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Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
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Chapter 42 Troubleshooting
Using Ping

IP Routing and Routed Port

You can use this configuration to enable IP routing, change a switchport to a routed port, and permit
pings from the switch to a connected host:
switch# configure terminal
switch(config)# int fa0/1
switch(config-if)# no switchport
switch(config-if)# ip address 192.168.1.1 255.255.255.0
switch(config-if)# no shutdown
switch(config-if)# exit
switch(config)# ip routing
switch(config)# end
switch# ping 192.168.1.2
Ping Responses
This response is typical of a successful ping to a host:
Switch# ping 72.20.52.3
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echoes to 172.20.52.3, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms
Switch#
An unsuccessful ping results in this message:
Switch# ping 72.20.52.3
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echoes to 172.20.52.3, timeout is 2 seconds:
. . . . .
Success rate is 0 percent (0/5)
Summary
Keep these guidelines in mind while pinging:
IP routing is available only with the metro IP access image and is disabled by default.
To ping a host in a different IP subnetwork from the switch, you must have IP routing configured to
route between the subnets, and a static route to the destination might also be appropriate. If you need
to enable or configure IP routing, see Chapter 35, “Configuring IP Unicast Routing.”
All software versions can use a Layer 3 service policy to permit pings to and from a host connected
to a UNI or ENI. For more information about policy maps, see the “Input and Output Policies”
section on page 33-4.
If your switch is running the metro IP access image, use one of these methods to ping a host connected
to a UNI or ENI:
Use a Layer 3 service policy to permit pings to and from a host connected to a UNI or ENI.
Enable global IP routing and configure a port as a routed port by using the no switchport interface
configuration command.
Enable global IP routing, create an SVI, and assign an IP address to it. For more information about
SVIs, see the “Switch Virtual Interfaces” section on page 9-5.