Rev.A0
1-May-11
199
3-18-2. DHCP Snooping Entry
Function name:
DHCP Snooping Entry
Function description:
DHCP snooping Entry allows a switch to add the an trust DHCP server and 2
trust port to build the DHCP snooping available entry. This information can be
useful in tracking an IP address back to a physical port and enable or disable
the DHCP Option 82.
Fig. 3-17-1 DHCP Snooping State
Parameter description:
VID
：
When DHCP snooping is enabled, and enabled on the specified
VLAN, DHCP packet filtering will be performed on any un-trusted
ports within the VLAN. It set a available VLAN ID to enable the DHCP
snooping on VLAN interface.
Trust Port 1
：
If DHCP snooping is enabled globally, and also enabled on
the VLAN where the DHCP packet is received, all DHCP packets are
forwarded for a trusted por. It set a trust port 1. available port from 0
to 8. 0 is disabled.
Trust port 2 :
It set a trust port 2. available port from 0 to 8. 0 is disabled.
Trust VID
：
It set a trust VLAN ID. available VID from 1 to 4094.
Server IP
：
It set a trust DHCP Server IP address for DHCP Snooping.
Option 82
：
It set the DHCP Option 82 function on the switch, default is
Disable.
Action
：
It set the switch when received a client DHCP request packet then
action for filtering. available action : keep/ drop / replace.
Note
：
Filtering rules are implemented as follows:
-
If the DHCP snooping is disabled, all DHCP packets are forwarded.
-
If DHCP snooping is enabled and also enabled on the VLAN where
the DHCP packet is received, all DHCP packets are forwarded for a
trusted port.
-
If DHCP snooping is enabled and also enabled on the VLAN where
the DHCP packet is received, but the port is not trusted, it is
processed as follows:
Summary of Contents for SM8T2DPA
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Page 7: ...Rev A0 1 May 11 v Revision History Date Revision 05 01 2010 A0...
Page 90: ...Rev A0 1 Mar 11 88 Fig 3 36 Fig 3 37 Fig 3 38...
Page 91: ...Rev A0 1 May 11 89 Fig 3 39 Fig 3 40 Fig 3 41 Fig 3 42...
Page 104: ...Rev A0 1 Mar 11 102 Fig 3 61 Set up VLAN Tag Priority Mapping...
Page 105: ...Rev A0 1 May 11 103 Fig 3 62 Set up VLAN Tag Priority Mapping Finish...
Page 113: ...Rev A0 1 May 11 111 Fig 3 69 Frame Type Fig 3 70...
Page 114: ...Rev A0 1 Mar 11 112 Fig 3 71 Fig 3 72 Fig 3 73 ARP...
Page 115: ...Rev A0 1 May 11 113 Fig 3 74 ARP Fig 3 75 ARP Fig 3 76 ARP Fig 3 77 ARP...
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Page 117: ...Rev A0 1 May 11 115 Fig 3 82 ARP Fig 3 83 ARP Fig 3 84 ARP Fig 3 85 ARP Fig 3 86 ARP...
Page 118: ...Rev A0 1 Mar 11 116 Fig 3 87 ARP Fig 3 88 IPv4...
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Page 127: ...Rev A0 1 May 11 125 Fig 3 118 Action Fig 3 119 Rate Limiter...
Page 128: ...Rev A0 1 Mar 11 126 Fig 3 120 Port Copy Fig 3 121 DMAC Filter...
Page 129: ...Rev A0 1 May 11 127 Fig 3 122 VLAN ID Filter Fig 3 123 VLAN ID Filter Fig 3 124 Tag Priority...
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