
C
HAPTER
13
| Security Measures
DHCP Snooping
– 446 –
the DHCP client request, including the port and VLAN ID. This allows
DHCP client-server exchange messages to be forwarded between the
server and client without having to flood them to the entire VLAN.
◆
If DHCP Snooping Information Option 82 is enabled on the switch,
information may be inserted into a DHCP request packet received over
any VLAN (depending on DHCP snooping filtering rules). The
information inserted into the relayed packets includes the circuit-id and
remote-id, as well as the gateway Internet address.
◆
When the switch receives DHCP packets from clients that already
include DHCP Option 82 information, the switch can be configured to
set the action policy for these packets. The switch can either drop the
DHCP packets, keep the existing information, or replace it with the
switch’s relay information.
DHCP S
NOOPING
C
ONFIGURATION
Use the IP Service > DHCP > Snooping (Configure Global) page to enable
DHCP Snooping globally on the switch, or to configure MAC Address
Verification.
CLI R
EFERENCES
◆
"DHCPv4 Snooping" on page 1115
P
ARAMETERS
These parameters are displayed:
◆
DHCP Snooping Status –
Enables DHCP snooping globally.
(Default: Disabled)
◆
DHCP Snooping MAC-Address Verification
– Enables or disables
MAC address verification. If the source MAC address in the Ethernet
header of the packet is not same as the client's hardware address in the
DHCP packet, the packet is dropped. (Default: Enabled)
◆
DHCP Snooping Information Option Status
– Enables or disables
DHCP Option 82 information relay. (Default: Disabled)
◆
DHCP Snooping Information Option Sub-option Format
– Enables
or disables use of sub-type and sub-length fields in circuit-ID (CID) and
remote-ID (RID) in Option 82 information.
◆
DHCP Snooping Information Option Remote ID
– Specifies the
MAC address, IP address, or arbitrary identifier of the requesting device
(i.e., the switch in this context).
■
MAC Address
– Inserts a MAC address in the remote ID sub-option
for the DHCP snooping agent (i.e., the MAC address of the switch’s
CPU). This attribute can be encoded in Hexadecimal or ASCII.
■
IP Address
– Inserts an IP address in the remote ID sub-option for
the DHCP snooping agent (i.e., the IP address of the management
interface). This attribute can be encoded in Hexadecimal or ASCII.
Содержание ECS4660-28F
Страница 1: ...Management Guide www edge core com ECS4660 28F Layer 3 Gigabit Ethernet Switch...
Страница 2: ......
Страница 4: ......
Страница 12: ...ABOUT THIS GUIDE 12...
Страница 64: ...CONTENTS 64...
Страница 90: ...TABLES 90...
Страница 92: ...SECTION I Getting Started 92...
Страница 122: ...SECTION II Web Configuration 122 Multicast Routing on page 825...
Страница 148: ...CHAPTER 3 Using the Web Interface Navigating the Web Browser Interface 148...
Страница 224: ...CHAPTER 5 Interface Configuration VLAN Trunking 224 Figure 68 Configuring VLAN Trunking...
Страница 262: ...CHAPTER 6 VLAN Configuration Configuring VLAN Translation 262...
Страница 304: ...CHAPTER 9 Congestion Control Automatic Traffic Control 304...
Страница 340: ...CHAPTER 11 Quality of Service Attaching a Policy Map to a Port 340...
Страница 452: ...CHAPTER 13 Security Measures DHCP Snooping 452...
Страница 740: ...CHAPTER 17 IP Services Configuring the PPPoE Intermediate Agent 740...
Страница 866: ...CHAPTER 21 Multicast Routing Configuring PIMv6 for IPv6 866...
Страница 882: ...CHAPTER 22 Using the Command Line Interface CLI Command Groups 882...
Страница 1024: ...CHAPTER 26 Remote Monitoring Commands 1024...
Страница 1030: ...CHAPTER 27 Flow Sampling Commands 1030...
Страница 1088: ...CHAPTER 28 Authentication Commands PPPoE Intermediate Agent 1088...
Страница 1162: ...CHAPTER 29 General Security Measures Configuring Port based Traffic Segmentation 1162...
Страница 1186: ...CHAPTER 30 Access Control Lists ACL Information 1186...
Страница 1214: ...CHAPTER 31 Interface Commands Transceiver Threshold Configuration 1214...
Страница 1238: ...CHAPTER 33 Port Mirroring Commands RSPAN Mirroring Commands 1238...
Страница 1258: ...CHAPTER 34 Congestion Control Commands Automatic Traffic Control Commands 1258...
Страница 1270: ...CHAPTER 36 UniDirectional Link Detection Commands 1270...
Страница 1276: ...CHAPTER 37 Address Table Commands 1276...
Страница 1336: ...CHAPTER 39 ERPS Commands 1336...
Страница 1386: ...CHAPTER 40 VLAN Commands Configuring Voice VLANs 1386...
Страница 1406: ...CHAPTER 41 Class of Service Commands Priority Commands Layer 3 and 4 1406...
Страница 1424: ...CHAPTER 42 Quality of Service Commands 1424...
Страница 1536: ...CHAPTER 43 Multicast Filtering Commands MLD Proxy Routing 1536...
Страница 1602: ...CHAPTER 45 CFM Commands Delay Measure Operations 1602...
Страница 1624: ...CHAPTER 47 Domain Name Service Commands 1624...
Страница 1646: ...CHAPTER 48 DHCP Commands DHCP Server 1646...
Страница 1974: ...SECTION IV Appendices 1974...
Страница 1980: ...APPENDIX A Software Specifications Management Information Bases 1980...
Страница 2020: ...ECS4660 28F E102013 ST R03 149100000140A...