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Cisco Bug: CSCun38166 - "no ip arp gleaning tftp and udp" doesn't work

Last Modified

Feb 13, 2018

Products (169)

  • Cisco IOS
  • Cisco Catalyst 3560X-48U-S Switch
  • Cisco Catalyst 3560X-48T-E Switch
  • Cisco Catalyst 2960G-24TC-L Switch
  • Cisco Catalyst 2960C-12PC-L Switch
  • Cisco Catalyst 3750V2-24FS Switch
  • Cisco Catalyst 2960-48TT-S Switch
  • Cisco Catalyst 3560X-48P-S Switch
  • Cisco Catalyst 3560E-48PD-SF Switch
  • Cisco Catalyst 2960S-F48FPS-L Switch
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Known Affected Releases

15.0(2)SE5

Description (partial) 

Symptom:
On 2960,when we configure "no ip arp gleaning tftp" and "no ip arp gleaning udp" then do 
tftp use command"copy flash:teset tftp:"
It is expected following behavior:

1.do not learn a IP address from other segment.
2.add a arp entry corresponding with HSRP virtual mac address 

However in our case,it turns out like below:
1.generate a arp entry of IP address from other segment 
2.add a arp entry corresponding with HSRP PHY mac address.

Conditions:
1.no ip arp gleaning tftp
         OR
  no ip arp gleaning udp
2.do tftp use following command
copy flash:teset tftp:
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Bug Details Include

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