Re: QOS and CBWFQ

From: Cristian Henry H (chenry@reuna.cl)
Date: Tue Jul 08 2003 - 11:38:46 GMT-3

Brit,

I was thinking about it, and the "police 308800 ..." will control the
maximun allowed bandwith for the class, but at congestion time with
CBWFQ options, only the "bandwith" option give you the wanted bandwith,
so if you want to get , at time of congestion, the same bandwith you
have to config an absolute reservation with "bandwith 308800" for
instance. If you config "bandwith percent 20" you will get just the 20%
of available bandwith (75% of Configured_Bandwidth), that is
1544000*.75*.20 = 231600 bps.
Otherway, with police options you are avoiding congestion, so I think
you don't need to config CBWFQ bandwith options to reserv bandwith.
Right?

"Brit Walker (brwalker)" ha escrito:
>
> Thank you.
>
> Brit
>
> -----Original Message-----
> From: Cristian Henry H [mailto:chenry@reuna.cl]
> Sent: Monday, July 07, 2003 11:54 AM
> To: Brit Walker (brwalker)
> Cc: ccielab@groupstudy.com
> Subject: Re: QOS and CBWFQ
>
> 1) I would use the Cisco's recommendation to config CAR
>
> "Cisco recommends the following values for the normal and extended burst
> parameters:
>
> normal burst = configured rate * (1 byte)/(8 bits) * 1.5 seconds
> extended burst = 2 * normal burst
> "
> So, I would config the following (I suposse S8 is a T1):
>
> class CLASS2
> police 308800 57900 115800 conform-action transmit exceed-action
> drop
> class CLASS3
> police 463200 86850 173700 conform-action transmit exceed-action
> drop
>
> 2) Why do you only match router's interface's IP as IP source address?
>
> I would config the following:
>
> access-list 2 permit subnets behind R2
> access-list 2 remark Traffic from R2
> access-list 3 permit subnets behind R3
> access-list 3 remark Traffic from R3
>
> 3) Question, Is necesary config "bandwith percent" on CBQF classes?
>
> Is my opinion, Any update?
>
> "Brit Walker (brwalker)" ha escrito:
> >
> > Take a look at the following scenario and configuration. I do not
> > believe this config is correct. I wanted to get some feedback on it to
>
> > help get it correct.
> >
> >
> >
> >
> > FR will be accepting streaming TCP traffic from R2 and R3
> > on Ethernet 0 and passing traffic out interface Serial 8 (pretend it's
>
> > a high-speed interface). Configure FR to avoid congestion for outbound
>
> > traffic on Serial 8. Do not use tail drop as the congestion avoidance
> > mechanism. Devise and apply a traffic management scheme using the
> > follwing criteria.
> >
> > - Use a policy named MY-POLICY
> > - Use classes named CLASS2 for R2 traffic and CLASS3 for R3 traffic.
> > Match all traffic for each and have any access lists correspond to the
>
> > number in each router's name.
> > - Avoid congestion ny dropping R2 traffic that exceeds 20 % of the
> > total bandwidth and R3 traffic that exceeds 30 % of the total
> > bandwidth.
> > - Use access list 2 to match input traffic from R2 and access list 3
> > to match input traffic from R3.
> > - Include some type of descriptive comment with each access list.
> > - Apply the policy to FR's Serial 8 interface, the egress interface.
> >
> >
> >
> >
> >
> >
> >
> > fr#wri t
> > Building configuration...
> >
> > 02:31:09: %SYS-5-CONFIG_I: Configured from console by console Current
> > configuration : 3489 bytes !
> > version 12.2
> > service timestamps debug uptime
> > service timestamps log uptime
> > no service password-encryption
> > !
> > hostname fr
> > !
> > enable password cisco
> > !
> > ip subnet-zero
> > ip tcp synwait-time 5
> > no ip domain-lookup
> > ip host r1 192.100.1.1
> > ip host r2 192.100.2.2
> > ip host r3 192.100.3.3
> > ip host r4 192.100.4.4
> > ip host r5 192.100.5.5
> > ip host r6 192.100.6.6
> > ip host fr 192.100.7.7
> > !
> > frame-relay switching
> > !
> > class-map match-all CLASS2
> > match access-group 2
> > class-map match-all CLASS3
> > match access-group 3
> > !
> > !
> > policy-map MY-POLICY
> > class CLASS2
> > bandwidth percent 20
> > police 300000 9375 9375 conform-action transmit exceed-action
> drop
> > class CLASS3
> > bandwidth percent 30
> > police 460000 14375 14375 conform-action transmit exceed-action
> > drop
> > !
> > !
> > key chain trees
> > key 1
> > key-string cisco
> > !
> > !
> > !
> > !
> > interface Loopback0
> > ip address 192.100.7.7 255.255.255.0
> > !
> > interface Loopback150
> > ip address 150.150.100.7 255.255.255.0
> > !
> > interface Ethernet0
> > ip address 172.16.237.7 255.255.255.0
> > !
> > interface Serial0
> > description TO R1
> > no ip address
> > encapsulation frame-relay
> > no fair-queue
> > clockrate 64000
> > frame-relay intf-type dce
> > frame-relay route 102 interface Serial1 201
> > frame-relay route 103 interface Serial2 301
> > frame-relay route 104 interface Serial3 401
> > !
> > interface Serial1
> > description TO R2
> > no ip address
> > encapsulation frame-relay
> > no fair-queue
> > clockrate 64000
> > frame-relay intf-type dce
> > frame-relay route 201 interface Serial0 102
> > frame-relay route 203 interface Serial2 302
> > frame-relay route 204 interface Serial3 402
> > !
> > interface Serial2
> > description TO R3
> > no ip address
> > encapsulation frame-relay
> > no fair-queue
> > clockrate 64000
> > frame-relay intf-type dce
> > frame-relay route 301 interface Serial0 103
> > frame-relay route 302 interface Serial1 203
> > frame-relay route 304 interface Serial3 403
> > !
> > interface Serial3
> > description TO R4
> > no ip address
> > encapsulation frame-relay
> > no fair-queue
> > clockrate 64000
> > frame-relay intf-type dce
> > frame-relay route 401 interface Serial0 104
> > frame-relay route 402 interface Serial1 204
> > frame-relay route 403 interface Serial2 304
> > !
> > interface Serial8
> > ip address 120.20.70.7 255.255.255.0
> > service-policy output MY-POLICY
> > clockrate 64000
> > !
> > router eigrp 1
> > variance 2
> > redistribute eigrp 27 metric 64 100 255 1 1500
> > network 172.16.237.0 0.0.0.255
> > network 192.100.7.0
> > neighbor 172.16.237.2 Ethernet0
> > neighbor 172.16.237.3 Ethernet0
> > maximum-paths 2
> > no auto-summary
> > !
> > router eigrp 27
> > redistribute eigrp 1 metric 64 100 255 1 1500
> > network 120.0.0.0
> > neighbor 120.20.70.254 Serial8
> > distribute-list 1 in Serial8
> > no auto-summary
> > !
> > router bgp 7
> > no synchronization
> > bgp router-id 192.100.7.7
> > bgp log-neighbor-changes
> > network 150.150.100.0 mask 255.255.255.0
> > neighbor 172.16.237.2 remote-as 2
> > neighbor 172.16.237.2 password cisco
> > neighbor 172.16.237.3 remote-as 3
> > neighbor 172.16.237.3 password cisco
> > !
> > no ip classless
> > ip http server
> > !
> > access-list 1 permit 170.70.0.0 0.0.255.255
> > access-list 2 permit 172.16.237.2
> > access-list 2 remark Traffic from R2
> > access-list 3 permit 172.16.237.3
> > access-list 3 remark Traffic from R3
> > !
> > line con 0
> > exec-timeout 0 0
> > line aux 0
> > password cisco
> > login
> > line vty 0 4
> > exec-timeout 0 0
> > password cisco
> > login
> > !
> > end
> >
> >
> > fr#sh policy MY-POLICY
> > Policy Map MY-POLICY
> > Class CLASS2
> > Bandwidth 20 (%) Max Threshold 64 (packets)
> > police 300000 9375 conform-action transmit exceed-action drop
> > Class CLASS3
> > Bandwidth 30 (%) Max Threshold 64 (packets)
> > police 460000 14375 conform-action transmit exceed-action drop
> > fr#
> >
> > ______________________________________________________________________
> > _
> > You are subscribed to the GroupStudy.com CCIE R&S Discussion Group.
> >
> > Subscription information may be found at:
> > http://www.groupstudy.com/list/CCIELab.html
>
> --
> Cristian E. Henry
> REUNA
>
> E-mail: chenry@reuna.cl
> Fono: 56-2-3370336 

-- 
Cristian E. Henry
REUNA

E-mail: chenry@reuna.cl
Fono: 56-2-3370336

This archive was generated by hypermail 2.1.4 : Wed Aug 06 2003 - 06:52:28 GMT-3