Hi Joe, As you speak about window scaling, i understand your tests are revolved around TCP; then, neither of CAR and policying will help; you need to shape outbound.
A simple test is: policy-map SHAPE-14M class class-default shape average 1400000 ! interface FastEthernet0/0 ... service-policy output SHAPE-14M ! Cheers, Paolo On Fri, Feb 15, 2008 at 11:28:38PM -0600, Joe Freeman wrote: > I tried both straight rate-limiting and traffic policing with no change in > symptoms. > > On 2/15/08, Paolo Lucente <[EMAIL PROTECTED]> wrote: > > > > Hi Joe, > > > > it might be you need to apply some outbound shaping onto the interface > > facing > > the Internet due to the difference between the access rate (100Mbps) and > > the > > CIR (15Mbps). This could explain why degraded throughput is experienced > > only > > upstream. I can't really imagine it could be a CPU-related issue, but all > > in > > all it's worth checking it. > > > > Cheers, > > > > Paolo > > > > > > > > On Fri, Feb 15, 2008 at 02:59:55PM -0600, Joe Freeman wrote: > > > Folks- > > > > > > I have a situation in which a customer has a 2811 router connected to an > > > Ethernet over SONET pipe from me onto which he subscribes 15M of > > Internet. > > > The SONET portion of the pipe currently has 11 VT1.5's cross-connected. > > This > > > customer is seeing asymmetric performance on the link in that his upload > > > speeds are significantly lower than the download speeds. > > > > > > Given that there is no congestion on the network, plenty of bandwidth is > > > available, and no significant packet/frame loss errors are seen at any > > > point, including on the SONET ADM boxes, I'm sort of at a loss. Further, > > I > > > can plug my laptop into this port with 1323 opts, nagle, window scaling, > > and > > > a large MAX window size and test absolutely fine across the circuit. I > > plug > > > the same laptop into the lan side of his router (Fa0/1, below) and I see > > the > > > significant drop of which he's complaining. > > > > > > I've also verified the speed/duplex settings are appropriate and are > > working > > > correctly. One other thing I've noticed is that as I increase bandwidth > > > across the SONET ring, the disconnect between upload and download speeds > > > appears to grow on an almost log scale. > > > > > > Anyone have any thoughts or tips on this? > > > > > > Thanks- > > > Joe > > > > > > R1#sho ver > > > Cisco IOS Software, 2800 Software (C2800NM-IPBASE-M), Version 12.4(3d), > > > RELEASE SOFTWARE (fc3) > > > Technical Support: http://www.cisco.com/techsupport > > > Copyright (c) 1986-2006 by Cisco Systems, Inc. > > > Compiled Wed 19-Apr-06 09:18 by alnguyen > > > > > > ROM: System Bootstrap, Version 12.4(1r) [hqluong 1r], RELEASE SOFTWARE > > (fc1) > > > > > > nettech uptime is 1 hour, 23 minutes > > > System returned to ROM by power-on > > > System image file is "flash:c2800nm-ipbase-mz.124-3d.bin" > > > > > > Cisco 2811 (revision 53.51) with 251904K/10240K bytes of memory. > > > Processor board ID FTX1027A1HS > > > 6 FastEthernet interfaces > > > DRAM configuration is 64 bits wide with parity enabled. > > > 239K bytes of non-volatile configuration memory. > > > 62720K bytes of ATA CompactFlash (Read/Write) > > > > > > Configuration register is 0x2102 > > > > > > R1#sho run > > > Building configuration... > > > > > > Current configuration : 1115 bytes > > > ! > > > version 12.4 > > > service timestamps debug datetime msec > > > service timestamps log datetime msec > > > no service password-encryption > > > ! > > > hostname R1 > > > ! > > > boot-start-marker > > > boot-end-marker > > > ! > > > ! > > > no aaa new-model > > > ! > > > resource policy > > > ! > > > ip subnet-zero > > > ! > > > ! > > > ip cef > > > ! > > > ! > > > no ip domain lookup > > > ip domain name R1.net > > > ! > > > ! > > > ! > > > ! > > > interface FastEthernet0/0 > > > description to Internet > > > ip address 66.211.51.10 255.255.255.252 > > > ip nat outside > > > load-interval 30 > > > duplex auto > > > speed auto > > > ! > > > interface FastEthernet0/1 > > > description To LAN > > > ip address 192.168.1.1 255.255.255.0 > > > ip nat inside > > > duplex auto > > > speed auto > > > ! > > > interface FastEthernet0/0/0 > > > ! > > > interface FastEthernet0/0/1 > > > ! > > > interface FastEthernet0/0/2 > > > ! > > > interface FastEthernet0/0/3 > > > ! > > > interface Vlan1 > > > no ip address > > > ! > > > ip classless > > > ip route 0.0.0.0 0.0.0.0 66.211.51.9 > > > ! > > > no ip http server > > > ip nat inside source static 192.168.1.2 interface FastEthernet0/0 > > > ! > > > ! > > > control-plane > > > ! > > > banner motd ^C Authorized personel only, please. ^C > > > ! > > > line con 0 > > > line aux 0 > > > line vty 0 4 > > > password cisco > > > login > > > ! > > > scheduler allocate 20000 1000 > > > ! > > > end > > > > _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
