CCIE - Traffic Shaping

Author

Traffic Shaping

mkhan

2003-02-04, 12:38 am

We want to control the Bandwidth espcially for the ADSL which are currently on STM1 with PPPOE & Bridge technology.

We have several multpoint & point to point interfaces on cisco routers for these ADSLs now the situation is we want to control our bandwidth by limiting this on per interface bases for example.

"interface atm 6/0.20 multipoint"

pvc 2/123
ubr 100
encap aal5snap
protocol pppoe

pvc 2/124
ubr 125
encap aal5snal
protocol pppoe

and so on......

if above interface having 20 pvc's for 20 DSLs having avg. speed of 100k, per pvc that means total bandwidth utalizition for this interface is 2.0mb apx.

now what is the possibility if we limit the whole interface by 1mb and so.

Please response as soon as possible, with example.

Regards,

lcooper

2003-02-05, 4:30 pm

We have a similar configuration you are describing, however we are using nrt-vbr atm protocol with aal5snap. Let me explain my setting and than you can decide if this configuration can work for environment. In this variable we are using a hub-spoke router where the branch office is the spoke and the data center is the hub. A typical branch office has 3mb (2x 1.55mbs -T1) we than use atm sub-interface to further breakdown the available bandwidth to which the office requires resources. The configuration is given below.

Interface Atm1/0
No ip address
Atm-srambling cell-payload
Atm framing cbitplcp

Inteface atm1/0.1 point-point
Pvc 1/32
Protocol ip X.X.X.X
Vbr-nrt 3000 2500 250 (3000 represent PCR peak cell-rate, 2500 MBS or maximum burst size, 250 MBS minimum burst size is usually given by your ISP and stated in the SLA contact.

I hope this answer your questions concerning traffic-shaping on an ATM link. I am well trained in traffic-shaping atm/ frame-relay so if there any other questions you would like ask let me know.

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