Chapter 8
| General Security Measures
ARP Inspection
– 255 –
Example
Console#show ip source-guard binding
MacAddress IpAddress Lease(sec) Type VLAN Interface
----------------- --------------- ---------- -------------------- ---- --------
11-22-33-44-55-66 192.168.0.99 0 Static 1 Eth 1/5
Console#
ARP Inspection
ARP Inspection validates the MAC-to-IP address bindings in Address Resolution
Protocol (ARP) packets. It protects against ARP traffic with invalid address bindings,
which forms the basis for certain “man-in-the-middle” attacks. This is accomplished
by intercepting all ARP requests and responses and verifying each of these packets
before the local ARP cache is updated or the packet is forwarded to the appropriate
destination, dropping any invalid ARP packets.
ARP Inspection determines the validity of an ARP packet based on valid IP-to-MAC
address bindings stored in a trusted database – the DHCP snooping binding
database. ARP Inspection can also validate ARP packets against user-configured
ARP access control lists (ACLs) for hosts with statically configured IP addresses.
This section describes commands used to configure ARP Inspection.
Table 52: ARP Inspection Commands
Command
Function
Mode
ip arp inspection
Enables ARP Inspection globally on the switch
GC
ip arp inspection filter
Specifies an ARP ACL to apply to one or more VLANs
GC
ip arp inspection log-buffer
logs
Sets the maximum number of entries saved in a log
message, and the rate at these messages are sent
GC
ip arp inspection validate
Specifies additional validation of address components in
an ARP packet
GC
ip arp inspection vlan
Enables ARP Inspection for a specified VLAN or range of
VLANs
GC
ip arp inspection limit
Sets a rate limit for the ARP packets received on a port
IC
ip arp inspection trust
Sets a port as trusted, and thus exempted from ARP
Inspection
IC
show ip arp inspection
configuration
Displays the global configuration settings for ARP
Inspection
PE
show ip arp inspection
interface
Shows the trust status and inspection rate limit for ports PE
show ip arp inspection log
Shows information about entries stored in the log,
including the associated VLAN, port, and address
components
PE
Содержание EX-3524
Страница 2: ......
Страница 28: ...Figures 28 ...
Страница 34: ...Section I Getting Started 34 ...
Страница 58: ...Chapter 1 Initial Switch Configuration Setting the System Clock 58 ...
Страница 72: ...Chapter 2 Using the Command Line Interface CLI Command Groups 72 ...
Страница 156: ...Chapter 5 SNMP Commands Notification Log Commands 156 ...
Страница 164: ...Chapter 6 Remote Monitoring Commands 164 ...
Страница 218: ...Chapter 7 Authentication Commands Management IP Filter 218 ...
Страница 268: ...Chapter 8 General Security Measures Port based Traffic Segmentation 268 ...
Страница 292: ...Chapter 9 Access Control Lists ACL Information 292 ...
Страница 312: ...Chapter 10 Interface Commands Power Savings 312 ...
Страница 324: ...Chapter 11 Link Aggregation Commands Trunk Status Display Commands 324 ...
Страница 366: ...Chapter 15 Address Table Commands 366 ...
Страница 428: ...Chapter 17 VLAN Commands Configuring Voice VLANs 428 ...
Страница 572: ...Chapter 25 IP Interface Commands IPv6 Interface 572 ...
Страница 578: ...Section I Appendices 578 ...
Страница 594: ...Appendix C Customer Support Manuals 594 ...