Nortel Web OS 10.0, Application Manual

Page: 455 / 482

Web OS 10.0 Application Guide
Chapter 17: Bandwidth Management
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455
212777-A, February 2002
5. (Optional) Set the TOS byte value, between 0-255, for the policy underlimit and over-
limit.
There are two parameters for specifying the TOS bits: underlimit (
utos
) and overlimit
(
otos
). These TOS values are used to overwrite the TOS values of IP packets if the traffic for
a contract is under or over the soft limit, respectively. These values only have significance to a
contract if TOS overwrite is enabled in the Bandwidth Management Contract Menu
(
cfg/bwm/cont x/wtos ena
.)
The administrator has to be very careful in selecting the TOS values because of their greater
impact on the downstream routers.
6. Set the buffer limit for the policy.
Set a value between 8192-128000 bytes. The buffer depth for a BWM contract should be set to
a multiple of the packet size.
N
OTE
– Keep in mind that the total buffer limit for the Bandwidth Management policy is
128K.
7. On the switch, select a BWM contract and (optional) a name for the contract.
Each contract must have a unique number from 1 to 256.
8. (Optional) Set a precedence value for the BWM contract.
Each contract can be given a precedence value from 1-256. The higher the number, the higher
the precedence. If a frame is applicable to different classifications, then the contract with
higher precedence will be assigned to the frame. If the precedence is the same for the applica-
ble contracts, then the following order will be used to assign the contract to the frame:
(1) Incoming port, (2) VLAN, (3) Filter, (4) Service on the Virtual server, (5) URL/Cookie
>> Policy 1# utos 204
(Set BWM policy underlimit)
>> Policy 1# otos 192
(Set BWM policy overlimit)
>> Policy 1# buffer
16320 (Set BWM policy buffer limit)
>> Policy 1# /cfg/bwm/cont 1
(Select BWM contract 1)
>> BWM Contract 1# name BigCorp
(Assign contract name “BigCorp”)
>> BWM Contract 1# prec 1
(Sets contract precedence value to 1)