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Available Bandwidth (serial line)

horvaia
Level 1
Level 1

Hi All,

I have an E1 network module (NM-2CE1U=) in my router (c3640).

I configured a leased line from timeslot 1 to 30.

The question is why the router says this:

Available Bandwidth 1440 kilobits/sec

the controller config:

controller E1 3/1

channel-group 1 timeslots 1-30

the interface config:

interface Serial3/1:1

description 1920 kbps

bandwidth 1920

ip address 192.168.11.29 255.255.255.252

no ip route-cache cef

no cdp enable

sh int ser3/1:1

Serial3/1:1 is up, line protocol is up

Hardware is DSX1

Description: 1920 kbps

Internet address is 192.168.11.29/30

MTU 1500 bytes, BW 1920 Kbit, DLY 20000 usec,

reliability 255/255, txload 67/255, rxload 9/255

Encapsulation HDLC, loopback not set

Keepalive set (10 sec)

Last input 00:00:05, output 00:00:00, output hang never

Last clearing of "show interface" counters 20w0d

Input queue: 0/75/4029/0 (size/max/drops/flushes); Total output drops: 10429

Queueing strategy: weighted fair

Output queue: 0/1000/64/4799 (size/max total/threshold/drops)

Conversations 0/23/256 (active/max active/max total)

Reserved Conversations 0/0 (allocated/max allocated)

Available Bandwidth 1440 kilobits/sec

5 minute input rate 69000 bits/sec, 39 packets/sec

5 minute output rate 505000 bits/sec, 74 packets/sec

14033195 packets input, 472113071 bytes, 0 no buffer

Received 51780 broadcasts, 279 runts, 0 giants, 0 throttles

4032 input errors, 2538 CRC, 1497 frame, 0 overrun, 0 ignored, 263 abort

20795275 packets output, 497192000 bytes, 0 underruns

0 output errors, 0 collisions, 426 interface resets

0 output buffer failures, 0 output buffers swapped out

313 carrier transitions

Timeslot(s) Used:1-30, Transmitter delay is 0 flags

1 Accepted Solution

Accepted Solutions

Kevin Dorrell
Level 10
Level 10

The "available bandwidth" is only the router's guess, allowing a very approximate 25% overhead for routing protocols etc. In truth, if you are not running any routing protocols, you could probably get much closer to the 1920 kbps of data traffic out of it.

Kevin Dorrell

Luxembourg

View solution in original post

2 Replies 2

Kevin Dorrell
Level 10
Level 10

The "available bandwidth" is only the router's guess, allowing a very approximate 25% overhead for routing protocols etc. In truth, if you are not running any routing protocols, you could probably get much closer to the 1920 kbps of data traffic out of it.

Kevin Dorrell

Luxembourg

Thanks Kevin,

this explains this issue.

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