Re: Command Question
"clockrate" is the command you would specify in a lab environment to make a serial interface provide clocking for a link. In a normal production environment, the provider would provide the clock and you wouldn't have to set this. "bandwidth," on the other hand, is a configurable parameter which the router uses in determining the "attractiveness" of the link, especially when you're using IGRP or EIGRP. For example, say you've got a 64k link - not very attractive, right? Well, Cisco routers, unless you tell them otherwise via the "bandwidth" command, will assume that every serial interface is running at T1 speed. This will make your 64k link have a lower metric in (E)IGRP than it really should have. It will also affect your load and utilization counters as well. When you set the bandwidth parameter to 64k (which is in accordance with the link's actual speed), the (E)IGRP values will be adjusted accordingly, and more accurate routing will take place. Hope this helps. Sincerely, Bradley J. Wilson CCNA, CCDA, MCSE, CCSE, CNX-A, MCT, CTT Adam Hickey <[EMAIL PROTECTED]> wrote: What is the diference between the "clock rate" command and the "bandwidth" command? Thanks Adam Hickey ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Command Question
with 'clock rate' you can set the clocking of a serial interface used as dce (as example if you use a back-to-back configuration). As example you could set the clock-rate of two 2500 series routers connected back-to-back with their serial interfaces to 400 bits per second to create a 4mbit link. This is possible only on the router with the dce-side of the cable. 'bandwidth' is how the interface speed is reported to the routing pro- tocols. 'bandwith' does not influence the actual speed of the interface but can influence routing decisions (depending on the running routing protocols) Usually it should be necessary only on serial interfaces to set the bandwidth to the actual value. As example the bandwidth of a serial inter- face is by default always configured to 1544 Kbit. group: please correct me if i got something wrong. Reinhold -- Reinhold Fischer CCNP/SCSA/HP Certified Consultant for Network Management On Fri, 1 Sep 2000, Adam Hickey wrote: > What is the diference between the "clock rate" command and the "bandwidth" command? > > Thanks > Adam Hickey > [EMAIL PROTECTED] > > ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Command Question
I also want to add that if you look at the load 1/255 to gauge router loads, it is based on the bandwidth settings. If you have a 56k link but your bandwidth is set to default then you will not get an accurate reading on your load setting. I set the bandwidth setting for this reason on links that are less then the default. - Original Message - From: <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Friday, September 01, 2000 7:31 AM Subject: Re: Command Question > "clockrate" is the command you would specify in a lab environment to make a serial interface provide clocking for a link. In a normal production environment, the provider would provide the clock and you wouldn't have to set this. > > "bandwidth," on the other hand, is a configurable parameter which the router uses in determining the "attractiveness" of the link, especially when you're using IGRP or EIGRP. For example, say you've got a 64k link - not very attractive, right? Well, Cisco routers, unless you tell them otherwise via the "bandwidth" command, will assume that every serial interface is running at T1 speed. This will make your 64k link have a lower metric in (E)IGRP than it really should have. It will also affect your load and utilization counters as well. When you set the bandwidth parameter to 64k (which is in accordance with the link's actual speed), the (E)IGRP values will be adjusted accordingly, and more accurate routing will take place. > > Hope this helps. > > Sincerely, > > Bradley J. Wilson > CCNA, CCDA, MCSE, CCSE, CNX-A, MCT, CTT > > > Adam Hickey <[EMAIL PROTECTED]> wrote: > > What is the diference between the "clock rate" > command and the "bandwidth" command? > > Thanks > Adam Hickey > > ___ > UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html > FAQ, list archives, and subscription info: http://www.groupstudy.com > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] > ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: Command Question
clock rate is normally omitted if your router's DTE interface is connected to a CSU/DSU since the modem will provide the clock rate information. However if you are in a lab scenario whereby you are simulating a Wan by connecting your DTE to your DCE using two Cisco cables then at the DCE end you have to provide the clock rate in order that your serial interface can be up and running. However , bandwidth needs to be supplied no matter you are in lab or practical environments because things like reliability , load etc depends on it to work. Hope that helps Jason -Original Message-From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Adam HickeySent: Saturday, September 02, 2000 6:56 AMTo: [EMAIL PROTECTED]Subject: Command Question What is the diference between the "clock rate" command and the "bandwidth" command? Thanks Adam Hickey [EMAIL PROTECTED]
Re: Command Question
If I set a clock rate of 56000 does that mean that I can not run the interface at say t1 bandwidth? - Original Message - From: Yee, Jason To: 'Adam Hickey' ; '[EMAIL PROTECTED]' Sent: Sunday, September 03, 2000 9:08 PM Subject: RE: Command Question clock rate is normally omitted if your router's DTE interface is connected to a CSU/DSU since the modem will provide the clock rate information. However if you are in a lab scenario whereby you are simulating a Wan by connecting your DTE to your DCE using two Cisco cables then at the DCE end you have to provide the clock rate in order that your serial interface can be up and running. However , bandwidth needs to be supplied no matter you are in lab or practical environments because things like reliability , load etc depends on it to work. Hope that helps Jason -Original Message-From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Adam HickeySent: Saturday, September 02, 2000 6:56 AMTo: [EMAIL PROTECTED]Subject: Command Question What is the diference between the "clock rate" command and the "bandwidth" command? Thanks Adam Hickey [EMAIL PROTECTED]
RE: Command Question
clock
Rate and bandwidth is totally different entities, for live and production
environment clock rate is provided by the modem so you do not need to have to
key in the clock rate
Jason
-Original Message-From: Cisco Kid
[mailto:[EMAIL PROTECTED]]Sent: Monday, September 11, 2000
7:33 AMTo: Yee, Jason; 'Adam Hickey';
[EMAIL PROTECTED]Subject: Re: Command
Question
If I set a clock rate of 56000 does that mean
that I can not run the interface at say t1 bandwidth?
- Original Message -
From:
Yee, Jason
To: 'Adam Hickey' ; '[EMAIL PROTECTED]'
Sent: Sunday, September 03, 2000 9:08
PM
Subject: RE: Command Question
clock rate is normally omitted if your router's DTE
interface is connected to a CSU/DSU since the modem will provide the clock
rate information. However if you are in a lab scenario whereby you are
simulating a Wan by connecting your DTE to your DCE using two Cisco cables
then at the DCE end you have to provide the clock rate in order that your
serial interface can be up and running.
However , bandwidth needs to be supplied no matter
you are in lab or practical environments because things like reliability ,
load etc depends on it to work. Hope that helps
Jason
-Original Message-From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of Adam
HickeySent: Saturday, September 02, 2000 6:56 AMTo:
[EMAIL PROTECTED]Subject: Command
Question
What is the diference between the "clock
rate" command and the "bandwidth" command?
Thanks
Adam Hickey
[EMAIL PROTECTED]
RE: Command Question
but ina a test environment where you have a DCE/DTE crossover and you supply clock rate (as required in this config), you are running that circuit at the speed you specify in the clock rate. Test it this way: set the clock rate for 56000, then do a ping with say 50 packets (use extended ping). Notice the speed of the "!". Change the clock rate to 100 and ping again - notice the dramatic speed increase. The bandwidth doesn't change the speed of the circuit, either in production (where clocking is external to the router) or in test (where you have one router supply clocking). But as mentioned below, it is important in all cases to set bandwidth to the speed of the circuit because that is what routing protocols use to calculate their metrics. >>> "Yee, Jason" <[EMAIL PROTECTED]> 09/12 1:37 AM >>> clock Rate and bandwidth is totally different entities, for live and production environment clock rate is provided by the modem so you do not need to have to key in the clock rate Jason -Original Message- From: Cisco Kid [mailto:[EMAIL PROTECTED]] Sent: Monday, September 11, 2000 7:33 AM To: Yee, Jason; 'Adam Hickey'; [EMAIL PROTECTED] Subject: Re: Command Question If I set a clock rate of 56000 does that mean that I can not run the interface at say t1 bandwidth? - Original Message - From: Yee, Jason <mailto:[EMAIL PROTECTED]> To: 'Adam Hickey' <mailto:[EMAIL PROTECTED]> ; '[EMAIL PROTECTED]' Sent: Sunday, September 03, 2000 9:08 PM Subject: RE: Command Question clock rate is normally omitted if your router's DTE interface is connected to a CSU/DSU since the modem will provide the clock rate information. However if you are in a lab scenario whereby you are simulating a Wan by connecting your DTE to your DCE using two Cisco cables then at the DCE end you have to provide the clock rate in order that your serial interface can be up and running. However , bandwidth needs to be supplied no matter you are in lab or practical environments because things like reliability , load etc depends on it to work. Hope that helps Jason -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Adam Hickey Sent: Saturday, September 02, 2000 6:56 AM To: [EMAIL PROTECTED] Subject: Command Question What is the diference between the "clock rate" command and the "bandwidth" command? Thanks Adam Hickey [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: command question [7:51852]
soonkyoung kwon wrote: > > dear all > please teach me below command's mean > > map-list atm > ip xxx.xxx.xxx.xxx atm-vc yyy broadcast Here's the URL to Cisco's documentation: http://www.cisco.com/univercd/home/home.htm Yes, it can be hard to find stuff there. But not too bad. You should know which IOS version you are using to start with. If it's the latest, just go to the link called "Current Cisco IOS Release" under "Hot Items." If it's not the latest release, simply use the pull-down menu titled "Cisco IOS Software" near the top of the page to select your release. >From either of these places, when you are just looking up a single command, sometimes the Master Index is the best place to start. Sometims the Master Index can lead you astray however. In that case, you have to have some idea which document will help you best. In most cases, the Configuration Guides and Command References are most helpful. >From there you have to know that commands dealing with ATM are in the WAN section. Also, see if you can figure out what the command means on your own. What sort of "mapping" might have to happen when dealing with IP and ATM? What is that IP address in the command? Do you recognize it from somewhere else in the config or from some of the output of show commands? Why would you want to use a static map? Are there other solutions (such as Inverse ARP?) Why might you care about broadcasts? Where else do you see map lists? Does Frame Relay use them also? Priscilla Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=51854&t=51852 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
