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Cisco Bug: CSCtb58282 - show tcp brief can cause crash

Last Modified

Jan 28, 2017

Products (17)

  • Cisco IOS
  • Cisco Catalyst 6500 Series Virtual Switching Supervisor Engine 720 with 10GE uplinks
  • Cisco Products
  • Cisco Catalyst 6500 Supervisor Engine 32 PISA
  • Cisco Catalyst 6500 Series Supervisor Engine 2
  • Cisco 10720 Router
  • Cisco Catalyst 6000 Series Multilayer Switch Feature Card 3 (MSFC3)
  • Cisco 7600 Series Supervisor Engine 2 with Multilayer Switch Feature Card
  • Cisco Catalyst 6513 Switch
  • Cisco Catalyst 6000 Multilayer Switch Feature Card MSFC2
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Known Affected Releases


Description (partial)

Symptoms: A device running Cisco IOS may reload when the <CmdBold>show tcp 
brief<noCmdBold> command is issued.

Conditions: This symptom is observed under the following conditions:
1.ip domain lookup" is configured (it is on by default)
2. the ip address of the foreign host in the tcp session has a very long 
domain name associated with it (on the order of 70 characters).
3. the port number of the foreign host is 5 digits long.

If ip domain lookup is disabled, the problem could still happen if the host 
has a static entry configured via the <CmdBold>ip host<noCmdBold> command.
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Bug Details Include

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