Yassou, Before doing anything, I would configure IP SAA on both R1 and R2 in order to simulate voice traffic and measure jitter, packet loss and delay between your routers.
This way you could see if what you are doing makes it worst or better for your voice services. Christophe -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Tassos Chatzithomaoglou Sent: Tuesday, August 21, 2007 12:15 PM To: cisco-nsp Subject: [c-nsp] QoS between 2 routers & many switches Suppose we have the following network: 100 100 10 100 100 R1 <===> SW1 <===> SW2 <===> SW3 <===> SW4 <===> R2 All switches are just L2 devices and all connections are just plain ethernet. As you can see there is a 10 Mbps link between SW2 and SW3, while all other links are 100 Mbps. I need to give priority (& maybe reserve bw) to voice traffic between R1 and R2. Does it make sense to try to use QoS (LLQ/CBWFQ) on the routers only? If yes (that would be the best for me), how can the routers "understand" the actual congestion between SW2/SW3, when all intermediate switches use their own (default ?) buffering/queuing mechanisms? Will there be any difference on the "congestion feedback" that routers get, if instead of 4 switches, i have 8 switches? On the other hand: Should i try to implement QoS on the SW2/SW3 switches only? Or even better, do i need to implement QoS at both routers & switches? If the SW2/SW3 connection is EoMPLS, does it make any difference? Do i need some kind of QoS on the underlying MPLS network too? -- Tassos _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/ __________ NOD32 2472 (20070821) Information __________ This message was checked by NOD32 antivirus system. http://www.eset.com _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
