Command Line Interface Reference Guide > The Configuration Menu > /cfg/l3/frwd IP Forwarding Configuration Menu
/cfg/l3/frwd
IP Forwarding Configuration Menu
IP forwarding is enabled by default and is used for VLAN-to-VLAN (non-BGP) routing. Make sure IP forwarding is enabled if the default gateways are on different subnets or if Alteon is connected to different subnets and those subnets need to communicate through Alteon.
 
[IP Forwarding Menu]
local - Local network definition for route caching Menu
allownw - Allowed Networks list
dirbr - Enable/disable forwarding directed broadcasts
noicmprd - Enable/disable No ICMP Redirects
rtcache - Enable/disable SP Route caching
on - Globally turn IP Forwarding ON
off - Globally turn IP Forwarding OFF
cur - Display current IP Forwarding configuration
 
IP Forwarding Configuration Menu Options (/cfg/l3/frwd) 
Command Syntax and Usage
local
 
Displays the Local Network Route Caching Definition menu, used to define local networks for route caching.
allownw
 
Displays allowed network definitions.
dirbr disable|enable
 
Enables or disables forwarding directed broadcasts.
To help eliminate the possibility for a Denial of Service (DoS) attack, the forwarding of directed broadcasts is disabled by default.
Default: disable
noicmprd disable|enable
 
Enables or disables no ICMP redirects.
ICMP redirect messages are used by routers to notify the hosts on the data link that a better route is available for a particular destination. When this option is disabled, Alteon does not issue redirects messages.
Default: disable
rtcache disable|enable
 
Enables or disables route caching by the Alteon switch processor. For more information, see Defining IP Address Ranges for the Local Route Cache.
Values:
*enable — Each Alteon switch processor keeps its own copy of the IP forwarding database, in which routes for learned destination station addresses are cached. In very busy or large flat networks, this cache can fill up quickly and lead to connectivity issues.
*disable — The Alteon switch processor uses the SP Route Prefix table to determine where to forward a packet. This information is based on the known network prefixes in the routing table. This option is useful when the IP forwarding database fills up quickly, which causes connectivity issues.
Default: enable
on
 
Enables IP forwarding (routing). Forwarding is turned on by default.
Required for SLB.
Note: IP forwarding is enabled by default. Make sure IP forwarding is enabled if the default gateways are on different subnets, or if Alteon is connected to different subnets and those subnets need to communicate through Alteon.
off
 
Disables IP forwarding (routing).
cur
 
Displays the current IP forwarding settings.