Routing Assistance When IP Routing is Disabled
These mechanisms allow the Device to learn about routes to other networks when it does not have IP routing
enabled:
•
Proxy ARP
•
Default Gateway
•
ICMP Router Discovery Protocol (IRDP)
Proxy ARP
Proxy ARP is enabled by default. To enable it after it has been disabled, see the “Enabling Proxy ARP” section.
Proxy ARP works as long as other routers support it.
Default Gateway
Another method for locating routes is to define a default router or default gateway. All non-local packets are
sent to this router, which either routes them appropriately or sends an IP Control Message Protocol (ICMP)
redirect message back, defining which local router the host should use. The Device caches the redirect messages
and forwards each packet as efficiently as possible. A limitation of this method is that there is no means of
detecting when the default router has gone down or is unavailable.
Procedure
PurposeCommand or Action
Enables privileged EXEC mode. Enter your
password if prompted.
enable
Example:
Device> enable
Step 1
Enters the global configuration mode.configure terminal
Example:
Device# configure terminal
Step 2
Sets up a default gateway (router).
ip default-gateway ip-address
Example:
Device(config)# ip default gateway
10.1.5.1
Step 3
Routing Configuration Guide, Cisco IOS XE Everest 16.6.x (Catalyst 9500 Switches)
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Configuring IP Unicast Routing
Routing Assistance When IP Routing is Disabled