Router not using all available bandwidth?
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08-09-2011 06:59 PM - edited 03-04-2019 01:14 PM
I am having trouble with a T1 connection between a cisco 7200VXR and cisco 2600. I have no problem connecting across it, but when I run a download across the link I get a flat 6KB/s. I can't seem to find what is wrong in my configuration that would be causing this.
7200 Router:
#show running
Building configuration...
Current configuration : 2262 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname RTR1
!
boot-start-marker
boot system flash disk0:c7200-a3jk9s-mz.124-25.bin
boot-end-marker
!
enable secret 5 ...
!
aaa new-model
!
!
!
aaa session-id common
!
!
ip cef
ip domain name RTR1
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
username root password 0 abcd
!
!
controller T1 1/0
framing esf
linecode b8zs
channel-group 0 timeslots 1-24
description T1 connection
!
controller T1 1/1
framing esf
linecode b8zs
!
controller T1 1/2
framing esf
linecode b8zs
!
controller T1 1/3
framing esf
linecode b8zs
!
controller T1 1/4
framing esf
linecode b8zs
!
controller T1 1/5
framing esf
linecode b8zs
!
controller T1 1/6
framing esf
linecode b8zs
!
controller T1 1/7
framing esf
linecode b8zs
!
ip ssh time-out 60
ip ssh authentication-retries 2
ip ssh version 1
!
!
!
!
!
interface FastEthernet0/0
description uplink
ip address 1.2.3.5 255.255.255.0 secondary
ip address 1.2.3.4 255.255.255.0
ip nat outside
ip virtual-reassembly
duplex auto
speed auto
!
interface FastEthernet0/1
description uplink 2
ip address 1.2.4.5 255.255.255.0
duplex auto
speed auto
!
interface Serial1/0:0
description T1
ip address 10.2.1.1 255.255.255.248
ip nat inside
ip virtual-reassembly
!
!
ip default-gateway 209.124.33.1
ip forward-protocol nd
ip route 0.0.0.0 0.0.0.0 1.2.3.1
ip route 10.2.7.0 255.255.255.0 10.2.1.2
!
no ip http server
no ip http secure-server
!
ip nat inside source static 10.2.7.2 1.2.3.5
!
access-list 99 permit 10.2.1.0 0.0.0.255
!
!
!
control-plane
!
!
!
!
!
!
gatekeeper
shutdown
!
!
line con 0
transport output all
stopbits 1
line aux 0
transport output all
stopbits 1
line vty 0 4
transport input ssh
transport output all
line vty 5 15
access-class 99 in
transport input ssh
!
!
end
Controller:
#show controller T1
T1 1/0 is up.
Applique type is Channelized T1
Cablelength is long gain36 0db
Description: T1
No alarms detected.
alarm-trigger is not set
Soaking time: 3, Clearance time: 10
AIS State:Clear LOS State:Clear LOF State:Clear
Framing is ESF, Line Code is B8ZS, Clock Source is Internal.
Data in current interval (270 seconds elapsed):
0 Line Code Violations, 0 Path Code Violations
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
Total Data (last 24 hours)
0 Line Code Violations, 3 Path Code Violations,
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,
1 Errored Secs, 1 Bursty Err Secs, 0 Severely Err Secs, 130 Unavail Secs
Interface:
#
Serial1/1:0 is up, line protocol is up
Hardware is Multichannel T1
Description: to the Flint Farmers Market
Internet address is 10.2.1.1/29
MTU 1500 bytes, BW 1536 Kbit/sec, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation HDLC, crc 16, Data non-inverted
Keepalive set (10 sec)
Last input 00:00:02, output 00:00:00, output hang never
Last clearing of "show interface" counters 02:27:54
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/3/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
Available Bandwidth 1152 kilobits/sec
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
6307 packets input, 512222 bytes, 0 no buffer
Received 965 broadcasts, 1 runts, 0 giants, 0 throttles
1 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
5594 packets output, 4701504 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 unknown protocol drops
0 output buffer failures, 0 output buffers swapped out
1 carrier transitions
no alarm present
Timeslot(s) Used:1-24, subrate: 64Kb/s, transmit delay is 0 flags
2600 Router:
#show running
Building configuration...
Current configuration : 839 bytes
!
version 12.3
service timestamps debug uptime
service timestamps log uptime
service password-encryption
!
hostname RTR2
!
boot-start-marker
boot-end-marker
!
logging buffered 4096 debugging
enable secret 5 ...
enable password 7 ...
!
no aaa new-model
ip subnet-zero
ip cef
!
!
!
!
!
!
!
!
interface Ethernet0/0
description Link to Local Network
ip address 10.2.7.1 255.255.255.252
full-duplex
no cdp enable
!
interface Serial0/0
description Link to RTR1 Serial1/0:0
ip address 10.2.1.2 255.255.255.248
fair-queue
!
no ip http server
ip classless
ip route 0.0.0.0 0.0.0.0 10.2.1.1
!
!
!
line con 0
exec-timeout 0 0
line aux 0
line vty 0 4
password 7 ...
login
!
!
end
Interface:
#show interfaces serial 0/0
Serial0/0 is up, line protocol is up
Hardware is PQUICC with Fractional T1 CSU/DSU
Description: Link to RTR1 Serial1/0:0
Internet address is 10.2.1.2/29
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation HDLC, loopback not set
Keepalive set (10 sec)
Last input 00:00:01, output 00:00:00, 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: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/5/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
Available Bandwidth 1158 kilobits/sec
5 minute input rate 1000 bits/sec, 1 packets/sec
5 minute output rate 1000 bits/sec, 1 packets/sec
8680 packets input, 1005109 bytes, 0 no buffer
Received 2958 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
11361 packets output, 1766828 bytes, 0 underruns
0 output errors, 0 collisions, 2 interface resets
0 output buffer failures, 0 output buffers swapped out
1 carrier transitions
DCD=up DSR=up DTR=up RTS=up CTS=up
edit- added updates interface output
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08-09-2011 07:38 PM
53747 input errors, 1895 CRC, 0 frame, 0 overrun, 0 ignored, 26043 abort
Maybe this is the reason?
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08-09-2011 10:59 PM
Sometimes It takes another set of eyes to look at it, I made the mistake of reading 0 CRC on the 2600 side and didn't even pay attention to the 7200 CRC stats.
Thank you, I will have a tech look at the line and see if that is the problem.
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08-10-2011 02:23 PM
Even after the technicians repaired the line and I am no longer seeing CRC errors on either side I am still getting poor performance (~6KB/s), any other thoughts?
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08-10-2011 04:35 PM
If the link flat-lines at 6kbps then I'm suspecting the service provider is throttling it somewhere in their network.
Make sure you have no suspicious log entries on both routers. Can you post the "sh proc cpu history" of both routers?
Is it slow one way or BOTH ways?
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08-10-2011 06:33 PM
Hi Eric,
Either you can ask your SP to do an onsite throughput test or make an Iperf test yourself.
Sent from Cisco Technical Support iPhone App
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08-11-2011 06:21 AM
Please try download after disabling fair-quque.
interface Serial0/0
description Link to RTR1 Serial1/0:0
ip address 10.2.1.2 255.255.255.248
fair-queue
thanks
ajay
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08-11-2011 09:21 AM
2600#sh proc cpu history
RTR2 09:12:54 PM Tuesday Mar 2 1993 UTC
11111
100
90
80
70
60
50
40
30
20
10
0....5....1....1....2....2....3....3....4....4....5....5....
0 5 0 5 0 5 0 5 0 5
CPU% per second (last 60 seconds)
22111111 2 1115653 1 11 1
100
90
80
70
60
50
40
30
20
10 ***
0....5....1....1....2....2....3....3....4....4....5....5....
0 5 0 5 0 5 0 5 0 5
CPU% per minute (last 60 minutes)
* = maximum CPU% # = average CPU%
11 1 8
611111111111111641411111111111111111115161116
100
90 *
80 *
70 *
60 *
50 *
40 *
30 *
20 * * *
10 * * ** * *
0....5....1....1....2....2....3....3....4....4....5....5....6....6....7.
0 5 0 5 0 5 0 5 0 5 0 5 0
CPU% per hour (last 72 hours)
* = maximum CPU% # = average CPU%
7200:
#sh proc cpu history
ETS-DET-RTR1 08:08:06 AM Thursday Aug 11 2011 UTC
999999999999999999999999999999999999999999999999999999999999
777999999999999999999999999888887777777777766666555566666655
100 ************************************************************
90 ************************************************************
80 ************************************************************
70 ************************************************************
60 ************************************************************
50 ************************************************************
40 ************************************************************
30 ************************************************************
20 ************************************************************
10 ************************************************************
0....5....1....1....2....2....3....3....4....4....5....5....6
0 5 0 5 0 5 0 5 0 5 0
CPU% per second (last 60 seconds)
9999999999999999999
8999899788899999998 1 1
100 #####*############*
90 #####*############*
80 #####*############*
70 ###################
60 ###################
50 ###################
40 ###################
30 ###################
20 ###################
10 ###################
0....5....1....1....2....2....3....3....4....4....5....5....6
0 5 0 5 0 5 0 5 0 5 0
CPU% per minute (last 60 minutes)
* = maximum CPU% # = average CPU%
1111111 1111 1999 912 11 111111 917912 2 111 1 11 2 1111 11
110211580491889999970696128768141433695190476468048897395570899940966407
100 *** * * *
90 *** * * *
80 *** * * *
70 *** * * **
60 *** * * **
50 *** * * **
40 *** * * **
30 *** * * **
20 * * **** #** **** * * * ** * **
10 **************##**#*********************#*******************************
0....5....1....1....2....2....3....3....4....4....5....5....6....6....7..
0 5 0 5 0 5 0 5 0 5 0 5 0
CPU% per hour (last 72 hours)
* = maximum CPU% # = average CPU%
Now, that looks interesting, I have no idea why that is happening.
#sh proc cpu sorted
CPU utilization for five seconds: 99%/86%; one minute: 90%; five minutes: 69%
PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
191 111604 1456919 76 13.39% 7.93% 4.38% 0 IP NAT Ager
78 31932 20011 1595 0.16% 0.25% 0.96% 2 SSH Process
39 45656 41723 1094 0.08% 0.02% 0.00% 0 Logger
25 289496 3644350 79 0.08% 0.02% 0.00% 0 ARP Input
67 3299712 416575 7921 0.08% 1.98% 1.30% 0 IP Input
26 348 220233 1 0.08% 0.00% 0.00% 0 HC Counter Timer
6 6476 720 8994 0.00% 0.00% 0.00% 0 Pool Manager
8 20 9876 2 0.00% 0.00% 0.00% 0 Serial Backgroun
Looks like NAT is using a lot of CPU usage, but still does not add up to 100%. Any Ideas?
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08-11-2011 09:40 AM
So I added some shorter timeouts to nat, but I am still seeing extremely high CPU usage.
#sh proc cpu sorted
CPU utilization for five seconds: 97%/96%; one minute: 98%; five minutes: 97%
PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
5 503596 76507 6582 0.49% 0.07% 0.06% 0 Check heaps
39 63552 44058 1442 0.08% 0.02% 0.00% 0 Logger
29 51456 76980 668 0.08% 0.03% 0.01% 0 EEM ED Syslog
105 6092 1034109 5 0.08% 0.00% 0.00% 0 CEF process
41 23288 748560 31 0.08% 0.03% 0.02% 0 Per-Second Jobs
2 30880 149949 205 0.00% 0.01% 0.00% 0 Load Meter
6 6476 727 8907 0.00% 0.00% 0.00% 0 Pool Manager
4 0 1 0 0.00% 0.00% 0.00% 0 EDDRI_MAIN
9 0 2 0 0.00% 0.00% 0.00% 0 ATM Idle Timer
3 0 1 0 0.00% 0.00% 0.00% 0 chkpt message ha
1 28 248 112 0.00% 0.00% 0.00% 0 Chunk Manager
12 0 2 0 0.00% 0.00% 0.00% 0 AAA high-capacit
7 0 2 0 0.00% 0.00% 0.00% 0 Timers
8 40 9918 4 0.00% 0.00% 0.00% 0 Serial Backgroun
10 0 2 0 0.00% 0.00% 0.00% 0 ATM AutoVC Perio
16 0 1 0 0.00% 0.00% 0.00% 0 RO Notify Timers
17 8396 746977 11 0.00% 0.00% 0.00% 0 EnvMon
18 0 1 0 0.00% 0.00% 0.00% 0 OIR Handler
19 4 12515 0 0.00% 0.00% 0.00% 0 IPC Dynamic Cach
11 0 2 0 0.00% 0.00% 0.00% 0 ATM VC Auto Crea
13 0 1 0 0.00% 0.00% 0.00% 0 AAA_SERVER_DEADT
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08-11-2011 09:52 AM
Troubleshooting Interrupts might help.
http://www.cisco.com/en/US/products/hw/routers/ps359/products_tech_note09186a00801c2af0.shtml
