If you have an external CSU/DSU then the router has no idea what the actual speed of the link is. The default bandwidth configured on a serial interface is 1.544 Mbps, but that means nothing. You could have a 56k line and the router would still have 1.544 Mbps configured. As far as I know, there is no way--from IOS--to definitely prove the link speed in a situation like this. Sometimes you can tell from the circuit ID itself what the link speed is, depending on the provider. For instance, with our provider, any circuit ID that contains QGEA, HCGL, or YBGA is a T-1, while YGGA is a fractional T-1 and XHGL is 56k frame relay. Sorry, I know that doesn't help much. You can try doing a 'show frame map' and looking at the CIR. If the CIR was automatically assigned, it's usually some percentage of the actual link speed. With our provider, the default CIR on a PVC on a t-1 is 768000. Good luck! John >>> <[EMAIL PROTECTED]> 3/30/01 1:53:14 AM >>> this is only if I know that the link is a T1. But what if I don't know the speed of the link ? Is there a way to check this out. Regards, Tarry -----Original Message----- From: John Neiberger [mailto:[EMAIL PROTECTED]] Sent: Thursday, March 29, 2001 5:27 PM To: [EMAIL PROTECTED] Cc: [EMAIL PROTECTED] Subject: Re: actual speed (BW) on a Frame-Relay circuit This is actually more complicated than you think. :-) Which do you want to know, the speed of the link or the available bandwidth? If it's the latter, what do you mean by available? Do you want to know the CIR? Or how much you can burst over your CIR? Let's say you have a frame relay T-1. The speed of that link is always 1.544 Mbps. If you send data across that link, regardless of the CIR, the data is travelling at 1.544 Mbps! Because it's frame relay, you might be paying for a certain CIR which is a statistical parameter that sometimes doesn't have much to do with how much data you can push across that link. In fact, if your provider isn't experiencing any congestion, then CIR doesn't mean squat as far as I'm concerned. Whenever you exceed your CIR, frames in the cloud can be marked as Discard Eligible. All that means is that during times of congestion, those get dropped first. If there's no congestion, DE status doesn't mean much. So, to answer your question... The speed of the link is whatever your link speed is. <g> The CIR can usually be seen by using the command "show frame-relay map". I hope that helps and didn't just confuse the issue more. I may have been imprecise, and if I have others will surely correct me. Regards, John >>> <[EMAIL PROTECTED]> 3/29/01 6:57:53 AM >>> Hi, is there a command to check the actual speed (BW) or max BW used on a Frame-Relay circuit. Thanks, Tarry. -- GMX - Die Kommunikationsplattform im Internet. http://www.gmx.net _________________________________ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _________________________________ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
