LLQ LAb

2010-12-

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You can download the initial configuration files here.

The only difference between this lab and CBWFQ is making it LLQ. I would not do these one after the other, intersperse another lab, or do CBWFQ and then change it to LLQ.

To prepare for this lab only turn on one 800K link between R1 and R2, and the link between R4 and R1 for traffic generation. If you want traffic to make it around the lab then configure to your hearts content.

On R1:

• Create access lists web, control and print.
• Create class maps web, control and print.
• Put http, ftp, pop3 and smtp in the web class map.
• Put ntp, ssh, telnet and x11 in control.
• Put 9100 in print..
• Create the policy map cbwfq and give these bandwidth percentages; web: 30%, control: 20%, print: 10%.
• Make the control group the priority queue.
• Apply the configuration to S0/0.
• Confirm the configuration and debug it.

Here are the protocols for which traffic is generated from our traffic generation configuration file:

for I in `grep dest-port r4-basic-tgn.cfg | cut -d\   -f 3`; do grep [[:space:]]$I/tcp /etc/services; done
telnet          23/tcp
http            80/tcp
ftp             21/tcp
ntp             123/tcp
pop3            110/tcp
smtp            25/tcp
ssh             22/tcp
x11             6000/tcp
jetdirect       9100/tcp

Answer is below:

R1 Configuration for CBWFQ:

! CEF must be turned on.
ip cef
! 1.  Create the access-list.
ip access-list extended control
 permit tcp any any eq 123
 permit tcp any any eq telnet
 permit tcp any any eq 22
 permit tcp any any eq 6000
ip access-list extended print
 permit tcp any any eq 9100
ip access-list extended web
 permit tcp any any eq www
 permit tcp any any eq ftp
 permit tcp any any eq pop3
 permit tcp any any eq smtp
!
! 2.  Create the class-map.
class-map match-any control
 match access-group name control
class-map match-any web
 match access-group name web
class-map match-any print
 match access-group name print
!
! 3. Create the policy-map.
policy-map cbwfq
 class web
  bandwidth percent 30
 class control
! 3a.  Notice this is the only difference between LLQ and CBWFQ.
  priority percent 20
 class print
  bandwidth percent 10
 class class-default
  fair-queue
!
! 4.  Apply it to the interface.
interface Serial0/0
 bandwidth 800
 ip address 192.168.112.1 255.255.255.0
 service-policy output cbwfq

Confirm the configuration:

sh int s0/0
sh queueing
sh policy-map int s0/0
sh poicy-map int s0/0 output class control

Debug the configuration:

debug priority