At 03:11 AM 3/4/02, TP wrote: >I said "special switch": it is a switch with ethernet ports and voice ports, >with the voice processor and its stack. >So, I can program the "special switch" in order to set the TOS (layer 3) per >port basis and the COS (layer 2) per port basis. >What happens to my packet (or frames) when I connect this switch to a router >(827 per adsl) or to a layer 3 catalyst for different design?
What do you want to happen to the packets? Cisco supports so many Quality of Service (QoS) features, it's hard to answer your question! For example, although IP Precedence is not a queuing method, queuing methods such as weighted fair queuing (WFQ) and Weighted Random Early Detection (WRED) can use the IP Precedence setting of the packet in the TOS field to prioritize traffic. Committed Access Rate (CAR) can also use the IP Precedence. Cisco also supports the newer meanings for TOS (that is the Differentiated Services bits). Anyway, you probably haven't gotten a good answer from us because Cisco makes all of this so complicated, it's hard to give a simple answer. ;-) You should start by skimming the Cisco IOS Quality of Service Solutions Configuration Guide here: http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fqos_c/index.htm I don't know much about the 827 router. Hopefully it can do everything a bigger router could do. If not, check its specific documentation for QoS configuration information. Good luck. Let us know how it goes. Thanks. Priscilla >----- Original Message ----- > From: [EMAIL PROTECTED] > To: [EMAIL PROTECTED] > Sent: Friday, March 01, 2002 6:05 PM > Subject: Re: read and not write TOS [7:36946] > > > I don't think you can set the ToS bits on a switch. You can only set the > CoS bit and the CoS will not be translated to a ToS on router unless you > force it to in the configuration. ToS is a layer 3 function and CoS is a > layer 2 function > > > >From: "TP" > >Reply-To: "TP" > >To: [EMAIL PROTECTED] > >Subject: read and not write TOS [7:36946] > >Date: Fri, 1 Mar 2002 06:14:30 -0500 > > > >Dear group, > >i have the following situation: > >a "special" switch connected to a cisco router via ethernet interface. > >This switch is enable to set TOS based on its ports. > >I'd like to configure the router in order to have different queuing based > >on > >the TOS (two or three queues). > >The router should read (and NOT write) the TOS and priorituze the >traffic > >with the higher TOS: is it possible? If yes, maybe with access-list or > >samething different, can you provide the proper command lines? > >Thanks in advance > >Teresa > _________________________________________________________________ > MSN Photos is the easiest way to share and print your photos: > http://photos.msn.com/support/worldwide.aspx ________________________ Priscilla Oppenheimer http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=37180&t=36946 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
