Quick Reference Guide

590 PowerConnect B-Series TI24X Configuration Guide
53-1002269-02
Configuring IP parameters – Layer 3 Switches
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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
• Layer 3 devices only – BL3 and L3
Enabling local proxy ARP
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. Resolves this issue with the
introduction of Local Proxy ARP per IP interface. 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 (CLI command ip
proxy-arp) must be enabled globally on the 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.
PowerConnect(config)#int e 4
PowerConnect(config-if-e10000-4)#ip local-proxy-arp
Syntax: [no] ip local-proxy-arp
Use the no form of the command to disable Local Proxy ARP.
Creating static ARP entries
Layer 3 Switches have a static ARP table, in addition to the regular ARP cache. The static ARP table
contains entries that you configure.