Re: No can do [7:34864]
You can connect two routers back-back using frame relay encaps. It must be done on subinterfaces.. - Original Message - From: Chris Charlebois To: Sent: Friday, February 08, 2002 5:50 PM Subject: No can do [7:34864] You cannot simulate frame-relay with 2 routers. A minimuim of three are required. One router must serve as the frame-relay switch. This router needs to be connected to both other routers via back-to-back serial connections. In many ways, frame-relay is analogous to IP. It's just one more set removed. In frame-relay, a router will segment data into frame-relay packets and address them using the DLCI. These packets are sent to the frame-relay provider. The frame-relay provider's equipment (referred to as a switch) passes the packet to another switch based on the DLCI. I don't really know how many switches a common frame-relay packet goes through, but it doesn't really matter, because it will come out in the right place on the other router. The other router accepts the data, reassembles it into the original form and routes it accordingly. The trick is, frame-relay was never meant to operate back-to-back. Therefore, each router needs to be directly connected to a frame-relay switch. I don't have a link to help in that configuration, but if you get a third router, I can dig something up. Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=34918t=34864 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: No can do [7:34864]
Your answer is logical, but not true for Cisco. Cisco lets you do back-to-back Frame Relay. I think they added it mostly to allows training classes to save on equipment costs! If a person can afford to use a router in the middle as a switch, it really enables a better understanding of Frame Relay. When you configure the switch especially, light bulbs often go off. The back-to-back stuff, on the other hand, muddies one's understanding. But it should work. Just make one the DCE, add clocking, and the frame-relay switching command. Priscilla At 05:50 PM 2/8/02, Chris Charlebois wrote: You cannot simulate frame-relay with 2 routers. A minimuim of three are required. One router must serve as the frame-relay switch. This router needs to be connected to both other routers via back-to-back serial connections. In many ways, frame-relay is analogous to IP. It's just one more set removed. In frame-relay, a router will segment data into frame-relay packets and address them using the DLCI. These packets are sent to the frame-relay provider. The frame-relay provider's equipment (referred to as a switch) passes the packet to another switch based on the DLCI. I don't really know how many switches a common frame-relay packet goes through, but it doesn't really matter, because it will come out in the right place on the other router. The other router accepts the data, reassembles it into the original form and routes it accordingly. The trick is, frame-relay was never meant to operate back-to-back. Therefore, each router needs to be directly connected to a frame-relay switch. I don't have a link to help in that configuration, but if you get a third router, I can dig something up. Priscilla Oppenheimer http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=34919t=34864 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: No can do [7:34864]
Oh yes you can...read this:http://www.cisco.com/warp/public/125/frbacktoback.html Extract from the link: Introduction This document is a sample configuration for setting up two Cisco routers back-to-back using Frame Relay (FR) encapsulation. The routers are connected using data communications equipment (DCE) and a data terminal equipment (DTE) serial cable. Back-to-back setups are useful in test environments. The simplest and preferred method for configuring back-to-back setups is described in this document. A FR switch or DCE device is used between FR routers to provide Local Management Interface (LMI) status messages. Because there is no switch in a back-to-back scenario, LMI processing is disabled on both routers. You also can configure a back-to-back setup with one router providing LMI status updates for the other. However, such a configuration is necessary only if the LMI debugging messages are to be checked in a back-to-back setup. In this case, LMI processing is not disabled and one side functions as a hybrid FR switch by responding to LMI status enq. For more details on this configuration, please see Back-to-Back Frame Relay Hybrid Switching. In the sample configuration, the router connected to the DCE cable must provide clocking. Router1 provides the clock at 64 kbps (clock rate 64000). Hardware and Software Versions To implement this configuration, you need the following hardware and software components: Cisco IOS® Software Release 10.0 and later that supports FR encapsulation. Two routers, each with an interface that supports FR encapsulation. Note: The information in this document was taken from an isolated lab environment. Make sure you understand the potential impact of a command on your network before you use it. This configuration was developed and tested using the software and hardware versions below. Cisco IOS Software Release 12.1(2). Cisco 1604 routers. All the best, Yeti-GBR1 aka A complete Lunatic Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=34920t=34864 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: No can do [7:34864]
Can even do direct...just on the intf. itself but also can do on the subif as you mentioned :-) From: Curtis Phillips Reply-To: Curtis Phillips To: [EMAIL PROTECTED] Subject: Re: No can do [7:34864] Date: Fri, 8 Feb 2002 18:18:03 -0500 You can connect two routers back-back using frame relay encaps. It must be done on subinterfaces.. - Original Message - From: Chris Charlebois To: Sent: Friday, February 08, 2002 5:50 PM Subject: No can do [7:34864] You cannot simulate frame-relay with 2 routers. A minimuim of three are required. One router must serve as the frame-relay switch. This router needs to be connected to both other routers via back-to-back serial connections. In many ways, frame-relay is analogous to IP. It's just one more set removed. In frame-relay, a router will segment data into frame-relay packets and address them using the DLCI. These packets are sent to the frame-relay provider. The frame-relay provider's equipment (referred to as a switch) passes the packet to another switch based on the DLCI. I don't really know how many switches a common frame-relay packet goes through, but it doesn't really matter, because it will come out in the right place on the other router. The other router accepts the data, reassembles it into the original form and routes it accordingly. The trick is, frame-relay was never meant to operate back-to-back. Therefore, each router needs to be directly connected to a frame-relay switch. I don't have a link to help in that configuration, but if you get a third router, I can dig something up. _ MSN Photos is the easiest way to share and print your photos: http://photos.msn.com/support/worldwide.aspx Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=34926t=34864 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
