  • Cisco Nexus 5672UP Switch
  • Cisco Nexus 6001 Switch
  • Cisco Nexus 5548UP Switch
  • Cisco Nexus 56128P Switch
  • Cisco Nexus 5596T Switch

Known Affected Releases

7.0(2)N1(1)

Description (partial)

Symptom:
Nexus 5000/5500 takes some time to show the login prompt, when accessed through a telnet or ssh session.

Conditions:
This happens, since chassis actually performs reverse DNS lookup for the PC/Host's IP address and it takes almost 40 seconds before the user gets prompt.
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
  • Number of Related Support Cases
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