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AAM1212-51/53 Series User’s Guide
Chapter 25 DHCP Relay
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H A P T E R
25
DHCP Relay
This chapter shows you how to set up DHCP relays for each VLAN.
25.1 DHCP Relay
DHCP (Dynamic Host Configuration Protocol, RFC 2131 and RFC 2132) allows individual
clients to obtain TCP/IP configuration at start-up from a DHCP server. You can configure the
AAM1212 to relay DHCP requests to one or more DHCP servers and the server’s responses
back to the clients. You can specify default DHCP servers for all VLAN, and you can specify
DHCP servers for each VLAN.
25.2 DHCP Relay Agent Information Option (Option 82)
The AAM1212 can add information to DHCP requests that it relays to a DHCP server. This
helps provide authentication about the source of the requests. You can also specify additional
information for the AAM1212 to add to the DHCP requests that it relays to the DHCP server.
Please see RFC 3046 for more details.
25.2.1 DHCP Relay Agent Circuit ID and Remote ID Sub-option
Formats
The DHCP relay agent information feature adds an Agent Information field to the option 82
field of the DHCP headers of DHCP request frames that the AAM1212 relays to a DHCP
server. The Agent Information field that the AAM1212 adds contains an “Agent Circuit-ID
sub-option” that includes the port number, VLAN ID and optional information about the port
where the DHCP request was received.
The following figure shows the format of the Agent Circuit ID sub-option. The 1 in the first
field identifies this as an Agent Circuit ID sub-option. The length N gives the total number of
octets in the Agent Information Field. If the configuration request was received on a DSL port,
a 2-byte Port No field specifies the ingress port number (the first byte is always 0, the second
byte is in hexadecimal format). The next field is 2 bytes and displays the DHCP request
packet’s VLAN ID. The last field (A) can range from 0 to 24 bytes and is optional information
(that you specify) about this relay agent.
Figure 92
DHCP Relay Agent Circuit ID Sub-option Format
Содержание AAM1212-51
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Страница 100: ...AAM1212 51 53 Series User s Guide 100 Chapter 12 ENET Port Setup...
Страница 132: ...AAM1212 51 53 Series User s Guide 132 Chapter 14 xDSL Profiles Setup...
Страница 140: ...AAM1212 51 53 Series User s Guide 140 Chapter 15 xDSL Line Data...
Страница 148: ...AAM1212 51 53 Series User s Guide 148 Chapter 16 VLAN...
Страница 166: ...AAM1212 51 53 Series User s Guide 166 Chapter 19 Multicast VLAN...
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Страница 198: ...AAM1212 51 53 Series User s Guide 198 Chapter 27 2684 Routed Mode...
Страница 204: ...AAM1212 51 53 Series User s Guide 204 Chapter 28 PPPoA to PPPoE...
Страница 220: ...AAM1212 51 53 Series User s Guide 220 Chapter 33 Syslog...
Страница 228: ...AAM1212 51 53 Series User s Guide 228 Chapter 34 Access Control...
Страница 238: ...AAM1212 51 53 Series User s Guide 238 Chapter 36 Alarm...
Страница 246: ...AAM1212 51 53 Series User s Guide 246 Chapter 38 Diagnostic...
Страница 270: ...AAM1212 51 53 Series User s Guide 270 Chapter 41 Commands...
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Страница 286: ...AAM1212 51 53 Series User s Guide 286 Chapter 43 Alarm Commands...
Страница 328: ...AAM1212 51 53 Series User s Guide 328 Chapter 48 Packet Filter Commands...
Страница 334: ...AAM1212 51 53 Series User s Guide 334 Chapter 49 IP Commands...
Страница 344: ...AAM1212 51 53 Series User s Guide 344 Chapter 51 SNMP...
Страница 380: ...AAM1212 51 53 Series User s Guide 380 Chapter 52 ADSL Commands...
Страница 406: ...AAM1212 51 53 Series User s Guide 406 Chapter 53 Virtual Channel Management...
Страница 412: ...AAM1212 51 53 Series User s Guide 412 Chapter 54 ACL Commands...
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