How to implement bandwidth distribution in 1841 router

[darksilver26]

hello cisco enthusiast.

I would like to ask help from you how would this configuration goes.

I got a 5MBps Lease Line Connection via FAST ETHERNET PORT. i got a Cisco 1841 Router.

I want to distribute bandwidth in this ratio 2MBps/2MBps/1MBps

2MBps = Office Connection

2MBps = Computer Laboratory Connection

1MBps = WIFI Connection

1841 has only 2 Fast Ethernet ports

so im planning to add up a 2modules of 2-Port Fast Ethernet High-Speed WIC for Cisco Integrated Services Routers

thank you

[Joseph W. Doherty]

Disclaimer

The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.

Liability Disclaimer

In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.

Posting

Policing is fine, inbound, if you want to limit bandwidth downstream of the policer.  For instance, if you only want the "Office Connection" to be able to obtain 2 Mbps, but if the issue is you don't want the "Office Connection" to use more than 2 Mbps of the 5 Mbps lease line, a policer can't guarantee that as it only rate-limits the traffic after it has already crossed the lease line.  (NB: if the protocol being use is flow rate drop sensitive, e.g. TCP, such flows should avoid going too far over the policed rate, but they will burst over it.  Protocols not flow rate drop sensitive, will continue to transmit at whatever rate they desire.)

[darksilver26]

Policing is fine, inbound, if you want to limit bandwidth downstream of the policer.  For instance, if you only want the "Office Connection" to be able to obtain 2 Mbps, but if the issue is you don't want the "Office Connection" to use more than 2 Mbps of the 5 Mbps lease line, a policer can't guarantee that as it only rate-limits the traffic after it has already crossed the lease line.  (NB: if the protocol being use is flow rate drop sensitive, e.g. TCP, such flows should avoid going too far over the policed rate, but they will burst over it.  Protocols not flow rate drop sensitive, will continue to transmit at whatever rate they desire.)

thank you joseph, what do you think should I do to really impose strictly the

download/upload bandwidth distribution of  2MBps : 2MBps : 1MBps

[Joseph W. Doherty]

Disclaimer

The  Author of this posting offers the information contained within this  posting without consideration and with the reader's understanding that  there's no implied or expressed suitability or fitness for any purpose.  Information provided is for informational purposes only and should not  be construed as rendering professional advice of any kind. Usage of this  posting's information is solely at reader's own risk.

Liability Disclaimer

In  no event shall Author be liable for any damages whatsoever (including,  without limitation, damages for loss of use, data or profit) arising out  of the use or inability to use the posting's information even if Author  has been advised of the possibility of such damage.

Posting

Normally, for outbound, I would recommend what I posted earlier which provides your ratios of 2:2:1 but allows each class to use otherwise unused bandwidth.  If you really do want to enforce a cap even when there's available bandwidth, then some thing like this (below) might be used:

policy-map egressSampleWithShaping

class office

bandwidth percent 20

shape average 2000000

class lab

bandwidth percent 20

shape average 2000000

class wifi

bandwidth percent 10

shape average 1000000

For inbound, if you want to restrict obtaining bandwidth, a policer (if supported) works, but as I've noted in my earlier post, it doesn't accurately control inbound bandwidth consumption.  Additionally, policer's default settings often police bursty traffic too soon, resulting in higher drop rates and you cannot share unused bandwidth.

The best deal would be if you could get your provider to implement an egress bandwidth sharing policy; most providers, though, are reluctant to do so.

[darksilver26]

Thank you both for your suggestion but i was browsing the the link matt posted and i found out that traffic policing doesnt support 1841 router

Cisco IOS Release 12.2(2)T or later does not run on Cisco 2500 series routers. 
 •Cisco 2600 series 
 •Cisco 3640 routers 
 •Cisco 4500 series 
 •Cisco 7000 series with RSP7000 
 •Cisco 7100 series 
 •Cisco 7200 series 
 •Cisco 7500 series 

the said cisco 1841 router will be lease from the ISP which if it doesnt fit the requirment I will be suggesting alternative cisco router to fit the requirement.