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3com 2500 User Guide

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Administering the ARP Cache 10-11
Removing the
Default Route
You can remove a module’s default route.
Be careful when you remove a module’s default route. If a system’s 
routing table does not contain a default route — either statically 
configured or learned using RIP or OSPF — then the module cannot 
forward a packet that matches no routing table entries. When this 
occurs, the module drops the unroutable packet and sends an ICMP 
destination unreachable
 message to the host that sent the packet.
To remove a default route, from the top level of the Administration 
Console, enter:
ip route noDefault
The default route is immediately removed from the table.
Administering the 
ARP Cache
The CoreBuilder 2500 system uses the Address Resolution Protocol (ARP) 
to find the MAC addresses that correspond to the IP addresses of hosts 
and routers on the same subnetworks. An ARP cache is a table of known 
IP addresses and their corresponding MAC addresses. 
Displaying the
ARP Cache
To display the contents of the ARP cache, from the top level of the 
Administration Console, enter:
ip arp display
Sample ARP cache display:
Top-Level Menu
system
ethernet
fddi
atm
bridge
➧
ip
ipx
appletalk
snmp
analyzer
script
logout
interface
➧
route
arp
atmArpServer
multicast
udpHelper
routing
icmpRouterDiscovery
ospf
rip
ping
statistics
display
static
remove
flush
default
➧
noDefault
Top-Level Menu
system
ethernet
fddi
atm
bridge
➧
ip
ipx
appletalk
snmp
analyzer
script
logout
interface
route
➧
arp
atmArpServer
multicast
udpHelper
routing
icmpRouterDiscovery
ospf
rip
ping
statistics
➧
display
remove
flush
IP routing is disabled, ICMP router discovery is disabled
IP address      I/F                            Hardware address Circuit
158.101.43.33   1                              08-00-09-6d-b6-70 -/-
158.101.43.254  1                              08-00-02-0a-16-09 -/-