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[iproute2.git] / examples / diffserv / README

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-
-Note all these are mere examples which can be customized to your needs
-
-AFCBQ
------
-AF PHB built using CBQ, DSMARK,GRED (default in GRIO mode) ,RED for BE 
-and the tcindex classifier with some algorithmic mapping
-
-EFCBQ
------
-EF PHB built using CBQ (for rate control and prioritization), 
-DSMARK( to remark DSCPs), tcindex  classifier and  RED for the BE
-traffic.
-
-EFPRIO
-------
-EF PHB using the PRIO scheduler, Token Bucket to rate control EF,
-tcindex classifier, DSMARK to remark, and RED for the BE traffic
-
-EDGE scripts
-==============
-
-CB-3(1|2)-(u32/chains)
-======================
-
-
-The major differences are that the classifier is u32 on -u32 extension
-and IPchains on the chains extension. CB stands for color Blind
-and 31 is for the mode where only a CIR and CBS are defined whereas
-32 stands for a mode where a CIR/CBS + PIR/EBS are defined.
-
-Color Blind (CB)
-==========-----=
-We look at one special subnet that we are interested in for simplicty
-reasons to demonstrate the capability. We send the packets from that
-subnet to AF4*, BE or end up dropping depending on the metering results. 
-
-
-The algorithm overview is as follows:
-
-*classify:
-
-**case: subnet X
-----------------
-  if !exceed meter1 tag as AF41
-       else
-           if !exceed meter2  tag as AF42
-               else
-                 if !exceed meter 3 tag as AF43
-                     else 
-                        drop 
-
-default case: Any other subnet
--------------------------------
-  if !exceed meter 5 tag as AF43
-      else
-        drop 
-
-
-One Egress side change the DSCPs of the packets to reflect AF4* and BE
-based on the tags from the ingress.
-
--------------------------------------------------------------
-
-Color Aware
-===========
-
-Define some meters with + policing and give them IDs eg
-
-meter1=police index 1 rate $CIR1 burst $CBS1  
-meter2=police index 2 rate $CIR2 burst $CBS2   etc 
-
-General overview:
-classify based on the DSCPs and use the policer ids to decide tagging
-
-
-*classify on ingress:
-
-switch (dscp) {
-    case AF41: /* tos&0xfc == 0x88 */
-       if (!exceed meter1) break;
-    case AF42: /* tos&0xfc == 0x90 */
-       if (!exceed meter2) {
-           tag as AF42;
-           break;
-       }
-    case AF43: /* tos&0xfc == 0x98 */
-       if (!exceed meter3) {
-           tag as AF43;
-           break;
-       } else
-         drop;
-    default:
-       if (!exceed meter4) tag as BE;
-       else drop;
-}
-
-On the Egress side mark the proper AF tags