Re: read and not write TOS [7:36946]
Thank you. It's clear for me now. with IP Prec or DiffServ (which one is it?) IP precedence (3 bits), for layer 3 Priority for layer 2. Teresa - Original Message - From: Steven A. Ridder To: [EMAIL PROTECTED] Sent: Monday, March 04, 2002 9:19 PM Subject: Re: read and not write TOS [7:36946] I'm pretty good with QOS. If you connect your special switch to a router and you mark your packets with IP Prec or DiffServ (which one is it?) your packet will remain marked until they reach the destination. The only time you would lose these markings is if a router is programmed to strip the markings and replace them with something else. As for your CoS bits, they will be fine until they hit a layer 3 device. If they remain on a large flat L2 network, then they will remain untouched. If the packets have to go through a router of some sort (because they need to be routed to a different network) the L3 device will strip the layer 2 ethernet packet, replace them with it's own l2 packet based on what type of link it's going out of (PPP, HDLC, another ethernet netowrk) and send it on it's merry way. Unfortuately, that L2 packet had your 802.1p bits in it and it was trashed. So you lost them (unless you have the router map l2 to l3). Therefore, it's better to just mark L3. Finally, just because you mark your packets, doesn't mean you'll get any special treatment unles the routers are told to do so (unless you have WFQ enabled on the router, as WFQ automatically classifies based on IP Prec or DiffServ.). Look up MQC to create policies to do things with your marked packets. -- RFC 1149 Compliant. TP wrote in message news:[EMAIL PROTECTED]; 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? - 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 Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=37241t=36946 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: read and not write TOS [7:36946]
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? - 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 Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=37136t=36946 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: read and not write TOS [7:36946]
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=7i=37180t=36946 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: read and not write TOS [7:36946]
I'm pretty good with QOS. If you connect your special switch to a router and you mark your packets with IP Prec or DiffServ (which one is it?) your packet will remain marked until they reach the destination. The only time you would lose these markings is if a router is programmed to strip the markings and replace them with something else. As for your CoS bits, they will be fine until they hit a layer 3 device. If they remain on a large flat L2 network, then they will remain untouched. If the packets have to go through a router of some sort (because they need to be routed to a different network) the L3 device will strip the layer 2 ethernet packet, replace them with it's own l2 packet based on what type of link it's going out of (PPP, HDLC, another ethernet netowrk) and send it on it's merry way. Unfortuately, that L2 packet had your 802.1p bits in it and it was trashed. So you lost them (unless you have the router map l2 to l3). Therefore, it's better to just mark L3. Finally, just because you mark your packets, doesn't mean you'll get any special treatment unles the routers are told to do so (unless you have WFQ enabled on the router, as WFQ automatically classifies based on IP Prec or DiffServ.). Look up MQC to create policies to do things with your marked packets. -- RFC 1149 Compliant. TP wrote in message news:[EMAIL PROTECTED]; 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? - 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 Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=37185t=36946 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
read and not write TOS [7:36946]
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 Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=36946t=36946 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: read and not write TOS [7:36946]
Look up MQC on Cisco.com. It is possible and by default if the router has WFQ on, it already reacts to different ToS (IP Prec) values. -- RFC 1149 Compliant. TP wrote in message news:[EMAIL PROTECTED]; 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 Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=36949t=36946 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: read and not write TOS [7:36946]
QOS configs can be complicated, especially when using CBWFQ, CAR, WRED, or LLQ. A neat way to learn how to use these powerfull features is installing QDM on the router. I HATE using GUI's to configure routers but this little web applet is a good way to learn how to do a complex QOS config. It's a security hole, But you can always turn off HTTP server on the router when you are not using it. It will show you how to do exactly what you are looking for. Check it out: http://www.cisco.com/warp/public/477/QDM_faq.shtml http://www.cisco.com/univercd/cc/td/doc/product/rtrmgmt/qdm/ Tony M. #6172 - Original Message - From: Steven A. Ridder To: Sent: Friday, March 01, 2002 3:56 AM Subject: Re: read and not write TOS [7:36946] Look up MQC on Cisco.com. It is possible and by default if the router has WFQ on, it already reacts to different ToS (IP Prec) values. -- RFC 1149 Compliant. TP wrote in message news:[EMAIL PROTECTED]; 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 Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=36967t=36946 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: read and not write TOS [7:36946]
Is MQC the newest TLA for LLQ/CBWFQ? ;-) Tony Medeiros 3/1/02 8:00:22 AM QOS configs can be complicated, especially when using CBWFQ, CAR, WRED, or LLQ. A neat way to learn how to use these powerfull features is installing QDM on the router. I HATE using GUI's to configure routers but this little web applet is a good way to learn how to do a complex QOS config. It's a security hole, But you can always turn off HTTP server on the router when you are not using it. It will show you how to do exactly what you are looking for. Check it out: http://www.cisco.com/warp/public/477/QDM_faq.shtml http://www.cisco.com/univercd/cc/td/doc/product/rtrmgmt/qdm/ Tony M. #6172 - Original Message - From: Steven A. Ridder To: Sent: Friday, March 01, 2002 3:56 AM Subject: Re: read and not write TOS [7:36946] Look up MQC on Cisco.com. It is possible and by default if the router has WFQ on, it already reacts to different ToS (IP Prec) values. -- RFC 1149 Compliant. TP wrote in message news:[EMAIL PROTECTED]; 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 Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=36973t=36946 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
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 Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=36988t=36946 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: read and not write TOS [7:36946]
On the Cat 6k you can do IP Prec or DiffServ. Otherwise you have to map 802.1p to Prec or DiffServ. By summer a lot more models will be able to do this such as the 2900 and 4900, 4000, etc. Nortel already does this on their Business Policy Manager switch and it's pretty reasonably priced at $3000. FYI, IP TOS is the entire 1 byte field within an IP packet and contains the IP Prec Bits (3 most significant bits in that field) or DiffServ Bits (6 most significant bits). You set those, not ToS. I'm just nitpicking, but Pricilla would be proud. :) -- RFC 1149 Compliant wrote in message news:[EMAIL PROTECTED]; 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 Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=36991t=36946 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
