Using The Cisco Ios Event Tracer To Troubleshoot Problems; Preparing For Online Insertion And Removal Of A Spa - Cisco ASR 1000 Configuration Manual

Chapter 23 Troubleshooting the Cisco WebEx Node for the ASR 1000 Series
The ping command is a convenient way to test the ability of an interface to send and receive packets over
the network. The ping command sends ICMP echo request packets to a specified destination address,
which should send an equal number of ICMP echo reply packets in reply. By measuring the numbering
of packets that are successfully returned, as well as how long each packet takes to be returned, you can
quickly obtain a rough idea of the Layer 3 to Layer 3 connectivity between two interfaces.
The IP ping command has the following syntax:
ping
or
ping ip-address [repeat count] [data hex] [size datagram-size]
If you enter just ping, the command interactively prompts you for all other parameters. Otherwise, you
must specify at least a specific IP address as the destination for the ping. You can also optionally specify
the following parameters:
•
•
•

Using the Cisco IOS Event Tracer to Troubleshoot Problems

This feature is intended for use as a software diagnostic tool and should be configured only under the
Note
direction of a Cisco Technical Assistance Center (TAC) representative.
The Event Tracer feature provides a binary trace facility for troubleshooting Cisco IOS software. This
feature gives Cisco service representatives additional insight into the operation of the Cisco IOS
software and can be useful in helping to diagnose problems in the unlikely event of an operating system
malfunction or, in the case of redundant systems, route processor switchover.
Event tracing works by reading informational messages from specific Cisco IOS software subsystem
components that have been preprogrammed to work with event tracing, and by logging messages from
those components into system memory. Trace messages stored in memory can be displayed on the screen
or saved to a file for later analysis.
The SPAs currently support the "spa" component to trace SPA OIR-related events.

Preparing for Online Insertion and Removal of a SPA

The Cisco ASR 1000 Series Aggregation Services Routers support online insertion and removal (OIR)
of the SIP, in addition to each of the SPAs. Therefore, you can remove a SIP with its SPAs still intact, or
you can remove a SPA independently from the SIP, leaving the SIP installed in the router.
This means that a SIP can remain installed in the router with one SPA remaining active, while you
remove another SPA from one of the SIP subslots. If you are not planning to immediately replace a SPA
into the SIP, then be sure to install a blank filler plate in the subslot. The SIP should always be fully
installed with either functional SPAs or blank filler plates.
For more information about activating and deactivating SPAs in preparation for OIR, see
"Troubleshooting the SIP."
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repeat count—Number of ICMP echo request packets to send. The default is five packets.
data hex—The data pattern, in hexadecimal, to be sent in the ICMP echo request packets.
size datagram-size—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.
Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Software Configuration Guide
Using the Cisco IOS Event Tracer to Troubleshoot Problems
Chapter 5,
23-15