11-20-2009 07:24 AM - edited 03-04-2019 06:45 AM
Hi,
I have two routers connected each other using lease line. The bandwidth between them is 1 Mbps. but i am seeing nearly 2 mbps leaving from Router-1 to Rouer-2. how it is possible? is i am looking in the wrong way? the output is from the serial interface on both routers.
Router-1
interface Serial0
bandwidth 1024
ip address 10.10.10.1 255.255.255.252
end
Serial0 is up, line protocol is up
Hardware is QUICC Serial
Description: * South-Router *
Internet address is 10.10.10.1/30
MTU 1500 bytes, BW 1024 Kbit, DLY 20000 usec,
reliability 255/255, txload 253/255, rxload 31/255
Encapsulation HDLC, loopback not set
Keepalive set (10 sec)
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters 41w1d
Input queue: 23/75/0/0 (size/max/drops/flushes); Total output drops: 193755
Queueing strategy: weighted fair
Output queue: 0/1000/64/193755 (size/max total/threshold/drops)
Conversations 0/31/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
Available Bandwidth 768 kilobits/sec
5 minute input rate 126000 bits/sec, 134 packets/sec
5 minute output rate 1986000 bits/sec, 210 packets/sec
790114604 packets input, 3258179720 bytes, 2474 no buffer
Received 2905199 broadcasts, 0 runts, 30 giants, 3159 throttles
33171 input errors, 23120 CRC, 7997 frame, 0 overrun, 0 ignored, 2054 abort
1009731639 packets output, 491591296 bytes, 0 underruns
0 output errors, 0 collisions, 240 interface resets
0 output buffer failures, 0 output buffers swapped out
4 carrier transitions
DCD=up DSR=up DTR=up RTS=up CTS=up
***************************************************************************************************************************
Router-2
interface Serial0
bandwidth 1024
ip address 10.10.10.2 255.255.255.252
end
sh int serial 0
Serial0 is up, line protocol is up
Hardware is QUICC Serial
Description: * North-Router*
Internet address is 10.10.10.2/30
MTU 1500 bytes, BW 1024 Kbit, DLY 20000 usec,
reliability 255/255, txload 30/255, rxload 252/255
Encapsulation HDLC, loopback not set
Keepalive set (10 sec)
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters 41w1d
Input queue: 1/75/0/0 (size/max/drops/flushes); Total output drops: 22670
Queueing strategy: weighted fair
Output queue: 0/1000/64/22405 (size/max total/threshold/drops)
Conversations 0/18/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
Available Bandwidth 768 kilobits/sec
5 minute input rate 1990000 bits/sec, 210 packets/sec
5 minute output rate 121000 bits/sec, 129 packets/sec
1009750041 packets input, 518574419 bytes, 1 no buffer
Received 2906175 broadcasts, 0 runts, 185 giants, 1 throttles
9306 input errors, 4205 CRC, 3988 frame, 0 overrun, 0 ignored, 1103 abort
790300876 packets output, 3277362537 bytes, 0 underruns
0 output errors, 0 collisions, 260 interface resets
0 output buffer failures, 0 output buffers swapped out
1672 carrier transitions
DCD=up DSR=up DTR=up RTS=up CTS=up
**************************************************************
11-20-2009 07:45 AM
The bandwidth statement does not reflect the actual bandwidth of the link ie. if the bandwidth is more adding a bandwidth statement would not limit it to that.
The bandwidth statement is actually used for QOS and by certain routing protocols such as EIGRP. That is why you should actually make the bandwidth statement reflect the actual "true" bandwidth of the line.
Jon
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