APC IP DSLAM Betriebsanweisung Seite 140

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Application Note
132
7.2.12 TOS Priority Rearrangement
Most of traditional broadband service, there is only one PVC was
offered to the users. In such kind of service scenario, using the TOS
field in the IP header to differentiate the applications is one of the
solutions for ISPs to provide QoS service to its users.
The CPE (or router) shall have the capability to differentiate the service
priority, and indicated in the TOS field, so that the DSLAM can classify
the packets into different priority queues based upon the TOS field.
Following is an example to modify the priority of the packet based on IP
TOS field. In this example, the packets with IP TOS precedence
value as 3 would be tagged as ethernet priority value 2.
Step 1:
$ create filter rule entry ruleid 2 action retagprio priority 2 statsstatus
enable description QOS
Entry Created
Rule Id : 2 Rule Action : retagprio
Set Priority : 2 Admin status : disable
Stats admin status : disable Rule Priority: high
Rule Direction : in ApplyWhenReq : disable
Pkt Type : Ucast
Application Description : QoS
Snoop Level : interface Expression Id: 0
Step 2:
$ create filter subrule generic ruleid 2 subruleid 1 offsethdr ip offset 0
mask 0x00ff0000 valuefrom 0x600000 gencmp eq
Entry Created
Rule Id : 2 Subrule Id : 1
Offset header : ip Offset : 0
Generic header comparison : eq Mask : 0x00ff0000
Subrule Priority : asinrule Start value : 0x00600000
End value : -
Transport Header : ethernet
NamedList Id : -
Step 3:
$ modify filter rule entry ruleid 2 status enable
Rule Id : 2 Rule Action : retagprio
Set Priority : 2 Admin status : disable
Stats admin status : disable Rule Priority: high
Rule Direction : in ApplyWhenReq : disable
Pkt Type : Ucast
Application Description : QoS
Snoop Level : interface Expression Id: 0
Set Done
Rule Id : 2 Rule Action : retagprio
Set Priority : 2 Admin status : enable
Stats admin status : disable Rule Priority: high
Rule Direction : in ApplyWhenReq : disable
Pkt Type : Ucast
Application Description : QoS
Snoop Level : interface Expression Id: 0
Step 4:
$ create filter rule map ruleid 2 ifname eoa-0 stageid 1
Entry Created
Interface : eoa-2 Stage Id : 1
Rule Id : 2 Order Id : 2
Step 5:
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