Administering the ARP Cache 7-9
Removing the
Default Route
If a switching module’s routing table does not contain a default route —
either statically configured or learned using RIP — then it cannot forward a
packet that does not match any other routing table entry. If this occurs,
then the module drops the packet and sends an ICMP “destination
unreachable” message to the host that sent the packet to notify it of the
problem.
To remove a default route:
1From the Administration Console top-level menu, enter:
ip route noDefault
2Enter the slot of the switching module for which you want to remove the
default route.
The default route is immediately removed from the routing table.
Administering the ARP Cache
The switching modules use the Address Resolution Protocol (ARP) to find
the MAC addresses corresponding to the IP addresses of hosts and other
routers on the same subnets. Each device participating in routing maintains
an ARP cache — a table of known IP addresses and their corresponding
MAC addresses.
Displaying the ARP
Cache
You can display the contents of the ARP cache for each switching module in
your LANplex system.
To display the contents of the ARP cache:
1From the Administration Console top-level menu, enter:
ip arp display
2Enter the slot(s) of the switching module(s) for which you want to display
the ARP cache. Separate non-consecutive slots with commas (,). Enter a
consecutive series of slots using a dash (-).
Top-Level Menu
system
ethernet
fddi
tokenring
bridge
➧ip
ipx
appletalk
snmp
analyzer
script
logout
interface
➧route
arp
udpHelper
forwarding
rip
ping
statistics
display
static
remove
flush
default
➧noDefault
Top-Level Menu
system
ethernet
fddi
tokenring
bridge
➧ip
ipx
appletalk
snmp
analyzer
script
logout
interface
route
➧arp
udpHelper
forwarding
rip
ping
statistics
➧display
remove
flush