CHAPTER 8: ACCESS USING TACACS+ ACCESS USING TACACS+
MULTILINK ML1200 MANAGED FIELD SWITCH – INSTRUCTION MANUAL 8–3
FIGURE 8–2: TACACS packet format
The portions of the TACACS packet are defined as follows:
• Major Version: The major TACACS+ version number.
• Minor version: The minor TACACS+ version number. This is intended to allow
revisions to the TACACS+ protocol while maintaining backwards compatibility.
• Packet type: Possible values are:
• TAC_PLUS_AUTHEN:= 0x01 (authentication)
TAC_PLUS_AUTHOR:= 0x02 (authorization)
TAC_PLUS_ACCT:= 0x03 (accounting)
• Sequence number: The sequence number of the current packet for the current
session.
• Flags: This field contains various flags in the form of bitmaps. The flag values
signify whether the packet is encrypted.
• Session ID: The ID for this TACACS+ session.
• Length: The total length of the TACACS+ packet body (not including the header).
754717A1.CDR
32 bits wide
4 4 8 8 8 bits
Major
Version
Minor
Version
Packet type Sequence
number
Flags
Session ID
Length
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