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Chapter 41 DHCP
XGS-4526/4528F/4728F User’s Guide
364
41.4 DHCP Relay
Configure DHCP relay on the Switch if the DHCP clients and the DHCP server are
not in the same broadcast domain. During the initial IP address leasing, the
Switch helps to relay network information (such as the IP address and subnet
mask) between a DHCP client and a DHCP server. Once the DHCP client obtains an
IP address and can connect to the network, network information renewal is done
between the DHCP client and the DHCP server without the help of the Switch.
The Switch can be configured as a global DHCP relay. This means that the Switch
forwards all DHCP requests from all domains to the same DHCP server. You can
also configure the Switch to relay DHCP information based on the VLAN
membership of the DHCP clients.
41.4.1 DHCP Relay Agent Information
The Switch can add information about the source of client DHCP requests that it
relays to a DHCP server by adding Relay Agent Information. This helps provide
authentication about the source of the requests. The DHCP server can then
provide an IP address based on this information. Please refer to RFC 3046 for
more details.
The DHCP Relay Agent Information feature adds an Agent Information field to
the Option 82 field. The Option 82 field is in the DHCP headers of client DHCP
request frames that the Switch relays to a DHCP server.
Relay Agent Information can include the System Name of the Switch if you
select this option. You can change the System Name in Basic Settings >
General Setup.
The following describes the DHCP relay information that the Switch sends to the
DHCP server:
Table 132
Relay Agent Information
FIELD LABELS
DESCRIPTION
Slot ID
(1 byte) This value is always 0 for stand-alone switches.
Port ID
(1 byte) This is the port that the DHCP client is connected to.
VLAN ID
(2 bytes) This is the VLAN that the port belongs to.
Information
(up to 64 bytes) This optional, read-only field is set according to
system name set in Basic Settings > General Setup.
Содержание XGS-4528F
Страница 2: ......
Страница 8: ...Safety Warnings XGS 4526 4528F 4728F User s Guide 8...
Страница 24: ...Table of Contents XGS 4526 4528F 4728F User s Guide 24...
Страница 25: ...25 PART I User s Guide...
Страница 26: ...26...
Страница 32: ...Chapter 1 Getting to Know Your Switch XGS 4526 4528F 4728F User s Guide 32...
Страница 36: ...Chapter 2 Hardware Installation and Connection XGS 4526 4528F 4728F User s Guide 36...
Страница 93: ...93 PART II Technical Reference...
Страница 94: ...94...
Страница 100: ...Chapter 7 System Status and Port Statistics XGS 4526 4528F 4728F User s Guide 100...
Страница 116: ...Chapter 8 Basic Setting XGS 4526 4528F 4728F User s Guide 116...
Страница 136: ...Chapter 9 VLAN XGS 4526 4528F 4728F User s Guide 136...
Страница 140: ...Chapter 10 Static MAC Forward Setup XGS 4526 4528F 4728F User s Guide 140...
Страница 172: ...Chapter 14 Bandwidth Control XGS 4526 4528F 4728F User s Guide 172...
Страница 186: ...Chapter 17 Link Aggregation XGS 4526 4528F 4728F User s Guide 186...
Страница 196: ...Chapter 18 Port Authentication XGS 4526 4528F 4728F User s Guide 196...
Страница 214: ...Chapter 21 Policy Rule XGS 4526 4528F 4728F User s Guide 214...
Страница 258: ...Chapter 25 AAA XGS 4526 4528F 4728F User s Guide 258...
Страница 282: ...Chapter 26 IP Source Guard XGS 4526 4528F 4728F User s Guide 282...
Страница 314: ...Chapter 32 Error Disable XGS 4526 4528F 4728F User s Guide 314...
Страница 318: ...Chapter 33 Private VLAN XGS 4526 4528F 4728F User s Guide 318...
Страница 322: ...Chapter 34 Static Route XGS 4526 4528F 4728F User s Guide 322...
Страница 330: ...Chapter 36 RIP XGS 4526 4528F 4728F User s Guide 330...
Страница 386: ...Chapter 43 ARP Learning XGS 4526 4528F 4728F User s Guide 386...
Страница 396: ...Chapter 45 Maintenance XGS 4526 4528F 4728F User s Guide 396...
Страница 442: ...Chapter 49 Cluster Management XGS 4526 4528F 4728F User s Guide 442...
Страница 446: ...Chapter 50 MAC Table XGS 4526 4528F 4728F User s Guide 446...
Страница 450: ...Chapter 51 IP Table XGS 4526 4528F 4728F User s Guide 450...
Страница 454: ...Chapter 53 Routing Table XGS 4526 4528F 4728F User s Guide 454...
Страница 462: ...Chapter 55 Troubleshooting XGS 4526 4528F 4728F User s Guide 462...
Страница 472: ...Chapter 56 Product Specifications XGS 4526 4528F 4728F User s Guide 472...
Страница 480: ...Appendix B Legal Information XGS 4526 4528F 4728F User s Guide 480...