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Cisco Bug: CSCvu06641 - tacacs+ single connection packet flow

Last Modified

Sep 10, 2020

Products (63)

  • Cisco IOS
  • Cisco Catalyst 9300-48UXM-A Switch
  • Cisco Catalyst 9300-48U-A Switch
  • Cisco Catalyst 9300-48P-A Switch
  • Cisco Catalyst 9300L Switch Stack
  • Cisco Catalyst 9300L-48P-4G-E Switch
  • Cisco Catalyst 9300L-48P-4X-A Switch
  • Cisco Catalyst 9300-48T-A Switch
  • Cisco Catalyst 9800-40 Wireless Controller
  • Cisco Catalyst C9500-16X-E Switch
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Known Affected Releases


Description (partial)

the single connection flag is not set on first authentication packet sent by the switch , AAA server response set this flag , but the switch never set the flag to establish the single connection as per :

for Command authorization we see new connections (new TCP 3 way handshake) 

but accounting and shell authorization work with the same existing connection (no 3 way handshake)

switch and AAA server are configured for single connection 

switch configuration :
tacacs server ISE-TEST
 address ipv4  x.x.x.x
 key 7 <removed>
 timeout 1
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