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Cisco Bug: CSCvs77605 - DNS nslookup command via INBAND on switches return "connection timeout" failure

Last Modified

Aug 24, 2020

Products (1)

  • Cisco Nexus 9000 Series Switches

Known Affected Releases

14.1(2g) 14.2(3j)

Description (partial)

Symptom:
Customer could not resolve domain name by using nslookup command via inband EPG on switches, below error message will be returned. 

leaf101# nslookup vm1.cisco.com 192.168.66.1
;; connection timed out; no servers could be reached

The reason is, As we could not specify VRF while issuing the nslookup command, DNS traffic is getting Sent To DNS server via OOB interface instead of In-Band with In-Band EPG Preference Set; 

However iping works fine as we can specifying the correct VRF.

Conditions:
Using Inband for DNS
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
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