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cbwfq on multilink laboratory setup

 
 
b0y37 b0y37 is offline
Junior Member
Join Date: Nov 2007
Posts: 3
 
      11-29-2007
Hi there.

I have a multilink laboratory setup, composed of two Cisco routers back to back connected by dce/dte cable. One is an Cisco ISR 1841 and the other is a Cisco3745.I configured both of them for multilink and setup a cbwfq for qos. But it appears that (my monitoring tool is PRTG, btw) the routers does not dedicate the bandwidth that i specified between two hosts.

For reference, "sh ver" output from the 1841:

Cisco IOS Software, 1841 Software (C1841-IPBASE-M), Version 12.3(T11, RELEASE
SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2005 by Cisco Systems, Inc.
Compiled Wed 10-Aug-05 15:43 by dchih

ROM: System Bootstrap, Version 12.3(8r)T9, RELEASE SOFTWARE (fc1)

And here is my running config:Current configuration : 1617 bytes
!
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname ISR1841
!
boot-start-marker
boot-end-marker
!
no logging console
!
mmi polling-interval 60
no mmi auto-configure
no mmi pvc
mmi snmp-timeout 180
no aaa new-model
ip subnet-zero
ip cef
!no ip domain lookup
no ftp-server write-enable
!
!
!
class-map match-any MIX
description prioritize critical traffic
match access-group 102
!
!
policy-map prioritize_mimix
class MIX
priority 5000
class class-default
fair-queue
!
!
!
interface Multilink1
ip address 10.1.0.154 255.255.255.252
service-policy output prioritize_mimix
max-reserved-bandwidth 80
ppp multilink
ppp multilink fragment delay 1
ppp multilink interleave
ppp multilink group 1
ppp multilink multiclass
!
interface FastEthernet0/0
ip address 10.89.0.254 255.255.0.0
duplex auto
speed auto
!
interface FastEthernet0/1
no ip address
duplex auto
speed auto
!
interface Serial0/1/0
bandwidth 4000
ip address 192.168.1.2 255.255.255.0
encapsulation ppp
no fair-queue
ppp multilink
ppp multilink group 1
!
interface Serial0/1/1
bandwidth 4000
ip address 192.168.2.2 255.255.255.0
encapsulation ppp
no fair-queue
ppp multilink
ppp multilink group 1
!
interface Async0/0/0
no ip address
!
interface Async0/0/1
no ip address
!
ip classless
ip route 10.88.0.0 255.255.0.0 10.1.0.153
ip route 10.90.0.0 255.255.0.0 10.1.0.153
ip http server
!
!
access-list 102 permit ip any host 10.88.0.1
ip classless
ip route 10.88.0.0 255.255.0.0 10.1.0.153
ip route 10.90.0.0 255.255.0.0 10.1.0.153
ip http server
!
!
access-list 102 permit ip any host 10.88.0.1
!I even tried access-list 102 permit ip host 10.89.0.1 host 10.88.0.1
!
control-plane
!
!
line con 0
line aux 0
line 0/0/0 0/0/1
stopbits 1
speed 115200
flowcontrol hardware
line vty 0 4
login
!
end

"sh ver" for the C3745:
IOS (tm) 3700 Software (C3745-I-M), Version 12.2(13)T1, RELEASE SOFTWARE (fc1)
TAC Support: http://www.cisco.com/tac
Copyright (c) 1986-2003 by cisco Systems, Inc.
Compiled Fri 03-Jan-03 15:12 by ccai
Image text-base: 0x60008940, data-base: 0x60C28000

ROM: System Bootstrap, Version 12.2(8r)T2, RELEASE SOFTWARE (fc1)

Running config for the cisco3745:

version 12.2
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname C3745
!
no logging console
no logging monitor
!
ip subnet-zero
!
!
no ip domain lookup
!
class-map match-any MIX
description prioritize critical traffic
match access-group name mimix_priority

!policy-map mimix
class MIX
priority 5000
class class-default
bandwidth 1000
!
!
!
!
!
interface Multilink1
ip address 10.1.0.153 255.255.255.252
max-reserved-bandwidth 80
service-policy output mimix
ppp multilink
ppp multilink fragment-delay 1
ppp multilink interleave
multilink-group 1
!
interface FastEthernet0/0
ip address 10.88.0.254 255.255.0.0
duplex auto
speed auto
!
interface FastEthernet0/1
ip address 10.90.0.254 255.255.0.0
duplex auto
speed auto
!
interface FastEthernet4/0
no ip address
shutdown
duplex auto
speed auto
!
interface Serial4/0
ip address 192.168.1.1 255.255.255.0
bandwidth 4000
encapsulation ppp
clockrate 4000000
no fair-queue
ppp multilink
multilink-group 1
!
interface FastEthernet4/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial4/1
bandwidth 4000
ip address 192.168.2.1 255.255.255.0
encapsulation ppp
clockrate 4000000
no fair-queue
ppp multilink
multilink-group 1
!
ip flow-export version 5
ip flow-export destination 10.89.0.1 17
ip classless
ip route 10.89.0.0 255.255.0.0 10.1.0.154
ip http server
!
!
ip access-list extended mimix_priority
permit ip host 10.88.0.1 host 10.89.0.1

!
snmp-server community ****** RO
snmp-server enable traps tty
snmp-server host 10.88.0.1 ******
!
line con 0
line aux 0
line vty 0 4
login
!
end


I tested my setup using various ftp sessions between
10.89.0.1 (server) to 10.88.0.1 and 10.90.0.1. But i noticed that the bandwidth are just divided equally among the ftp sessions(fair-queue?). My goal is to have a constant 5Mbps between 10.89.0.1 and 10.88.0.1.

When I measured the bandwidth using PRTG, I got 8Mb. I monitored 3 Ports of the 3745 - multilink1, fa0/0 and fa0/1. I got a constant 8Mb on multilink1and varying BW on fa ports depending on the number of ftp sessions. I have one ftp session between 10.88.0.1 and 10.89.0.1. And 4 ftp sessions between 10.90.0.1 and 10.89.0.1. I noticed that Fa0/1 has a higher bandwidth, which is equal to (ftp sessions on fa0/1) / (ftp sessions on fa0/0 and fa0/1) x 8Mbps. This looks like fair-queue, doesnt it?

Any more ideas?
TIA
 
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