08-14-2018 03:08 AM - edited 03-08-2019 03:54 PM
Hi Everyone,
2911 router is directly connected to provider switch.
Provider limits the speed of its port to twenty megabits (for example by bandwidth control function)
Interface on 2911 is monitored by Zabbix (in/out octets).
Zabbix loading schedule for the port shows a load of no more than twenty megabits.
Flow control not used.
how to explain this behavior?
08-14-2018 03:49 AM
Hello,
odd. Can you post the output of 'show interfaces x' of the interface in question ? Who is your ISP ?
08-14-2018 04:13 AM
MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 7/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full Duplex, 100Mbps, media type is RJ45
output flow-control is unsupported, input flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:02, 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: fifo
Output queue: 0/40 (size/max)
30 second input rate 3091000 bits/sec, 415 packets/sec
30 second output rate 782000 bits/sec, 460 packets/sec
3442401307 packets input, 49081606 bytes, 0 no buffer
Received 154 broadcasts (0 IP multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast, 0 pause input
3821223882 packets output, 4040473329 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 pause output
0 output buffer failures, 0 output buffers swapped out
08-14-2018 09:04 AM
08-14-2018 09:36 PM
why the port(on my router) load(by zabbix monitoring) does not go higher 20mb? router port speed does no limits
I assume that this is due to the operation of the tcp protocol. I'm right?
08-14-2018 11:21 PM
Hello
evg.eff@yandex.ru wrote:
why the port(on my router) load(by zabbix monitoring) does not go higher 20mb? router port speed does no limits
I assume that this is due to the operation of the tcp protocol. I'm right?
I could be mistaken here but your router ports are connected to a switch that polices its ports to 20mb correct ?
08-15-2018 12:25 AM
Yes
Router 2911 interface(no limit)-----(100mb link)------(bandwidth limit 20mb) IPS Switch
08-15-2018 12:25 AM
Hello,
how do you have Zabbix configured ? Are you using a template (such as the one linked below) ?
08-15-2018 01:42 AM
zabbix monitored utilization of router interface by:
ififOctets
ifOutOctets
08-15-2018 06:53 AM
08-15-2018 08:05 PM
I think that I was see more than 20 mb utilization of my router port , because its speed is not limited
08-15-2018 11:54 PM
"some UDP applications will rate adapt too."
can be more in detail please?
08-16-2018 05:57 AM - edited 08-16-2018 05:58 AM
Some UDP applications perform some L4 functions provided by TCP. Remember TCP is used so applications, themselves, don't need to directly support logic that's often desired, such as guaranteed delivery, guaranteed sequencing and bandwidth usage.
Reasons vary why applications would not use TCP yet implement TCP like features. For example, in a video stream, video applications often do not want to re-transmit lost packets, but they may shift to a lower quality, and less bandwidth consuming, CODEC if they detect packet loss.
Or consider tftp, it will detect packet loss and retransmit.
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