Dell FCX624-I Laptop User Manual


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PowerConnect B-Series FCX Configuration Guide 813
53-1002266-01
Configuring IP parameters – Layer 3 Switches
26
Proxy ARP is disabled by default on Layer 3 Switches. This feature is not supported on Layer 2
Switches.
You can enable proxy ARP at the Interface level, as well as at the Global CONFIG level, of the CLI.
NOTE
Configuring proxy ARP at the Interface level overrides the global configuration.
Enabling proxy ARP globally
To enable IP proxy ARP on a global basis, enter the following command.
PowerConnect(config)# ip proxy-arp
To again disable IP proxy ARP on a global basis, enter the following command.
PowerConnect(config)# no ip proxy-arp
Syntax: [no] ip proxy-arp
Enabling IP ARP on an interface
NOTE
Configuring proxy ARP at the Interface level overrides the global configuration.
To enable IP proxy ARP on an interface, enter the following command.
PowerConnect(config)# interface ethernet 5
PowerConnect(config-if-e1000-5)# ip proxy-arp enable
To again disable IP proxy ARP on an interface, enter the following command.
PowerConnect(config)# interface ethernet 5
PowerConnect(config-if-e1000-5)# ip proxy-arp disable
Syntax: [no] ip proxy-arp enable | disable
Enabling local proxy ARP
Dell PowerConnect devices support Proxy Address Resolution Protocol (Proxy ARP), a feature that
enables router ports to respond to ARP requests for subnets it can reach. However, router ports will
not respond to ARP requests for IP addresses in the same subnet as the incoming ports, unless
Local Proxy ARP per IP interface is enabled. Local Proxy ARP enables router ports to reply to ARP
requests for IP addresses within the same subnet and to forward all traffic between hosts in the
subnet.
When Local Proxy ARP is enabled on a router port, the port will respond to ARP requests for IP
addresses within the same subnet, if it has ARP entries for the destination IP addresses in the ARP
cache. If it does not have ARP entries for the IP addresses, the port will attempt to resolve them by
broadcasting its own ARP requests.
Local Proxy ARP is disabled by default. To use Local Proxy ARP, Proxy ARP (ip proxy-arp command)
must be enabled globally on the Dell PowerConnect device. You can enter the CLI command to
enable Local Proxy ARP even though Proxy ARP is not enabled, however, the configuration will not
take effect until you enable Proxy ARP.
Use the show run command to view the ports on which Local Proxy ARP is enabled.
To enable Local Proxy ARP, enter commands such as the following.