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DHCP Commands
15-108 Configuring DHCP
61
*
Client-
Identifier
Basic/String - A DHCP client’s unique identifier. DHCP servers use this value to index their
database of address bindings. This value is expected to be unique for all
clients in an administrative domain.
Length: 2-octet minimum
CLI command: ip address dhcp
64 NIS+
Domain
Servers/
ASCII string
- Name of the client's NIS+ domain.
Length: 4-octet minimum
65 NIS+
Servers
Servers/IP
address list
- IP addresses indicating NIS+ servers available to a client. List in order of
preference.
Length: 4-octet minimum; multiples of 4
67 Bootfile
name
BOOTP/
String
- Identifies a bootfile name when when the file field in the DHCP header has
been used for DHCP options.
Length: 1-octet minimum
68 Mobile IP
Home
Agent
Servers/IP
address list
- IP addresses indicating mobile IP home agents available to a client. List
agents in order of preference.
Length: 4-octet minimum; multiples of 4
69 SMTP
Server
Servers/IP
address list
- SMTP servers available to a client. List in order of preference.
Length: 4-octet minimum; multiples of 4
70 POP3
Server
Servers/IP
address list
- POP3 servers available to a client. List in order of preference.
Length: 4-octet minimum; multiples of 4
71 NNTP
Server
Servers/IP
address list
- NNTP servers available to a client. List in order of preference.
Length: 4-octet minimum; multiples of 4
72 Default
WWW
Server
Servers/IP
address list
- WWW servers available to a client. List in order of preference.
Length: 4-octet minimum; multiples of 4
73 Default
Finger
Server
Servers/IP
address list
- Finger servers available to a client. List in order of preference.
Length: 4-octet minimum; multiples of 4
74 Default IRC
Server
Servers/IP
address list
- IRC servers available to a client. List in order of preference.
Length: 4-octet minimum; multiples of 4
75 StreetTalk
Server
Servers/IP
address list
- StreetTalk servers available to a client. List in order of preference.
Length: 4-octet minimum; multiples of 4
76 STDA
Server
Servers/IP
address list
- STDA servers available to a client. List in order of preference.
Length: 4-octet minimum; multiples of 4
82 DHCP
Relay
Agent
Information
DHCP Relay/
String
-This helper option is used in an environment where DHCP Relay is co-located
with circuit access equipment (DSL and cable-based LANs) to reduce
broadcasts, prevent IP spoofing, client ID spoofing, and MAC address
spoofing. Defined by RFC-3046.
Length: Variable
90 DHCP
Authentica-
tion
DHCP
Protocol/
Structured
Data
- Mechanism for authenticating DHCP messages, clients and servers. Based on
HMAC-MD5.
Defined by RFC-3118.
Length: Variable; minimum 11 octets
Table 15-1 XSR-Supported DHCP Options (continued)
#
Protocol
Name
Category/
Type
Default Description