Brocade FastIron Ethernet Switch Security Configuration Gu Bedienungsanleitung Seite 339
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Configuring DHCP snooping
Configuring DHCP snooping consists of the following steps.
1. Enable DHCP snooping on a VLAN.Refer to Enabling DHCP snooping on a VLAN on page 339.
2. For ports that are connected to a DHCP server, change their trust setting to trusted.Refer to Enabling
DHCP snooping on a VLAN on page 339.
The following shows the default settings of DHCP snooping.
Feature Default
DHCP snooping Disabled
Trust setting for ports Untrusted
Enabling DHCP snooping on a VLAN
When DHCP snooping is enabled on a VLAN, DHCP packets are inspected.
DHCP snooping is disabled by default. This feature must be enabled on the client and the DHCP server
VLANs. To enable DHCP snooping, enter the following global command for these VLANs.
device(config)#ip dhcp snooping vlan 2
The command enables DHCP snooping on VLAN 2.
Syntax: [no] ip dhcp snooping vlan vlan-id
The vlan-id variable specifies the ID of a configured client or DHCP server VLAN.
Enabling trust on a port connected to a DHCP server
The default trust setting for a port is untrusted. To enable trust on a port connected to a DHCP server,
enter commands such as the following.
device(config)#interface ethernet 1/1
device(config-if-e10000-1/1)#dhcp snooping trust
Port 1/1 is connected to a DHCP server. The commands change the CLI to the interface configuration
level of port 1/1 and set the trust setting of port 1/1 to trusted.
Syntax: [no] ip dhcp snooping trust
Disabling the learning of DHCP clients on a port
You can disable DHCP client learning on an individual port. To do so, enter commands such as the
following.
device(config)#interface ethernet 1/1
device(config-if-e10000-1/1)#dhcp snooping client-learning disable
Syntax: [no] dhcp snooping client-learning disable
Use the no form of the command to re-enable DHCP client learning on a port once it has been disabled.
Configuring DHCP snooping
FastIron Ethernet Switch Security Configuration Guide 339
53-1003088-03
- FastIron Ethernet Switch 1
- Contents 3
- 53-1003088-03 10
- Document conventions 13
- Notes, cautions, and warnings 14
- Brocade resources 15
- Getting technical help 15
- Document feedback 16
- About This Document 17
- Security Access 19
- Securing access methods 20
- Remote access restrictions 25
- Restricting Telnet connection 26
- Defining the Telnet idle time 27
- Device management security 30
- Disabling Telnet access 31
- Disabling SNMP access 31
- Disabling TFTP access 31
- Setting a Telnet password 32
- Local user accounts 35
- Enabling user password aging 38
- Configuring password history 38
- Enhanced login lockout 39
- Setting passwords to expire 39
- TACACS and TACACS+ security 42
- TACACS authentication 44
- TACACS+ authorization 45
- TACACS+ accounting 45
- Configuring TACACS 47
- Configuring TACACS+ 47
- Enabling TACACS 48
- Setting the TACACS+ key 49
- Setting the timeout parameter 50
- RADIUS security 58
- RADIUS accounting 59
- AAA operations for RADIUS 59
- Configuring RADIUS 61
- RADIUS server per port 64
- RADIUS parameters 66
- Setting RADIUS over IPv6 67
- RADIUS authorization 69
- SSL security 73
- Authentication-method lists 75
- SSH2 and SCP 81
- Tested SSH2 clients 82
- SSH2 supported features 82
- SSH2 authentication types 83
- Optional SSH parameters 88
- Setting the SSH port number 89
- Displaying SSH information 90
- Secure copy with SSH2 93
- SSH2 client 96
- Enabling SSH2 client 97
- Using SSH2 client 98
- Rule-Based IP ACLs 101
- ACL overview 103
- Types of IP ACLs 104
- ACL IDs and entries 104
- Numbered and named ACLs 105
- Default ACL action 105
- How hardware-based ACLs work 106
- Standard numbered ACL syntax 108
- Standard named ACL syntax 109
- Extended numbered ACL syntax 112
- Extended named ACL syntax 118
- ACL comment text management 123
- Viewing comments in an ACL 124
- ACL logging 126
- Displaying ACL Log Entries 128
- ACLs to filter ARP packets 132
- Clearing the filter count 134
- QoS options for IP ACLs 135
- ACL-based rate limiting 140
- ACL statistics 140
- ACL accounting 141
- Displaying ACL information 143
- Troubleshooting ACLs 144
- Policy-based routing (PBR) 144
- Configuring a PBR policy 145
- Configuring the ACLs 145
- Configuring the route map 147
- Enabling PBR 148
- Setting the next hop 149
- IPv6 ACLs 153
- IPv6 ACL configuration notes 155
- Configuring an IPv6 ACL 156
- Creating an IPv6 ACL 158
- For ICMP 159
- ICMP message configurations 163
- Support for ACL logging 166
- Displaying IPv6 ACLs 168
- 802.1X Port Security 169
- IETF RFC support 170
- Setting the IP MTU size 175
- EAP pass-through support 176
- 802.1X accounting 180
- Setting RADIUS parameters 181
- Supported RADIUS attributes 182
- Re-authenticate a user 183
- Specifying an untagged VLAN 185
- Specifying a tagged VLAN 185
- Disabled strict security mode 188
- Enabling 802.1X port security 191
- Setting the port control 191
- Setting the quiet period 193
- Initializing 802.1X on a port 195
- Displaying 802.1X information 200
- Syntax: show dot1x 201
- Displaying 802.1X statistics 205
- Clearing 802.1X statistics 206
- Sample 802.1X configurations 210
- Point-to-point configuration 211
- Hub configuration 212
- MAC Port Security 217
- Secure MAC movement 219
- On an untagged interface 221
- On a tagged interface 221
- Clearing violation statistics 223
- MAC-based VLANs 227
- Static and dynamic hosts 228
- Dynamic MAC-based VLAN 229
- MAC-based VLAN configuration 231
- RADIUS server 232
- Aging for MAC-based VLAN 233
- For blocked hosts 234
- Globally disabling aging 234
- Displaying the MAC-VLAN table 237
- Clearing MAC-VLAN information 243
- Defining MAC Address Filters 247
- RADIUS authentication 255
- Unauthenticated port behavior 255
- Support for dynamic ACLs 256
- Defining MAC address filters 261
- MAC address or port 275
- MAC addresses 277
- Web Authentication 291
- Using local user databases 296
- Creating static passcodes 300
- Automatic authentication 304
- Specifying trusted ports 305
- Filtering DNS queries 308
- Web authentication pages 310
- Customizing the title bar 315
- Customizing the header 316
- Customizing the text box 316
- Customizing the login button 317
- Customizing the footer 317
- Displaying passcodes 321
- DoS Attack Protection 323
- TCP SYN attacks 326
- TCP security enhancement 327
- Dynamic ARP inspection 331
- About Dynamic ARP Inspection 332
- ARP entries 333
- Displaying the ARP table 335
- DHCP snooping 336
- How DHCP snooping works 337
- Configuring DHCP snooping 339
- Multi-VRF support 341
- DHCP relay agent information 342
- DHCP Option 82 sub-options 344
- DHCP option 82 configuration 345
- IP source guard 349
- DHCPv6 snooping 355
- How DHCPv6 snooping works 356
- Configuring DHCPv6 snooping 357
- IPv6 RA Guard 361
- RA guard policy 362
- Whitelist 362
- Prefix list 362
- Maximum preference 362
- Configuring IPv6 RA guard 363
- Configuring port A: 365
- Configuring port C: 365
- Configuring port B: 365
- Security Commands 367
- 802.1x port security 385
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