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Catalyst 3550 Multilayer Switch Software Configuration Guide
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Chapter22 Configuring IP Unicast Routing Configuring IP Addressing
This is an example of output from the show interfaces interface-id privileged EXEC command
displaying ARP encapsulation.
Switch# show interfaces gigabitethernet0/10
GigabitEthernet0/10 is up, line protocol is up
Hardware is Gigabit Ethernet, address is 0002.4b29.2e00 (bia 0002
Internet address is 40.5.121.10/24
MTU 1500 bytes, BW 100000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s
input flow-control is off, output flow-control is off
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output 00:00:04, output hang never
Last clearing of "show interface" counters never
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 input packets with dribble condition detected
30745 packets output, 3432096 bytes, 0 underruns
0 output errors, 0 collisions, 6 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
Enable Proxy ARP
By default, the switch uses proxy ARP to help hosts determine MAC addresses of ho sts on oth er
networks or subnets.
Beginning in privileged EXEC mode, follow these steps to enable proxy ARP if it has been disabled:
To disable proxy ARP on the interface, use the no ip proxy-arp interface configuration command.
Command Purpose
Step1 configure terminal Enter global configuration mode.
Step2 interface interface-id Enter interface configuration mode, and specify the Layer 3
interface to configure.
Step3 ip proxy-arp Enable proxy ARP on the interface.
Step4 end Return to privileged EXEC mode.
Step5 show ip interface [interface-id] Verify the configuration on the interface or all interfaces.
Step6 copy running-config startup-config (Optional) Save your entries in the configuration file.