Chapter 40 DHCP
XGS4700-48F User’s Guide
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40.4 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.
40.4.1 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 131
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.
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Страница 8: ...Safety Warnings XGS4700 48F User s Guide 8...
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Страница 25: ...25 PART I User s Guide...
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Страница 32: ...Chapter 1 Getting to Know Your Switch XGS4700 48F User s Guide 32...
Страница 54: ...Chapter 3 Hardware Overview XGS4700 48F User s Guide 54...
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Страница 104: ...Chapter 7 System Status and Port Statistics XGS4700 48F User s Guide 104...
Страница 118: ...Chapter 8 Basic Setting XGS4700 48F User s Guide 118...
Страница 138: ...Chapter 9 VLAN XGS4700 48F User s Guide 138...
Страница 142: ...Chapter 10 Static MAC Forward Setup XGS4700 48F User s Guide 142...
Страница 174: ...Chapter 14 Bandwidth Control XGS4700 48F User s Guide 174...
Страница 188: ...Chapter 17 Link Aggregation XGS4700 48F User s Guide 188...
Страница 198: ...Chapter 18 Port Authentication XGS4700 48F User s Guide 198...
Страница 216: ...Chapter 21 Policy Rule XGS4700 48F User s Guide 216...
Страница 260: ...Chapter 25 AAA XGS4700 48F User s Guide 260...
Страница 284: ...Chapter 26 IP Source Guard XGS4700 48F User s Guide 284...
Страница 316: ...Chapter 32 Error Disable XGS4700 48F User s Guide 316...
Страница 320: ...Chapter 33 Static Route XGS4700 48F User s Guide 320...
Страница 328: ...Chapter 35 RIP XGS4700 48F User s Guide 328...
Страница 384: ...Chapter 42 ARP Learning XGS4700 48F User s Guide 384...
Страница 420: ...Chapter 45 Access Control XGS4700 48F User s Guide 420...
Страница 426: ...Chapter 47 Syslog XGS4700 48F User s Guide 426...
Страница 434: ...Chapter 48 Cluster Management XGS4700 48F User s Guide 434...
Страница 438: ...Chapter 49 MAC Table XGS4700 48F User s Guide 438...
Страница 442: ...Chapter 50 IP Table XGS4700 48F User s Guide 442...
Страница 446: ...Chapter 52 Routing Table XGS4700 48F User s Guide 446...
Страница 454: ...Chapter 54 Troubleshooting XGS4700 48F User s Guide 454...
Страница 464: ...Chapter 55 Product Specifications XGS4700 48F User s Guide 464...
Страница 473: ...Appendix B Legal Information XGS4700 48F User s Guide 473...
Страница 474: ...Appendix B Legal Information XGS4700 48F User s Guide 474...