Qos and Avaliable bandwith

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Jan 29th, 2009
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hi,

i have 4Mb bandwidth terminated on my Gigabitethernet interface. when i issue sh int Gigabitethernet 0/0 i found that there is " Available Bandwidth 3072 kilobits/sec" what does it means?

The second part of the question is if i the bandwidth is terminated on Gigabitethernet interface and 4 mb of the bandwidth is allocated to me from my service provider, i have applied Qos and have default class in it, will my router sends default class traffic with 1G and service provider router drops all extra traffic.


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Joseph W. Doherty Thu, 01/29/2009 - 05:51
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"will my router sends default class traffic with 1G and service provider router drops all extra traffic"


Provider might drop excess or queue. Question best anwered by provider. Or, you shape to 4 Mbps and issue doesn't arise.


For your other questions, it would help if you would identify the device, IOS and provide config and stats information. Otherwise, it's possible a general reply would be incorrect in your instance.

itdsmartnet Fri, 01/30/2009 - 00:22
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hi,

my device is 3845 router with IOS "Cisco IOS Software, 3800 Software (C3845-ADVIPSERVICESK9-M), Version 12.4(21), RELEASE SOFTWARE (fc1)"

sh output of sh interface is as follows:

GigabitEthernet0/0 is up, line protocol is up

Hardware is BCM1125 Internal MAC, address is 001e.f7ec.6da0 (bia 001e.f7ec.6da0)

Description: *** Connected to Internet ***$ETH-WAN$$FW_OUTSIDE$

Internet address is A.B.C.C/28

MTU 1500 bytes, BW 4096 Kbit, DLY 100 usec,

reliability 255/255, txload 210/255, rxload 252/255

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Full-duplex, 100Mb/s, media type is RJ45

output flow-control is XON, input flow-control is XON

ARP type: ARPA, ARP Timeout 04:00:00

Last input 00:00:00, 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: 68902

Queueing strategy: weighted fair

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

Conversations 0/16/256 (active/max active/max total)

Reserved Conversations 0/0 (allocated/max allocated)

Available Bandwidth 3072 kilobits/sec

1 minute input rate 4048000 bits/sec, 714 packets/sec

1 minute output rate 3384000 bits/sec, 765 packets/sec

78305600 packets input, 101519131 bytes, 0 no buffer

Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

0 watchdog, 79230 multicast, 0 pause input

0 input packets with dribble condition detected

73416433 packets output, 2208166831 bytes, 0 underruns

1 output errors, 0 collisions, 2 interface resets

0 unknown protocol drops

0 babbles, 0 late collision, 0 deferred

1 lost carrier, 0 no carrier, 0 pause output

0 output buffer failures, 0 output buffers swapped out

Joseph W. Doherty Fri, 01/30/2009 - 04:18
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And the config?


And policy-map stats, if using?


Without seeing the above, assuming you're using a CBWFQ service policy, and assuming you're set bandwidth on the interface to 4 Mbps, the 3 Mbps available bandwidth is likely the defualt available allocation for CBWFQ since it set asides 25% of link bandwidth (although that bandwidth should be usable).

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