Foundry Networks FESX User Manual

Foundry Configuration Guide for the FESX, FSX, and FWSX
16 - 28 © Foundry Networks, Inc. December 2005
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 Foundry 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:
FESX424 Switch(config)# int e 4
FESX424 Switch(config-if-e1000-4)# 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
Foundry Layer 3 Switches have a static ARP table, in addition to the regular ARP cache. The static ARP table
contains entries that you configure.
Static entries are useful in cases where you want to pre-configure an entry for a device that is not connected to the
Layer 3 Switch, or you want to prevent a particular entry from aging out. The software removes a dynamic entry
from the ARP cache if the ARP aging interval expires before the entry is refreshed. Static entries do not age out,
regardless of whether the Foundry device receives an ARP request from the device that has the entry’s address.
NOTE: You cannot create static ARP entries on a Layer 2 Switch.
The maximum number of static ARP entries you can configure depends on the product. See “Changing the
Maximum Number of Entries the Static ARP Table Can Hold” on page 16-28.
To display the ARP cache and static ARP table, see the following:
• To display the ARP table, see “Displaying the ARP Cache” on page 16-64.
• To display the static ARP table, see “Displaying the Static ARP Table” on page 16-65.
To create a static ARP entry, enter a command such as the following:
FESX424 Router(config)# arp 1 192.53.4.2 1245.7654.2348 e 1/2
Syntax: arp <num> <ip-addr> <mac-addr> ethernet [<slotnum>/]<portnum>
The <num> parameter specifies the entry number. You can specify a number from 1 up to the maximum number
of static entries allowed on the device.
The <ip-addr> command specifies the IP address of the device that has the MAC address of the entry.
The <mac-addr> parameter specifies the MAC address of the entry.
The <slotnum> parameter is required on chassis devices.
The <portnum> command specifies the port number attached to the device that has the MAC address of the entry.
Changing the Maximum Number of Entries the Static ARP Table Can Hold
Table 16.6 on page 16-29 lists the default maximum and configurable maximum number of entries in the static
ARP table that are supported on each type of Foundry Layer 3 Switch. If you need to change the maximum
number of entries supported on a Layer 3 Switch, use either of the following methods.
NOTE: You must save the configuration to the startup-config file and reload the software after changing the static
ARP table size to place the change into effect.

Foundry Networks FESX Specifications

General

Brand	Foundry Networks
Model	FESX
Category	Switch
Language	English