H3C Technologies H3C S7500E Series Switches - Manual (Page 19)

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2) The Identifier field (1-byte long) is for matching request packets and response packets and
detecting retransmitted request packets. The request and response packets of the same type
have the same identifier.
3) The Length field (2-byte long) indicates the length of the entire packet, including the Code,
Identifier, Length, Authenticator, and Attribute fields. The value of the field is in the range 20 to
4096. Bytes beyond the length are considered the padding and are neglected upon reception. If
the length of a received packet is less than that indicated by the Length field, the packet is
dropped.
4) The Authenticator field (16-byte long) is used to authenticate replies from the RADIUS server and
encrypt user passwords. There are two types of authenticators: request authenticator and
response authenticator.
5) The Attribute field, with a variable length, carries the specific authentication, authorization, and
accounting information for defining configuration details of the request or response. This field
contains multiple attributes, and each attribute is represented in triplets of Type, Length, and
Value.
z Type: One byte, in the range 1 to 255. It indicates the type of the attribute. Commonly used
attributes for RADIUS authentication, authorization and accounting are listed in Table 1-2 .
z Length: One byte for indicating the length of the attribute (including the Type, Length, and Value
fields), in bytes.
z Value: Value of the attribute, up to 253 bytes. Its format and content depend on the Type and
Length fields.
Table 1-2 RADIUS attributes
No. Attribute No. Attribute
1 User-Name 45 Acct-Authentic
2 User-Password 46 Acct-Session-Time
3 CHAP-Password 47 Acct-Input-Packets
4 NAS-IP-Address 48 Acct-Output-Packets
5 NAS-Port 49 Acct-Terminate-Cause
6 Service-Type 50 Acct-Multi-Session-Id
7 Framed-Protocol 51 Acct-Link-Count
8 Framed-IP-Address 52 Acct-Input-Gigawords
9 Framed-IP-Netmask 53 Acct-Output-Gigawords
10 Framed-Routing 54 (unassigned)
11 Filter-ID 55 Event-Timestamp
12 Framed-MTU 56-59 (unassigned)
13 Framed-Compression 60 CHAP-Challenge