
Using debug Commands
Because debugging output is assigned high priority in the CPU process, it can render the system unusable.
For this reason, use
debug
commands only to troubleshoot specific problems or during troubleshooting
sessions with Cisco technical support staff. Moreover, it is best to use
debug
commands during periods
of lower network traffic and fewer users. Debugging during these periods decreases the likelihood that
increased
debug
command processing overhead will affect system use.
Caution
The
debug hw-module subslot
command is intended for use by Cisco technical support personnel.
For information about other
debug
commands supported on the Cisco ASR 1000 Series Routers, refer to the
Cisco IOS Debug Command Reference
and any related feature documents for the applicable Cisco IOS release.
Using show Commands
There are several
show
commands that you can use to monitor and troubleshoot the SIPs and SPAs on the
Cisco ASR 1000 Series Routers. This chapter describes using the
show interfaces
command to perform
troubleshooting of your SPA.
For more information about
show
commands to verify and monitor SIPs and SPAs, see
Troubleshooting the
SIP
,
Configuring the Ethernet SPAs
, and the Cisco IOS technology area command reference books.
Performing Basic Interface Troubleshooting
You can perform most of the basic interface troubleshooting using the
show interfaces fastethernet
,
show
interfaces gigabitethernet
, or
show interfaces tengigabitethernet
command and examining several areas
of the output to determine how the interface is operating.
The following example shows an output of
show interfaces gigabitethernet
and
show interfaces
tengigabitethernet
commands with some of the significant areas of the output in bold:
Router#
show interfaces gigabitethernet 2/0/1
GigabitEthernet2/0/1 is down, line protocol is down
Hardware is SPA-1X10GE-L-V2, address is 000a.f330.2e40 (bia 000a.f330.2e40)
Internet address is 2.2.2.1/24
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive not supported
Full-duplex, 1000Mb/s
, link type is force-up, media type is SX
output flow-control is on, input flow-control is on
ARP type: ARPA, ARP Timeout 04:00:00
Last input 03:18:49, output 03:18:44,
output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
1703 packets input, 638959 bytes, 0 no buffer
Received 23 broadcasts (0 IP multicasts)
0 runts, 0 giants, 0 throttles
0 input errors,
0 CRC
Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Software Configuration Guide, Cisco IOS
XE Everest 16.5
176
OL-14127-17
Troubleshooting the Gigabit Ethernet SPAs
Using debug Commands