http://www.firstdigest.com Cisco | How to do it Thu, 20 Nov 2008 14:29:02 +0000 http://backend.userland.com/rss092 en I had lately to configure compressed real-time protocols (CRTP) over a Frame-relay link. I thought that it will be good to make a tutorial about how to configure this on the Serial interfaces (with HDLC or PPP encapsulation) and on the Frame-relay interface. Another type of interface supporting this is and ... http://www.firstdigest.com/2008/11/cisco-configuring-compressed-real-time-protocols/ Some time ago a person asked me to set the HTTP traffic to 256 kbits during weekdays from 8:00 - 16:00, to limit "the fun" in the office while other are working. In theory I'm against this type of policy, because if you have a team of network engineers and ... http://www.firstdigest.com/2008/11/cisco-how-to-limit-http-traffic-on-weekdays-during-working-hours/ In this tutorial I propose to show something that is not very used these days, or at least not every day, but which can be tricky if you don't know how to approach this type of configuration. To understand this, I assume that you know the basics about PPP, FR ... http://www.firstdigest.com/2008/11/cisco-multilink-ppp-over-frame-relay-mlpofr/ In a well controlled environment, false information routing should not reach your OSPF domain, as network engineer take care what to advertise and what not into OSPF. But there are cases when you have to deal with 3rd party companies somehow, and you want to be sure that nothing in ... http://www.firstdigest.com/2008/11/cisco-deny-false-information-routing-injection-into-ospf-domain/ From the beginning let me tell you that I don't see very useful this command, as I prefer to use "interface range..." syntax, but since I saw it as a requirement in one of the task for CCIE RS lab exam, and maybe somebody will find it usable in real ... http://www.firstdigest.com/2008/11/interface-macro-command-on-a-cisco-switch/ Let's say that somebody (or some task in a test) ask you to limit the inbound traffic on a switch Layer 2 port by using minimal configuration possible. I must say that in the first steps I failed this task miserable, but actually is very simple to do it. I will ... http://www.firstdigest.com/2008/11/limit-traffic-on-a-cisco-switch-with-minimal-configuration/ This is pretty old trick, so maybe  you already know it, but for the rest of you, it can be interresting. You just had a crash on you Cisco hardware and you have the logs, but don't know exactly what caused this crash. You tried to have the device crash again, ... http://www.firstdigest.com/2008/11/cisco-hidden-tool-test-crash/ Let's say that you have a link configured with Frame-Relay and from time to time you observe that the link is having some strange problems. Since you cannot be sure that the link is provided 100% error free you want to do your own tests. You want to see if ... http://www.firstdigest.com/2008/11/frame-relay-pvc-test-with-ping-to-own-interface/ Sometimes you have a connection between 2 routers that you want to test with something more than a ping. Cisco devices have a hidden command which is actually a very powerful testing tool for your TCP connection. The command is "ttcp" and you will not find it in the the default ... http://www.firstdigest.com/2008/11/cisco-hidden-tools-testing-tcp-connection/ Many of you already know that usually when you advertise a Loopback interface into OSPF it is advertised with /32 netmask (one IP address) even if the IP address under Loopback interface is with a /24 netmask. If you checked my previous post, you'll see at the end that I'm ... http://www.firstdigest.com/2008/11/how-to-force-loopack-interface-to-be-advertised-as-24-subnet/