Cisco ASR 1000 Configuration Guide

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Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Software Configuration Guide
OL-14127-08
Chapter 8 Troubleshooting the ATM SPAs
Displaying Additional ATM SPA Data
DETAILED STEPS
Command or Action Purpose
Step 1
Router# configure terminal Enters global configuration mode.
Step 2
Router(config)# interface atm slot/subslot/port Enters interface configuration mode for the indicated port
on the specified ATM SPA card.
Step 3
Router(config-if)# loopback diagnostic Puts the ATM interface into the local loopback mode, so
that data that is transmitted out the interface is internally
routed back into the receive data line.
Step 4
Router(config-if)# atm clock internal Specifies that the AMT interface should derive its clocking
from its local oscillator, which is required, because the
loopback command isolates the interface from the network
and from the clocking signals that are derived from the
network line.
Step 5
Router(config-if)# end Exits interface configuration mode and returns to privileged
EXEC mode.
Step 6
Router# show interface atm slot/subslot/port (Optional) Verifies that the interface has been configured
for loopback mode. The output should show the words
“loopback set” when the interface is operating in loopback
mode.
Step 7
Router(config-if)# ping ip-address [repeat count]
[data hex] [size datagram-size]
Sends an ICMP echo request packet to the specified IP
address.
• ip-address—Destination IP address for the ICMP echo
request packet. Because the interface has been put into
loopback mode, the exact IP address does not
matter—any valid IP address can be specified.
• repeat count—(Optional) Specifies the number of
ICMP echo request packets to be sent. The default is 5.
• data hex—(Optional) The data pattern, in hexadecimal,
to be sent in the ICMP echo request packets.
• size datagram-size—(Optional) Specifies the size, in
bytes, of the ICMP echo request packets to be sent. The
range is 40 to 18024 bytes, with a default of 100 bytes.
Note Because the interface is in loopback mode, the ping
command will report that it failed. This is to be
expected.
Step 8
Router# show interface atm slot/subslot/port Displays interface statistics, including whether any CRC or
other errors occurred during the ping test. For example:
Router# show interface atm 5/0/1
...
Received 0 broadcasts, 0 runts, 0 giants, 0
throttles
5 input errors, 5 CRC, 0 frame, 0 overrun, 0
ignored, 0 abort
...
Router#
Step 9
Router(config)# interface atm slot/subslot/port Enters interface configuration mode for the indicated port
on the specified ATM SPA card.

Cisco ASR 1000 Specifications

General

Brand	Cisco
Model	ASR 1000
Category	Network Router
Language	English