debug ipv6 tcp

Please confirm command desciption and let me know if anything needs to be added here
Displays debugging information about IPv6 Transmission Control Protocol (TCP) transactions.
Syntax
debug ipv6 tcp adjust-mss
debug ipv6 tcp status ipv6-address
debug ipv6 tcp vrf vrf-name [ status ipv6-address ]
no debug ipv6 tcp adjust-mss
no debug ipv6 tcp status ipv6-address
no debug ipv6 tcp vrf vrf-name [ status ipv6-address ]
Parameters
Please confirm below descriptions
adjust-mss
Specifies IPv6 TCP MSS debugging.
status ipv6-address
Specifies the status for TCP connections.
vrf vrf-name
Specifies a non-default VRF instance.
Modes

Privileged EXEC mode

Usage Guidelines
Please confirm

The no form of the command disables IPv6 TCP debugging options.

Examples
Please supply an example

The following example displays debugging information about TCP transactions. 

device# debug ipv6 tcp
The following example displays debugging information about IPv6 TCP status.
device# debug ipv6 tcp status 2021:17::1:1:2 8028 2021:17::1:1:1 179 
TCP: TCB = 0xa4139619 
TCP: 2021:17::1:1:2:8028 <-> 2021:17::1:1:1:179: state: ESTABLISHED
  Send: initial sequence number = 17791259 
  Send: first unacknowledged sequence number = 18110620 
  Send: current send pointer = 18110620 
  Send: next sequence number to send = 18110620 
  Send: remote received window = 16384 
  Send: total unacknowledged sequence number = 0 
  Send: last window update sequence number = 154385241 
  Send: last window update ack number = 18110620 
  Send: need to send ack = 0, probe = 0
  Send: total used buffers 0 
  Receive: initial incoming sequence number = 154039983 
  Receive: expected incoming sequence number = 154385260 
  Receive: received window = 16384 
  Receive: bytes in receive queue = 0 
  Receive: congestion window = 1420 
    TCP Connection state: ESTABLISHED, timer state 0
     TCP Keychain name      : 1
     TCP-AO Enabled         : YES
     TCP-AO in use          : YES
     Keychain valid         : YES
     No of segments dropped : 0
     Send-Active-Key
     ---------------
       Key-id               : 1                                   
       Crypto Algorithm     : AES-128-CMAC
       Send-id              : 100
       Recv-id              : 100
       Include-tcp-options  : YES
       Accept-ao-mismatch   : YES
     Recv-Active-Key
     ---------------
       Key-id               : 1
       Crypto Algorithm     : AES-128-CMAC
       Send-id              : 100
       Recv-id              : 100
       Include-tcp-options  : YES
       Accept-ao-mismatch   : YES

       Maximum segment size: 1420
       Local host:  2021:17::1:1:2, Local  Port: 8028
       Remote host: 2021:17::1:1:1, Remote Port: 179
       ISentSeq:   17791259  SendNext:   18110620  TotUnAck:          0
       TotSent:      319361  ReTrans:           2  UnAckSeq:   18110620
       SeqLastWin:   154385241  AckLastWin:    18110620  SendAck: 0
       IRcvSeq:   154039983  RcvNext:   154385260  SendWnd:       16384
       TotalRcv:     345277  DupliRcv:          0  RcvWnd:        16384
       SendQue:           0  RcvQue:            0  CngstWnd:       1420
The following example displays TCP debugging information for a specific VRF.
device# debug ipv6 tcp vrf blue status 2021:15::1:1:2 179 2021:15::1:1:1 8070
TCP: TCB = 0xa413a0f7 
TCP: 2021:15::1:1:2:179 <-> 2021:15::1:1:1:8070: state: ESTABLISHED
  Send: initial sequence number = 21557428 
  Send: first unacknowledged sequence number = 21876637 
  Send: current send pointer = 21876637 
  Send: next sequence number to send = 21876637 
  Send: remote received window = 16365 
  Send: total unacknowledged sequence number = 0 
  Send: last window update sequence number = 155872258 
  Send: last window update ack number = 21876637 
  Send: need to send ack = 0, probe = 0
  Send: total used buffers 0 
  Receive: initial incoming sequence number = 155526791 
  Receive: expected incoming sequence number = 155872258 
  Receive: received window = 16384 
  Receive: bytes in receive queue = 0 
  Receive: congestion window = 3017 
    TCP Connection state: ESTABLISHED, timer state 0
     TCP Keychain name      : 1
     TCP-AO Enabled         : YES
     TCP-AO in use          : YES
     Keychain valid         : YES
     No of segments dropped : 0
     Send-Active-Key
     ---------------
       Key-id               : 1                                   
       Crypto Algorithm     : AES-128-CMAC
       Send-id              : 100
       Recv-id              : 100
       Include-tcp-options  : YES
       Accept-ao-mismatch   : YES
     Recv-Active-Key
     ---------------
       Key-id               : 1
       Crypto Algorithm     : AES-128-CMAC
       Send-id              : 100
       Recv-id              : 100
       Include-tcp-options  : YES
       Accept-ao-mismatch   : YES

       Maximum segment size: 1420
       Local host:  2021:15::1:1:2, Local  Port: 179
       Remote host: 2021:15::1:1:1, Remote Port: 8070
       ISentSeq:   21557428  SendNext:   21876637  TotUnAck:          0
       TotSent:      319209  ReTrans:           0  UnAckSeq:   21876637
       SeqLastWin:   155872258  AckLastWin:    21876637  SendAck: 0
       IRcvSeq:   155526791  RcvNext:   155872258  SendWnd:       16365
       TotalRcv:     345467  DupliRcv:          0  RcvWnd:        16384
       SendQue:           0  RcvQue:            0  CngstWnd:       3017
History
Release version Command history
09.0.10 This command added TCP keychain (AO) option information to debug ipv6 tcp status and debug ipv6 tcp vrf output.
Parent topic: Debug Commands H - P