RE: Ethernet Collisions
Collisions are usually normal, that's what CSMA/CD is based on. However, I would check the following: 1)Check switch port statistics from the switch where the router connects to, I would be more worry on Runts than collisitons. 2)Check Duplex transmission 10 half at both ends forced 3)Check cables from router to switch I am currious to see more input on this from the group. --Original Message-- From: "Mike Baker" [EMAIL PROTECTED] To: "[EMAIL PROTECTED]" [EMAIL PROTECTED] Sent: August 18, 2000 12:28:00 PM GMT Subject: Ethernet Collisions What could be possible reasons for getting collisions between a router and a catalyst switch? The link is 10mbps. Michael K. Baker Telecom Network Analyst ALLTEL Information Services 2000 Highland Road Twinsburg, Ohio 44087 330-963-1648 www.alltel.com INIHGROBMALATNAWI ___ 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] Jorge Rodriguez /CCNA Network Analyst RS Networks Inc 1112 Boylston Street Suite 222 Boston, MA 02115 1-781-614-1294 1-617-989-8634 Evenings http://www.netwire.n3.net/ http://www.learncisco.n3.net/ . voted #1 search engine! http://www.iwon.com why wouldn't you? . ___ 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: Ethernet Collisions
Hi Mike - I'd like to know how many collisions you're seeing. It might be well within normal parameters for ethernet. However, I'd also recommend changing from 10mbps shared to 100mbps full duplex - you'll get much better throughput, no collisions at all, and you've probably already got the hardware to do it. Sincerely, Bradley J. Wilson CCNA, CCDA, MCT, CCSE Boston, Mass. --Original Message-- From: "Mike Baker" To: "[EMAIL PROTECTED]" Sent: August 18, 2000 12:28:00 PM GMT Subject: Ethernet Collisions What could be possible reasons for getting collisions between a router and a catalyst switch? The link is 10mbps. Michael K. Baker Telecom Network Analyst ALLTEL Information Services 2000 Highland Road Twinsburg, Ohio 44087 330-963-1648 www.alltel.com INIHGROBMALATNAWI ___ 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: Ethernet Collisions
If the router and the switch are the only devices connected, say by a cross over cable, I would first make the assumption that the crossover cable is at fault. Next, I believe all of the 10Mb router interfaces are half-duplex, so I would ensure the switch port is set to half-duplex and 10Mb (don't let the switch auto configure the connection) Last the only time I have personally seen this was when the network had multiple subnets configured with workstations at 100Mb, and the router had to route between them. This was during an IP address conversion that wasn't quite completed. (Servers were left on one subnet while workstation were on another.) Workstations would negotiate a 100Mb, full duplex connection... then try to talk to a server (same broadcast domain, different subnet) at 100Mb full-duplex. The bottleneck was the router at 10Mb half-duplex. Ed Moss CCNP, CCDP, CNE "Mike Baker" [EMAIL PROTECTED] wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... What could be possible reasons for getting collisions between a router and a catalyst switch? The link is 10mbps. Michael K. Baker Telecom Network Analyst ALLTEL Information Services 2000 Highland Road Twinsburg, Ohio 44087 330-963-1648 www.alltel.com INIHGROBMALATNAWI ___ 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: Ethernet Collisions
Collisions using 10BaseT, half-duplex ethernet are to be expected. They are the rule, not the exception, and unless you are getting an exceptionally high ratio of collisions to frames output, I wouldn't worry about it. Now, if you were seeing LATE collisions between the router and the switch, I would think that you have the switchport set for full duplex, which will cause late collisions if connected to a half duplex device. HTH, John Neiberger BTW, do you know Rhett Folse at Alltel? If so, tell him hi for me! What could be possible reasons for getting collisions between a router and a catalyst switch? The link is 10mbps. Michael K. Baker Telecom Network Analyst ALLTEL Information Services 2000 Highland Road Twinsburg, Ohio 44087 330-963-1648 www.alltel.com INIHGROBMALATNAWI ___ 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] ___ Say Bye to Slow Internet! http://www.home.com/xinbox/signup.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]
