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  • Cisco Routers Per Head Help, CCIE lab - CCIE training - CCNP, CCNA Cisco Router Forum, Certification
    on Open Source Routers Courtney Love explains the basics of BGP Jennifer Connolly on CCIE Lab Changes Juliette Lewis Troubleshoots Frame Relay Paris Hilton On CCIE Storage Gillian Anderson on LAN Switching Part 1 Nightmare on Tasman Street Gillian Anderson on LAN Switching Part2 Gunney Sgt Hartman at CCNA Boot Camp The OSI Model Paul Hogan Tells Us About HSRP Elizabeth Hurley On the Cisco 2600 Series Drunken Dwarf Dissects DHCP Arnold on PIX Turbo Access Lists Cisco Psychic Helpdesk Robert Downey Jr On Ethernet Fabio on IGRP Runaway Bride Jennifer Wilbanks On Power Over Ethernet Runaway Bride Jennifer Wilbanks On Power Over Ethernet Trinity on IP Helper addresses Max Throughput CCIE Denise Richards On the PIX Firewall Inside The CCIE Lab Gary Coleman on Priority Queuing Agent Smith Explains Syslog Alicia Silverstone on ISDN Charles Manson On Static Routes Anna Nicole Smith on Cat 1900 The Iraqi Information Minister Tells All Mister Rogers on the RS 232 Tonya Harding on the 700 Series Don King on IP Access Lists 7 of 9 on OSPF Part 1 7 of 9 on OSPF Part 2 Darva Conger on the Config Register Menu Home Contact Router Certifications CCIE CCNP CCNA Pay Per Head Want to contribute to RouterGod Send an email to bill routergod com Search Archives Jessica Simpson on Open Source Routers Courtney Love explains the basics of BGP Jennifer Connolly on CCIE Lab Changes Juliette Lewis Troubleshoots Frame Relay Paris Hilton On CCIE Storage Gillian Anderson on LAN Switching Part 1 Nightmare on Tasman Street Gillian Anderson on LAN Switching Part2 Gunney Sgt Hartman at CCNA Boot Camp The OSI Model Pay per head Services Paul Hogan Tells Us About HSRP Elizabeth Hurley On the Cisco 2600 Series Drunken Dwarf Dissects DHCP Arnold on PIX Turbo Access Lists Cisco Psychic

    Original URL path: http://www.routergod.com/ (2016-04-27)
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  • When things are not on the up and up...
    All depends who s asking I smugly intoned I called you thanks for meeting me she said with a voice that was so husky it could pull a dogsled I hope you can help my router has quit working and if I don t get it fixed today my boss will fire me she said breathlessly Sure cream puff I can help you but there s the small matter of my fee I said She leaned into me and in a conspiratorial tone said What ever the cost I will pay it Please Mr Throughput you re my only hope she pleaded I looked her over with a studied eye I took note of the Cartier wristwatch the Gucci handbag the unmistakable swell of her breast implants No doubt about it this broad was loaded Five hundred dollars and you pay for breakfast I said Oh thank you Max she gushed After I finished my third breakfast she paid the check and I followed her out to her car As we got into her Mercedes 560 I silently admonished myself for not charging her more She drove us through the mean streets of Los Angeles and into the sexually ambiguous area of West L A Soon we arrived at a nondescript building off Wilshire I followed her to the entrance admiring the womanly sway of her hips this dame was definitely a looker S he opened the door and led me to the computer room It was the usual computer room raised floor racks and racks of servers and assorted networking gear Then my eyes settled on it a Cisco 2620 with a console cable leading to a notebook PC Is that the little bugger I asked already knowing the answer Yes please see what you can do she said No problem dumpling just relax while I work my magic I responded coolly I sat down at the computer flicked my cigarette butt into a nearby box full of DLT tapes and entered the command show run The Cisco router obediently coughed up it s config Perusing its contents I noticed that this router was configured for inter VLAN routing or Router on a stick as we say in my line of work That means that the FastEthernet port was divided into sub interfaces and was trunked to a switch somewhere I noticed that the encapsulation was ISL Cisco s proprietary trunking encapsulation Using ISL encapsulation shows breeding and good taste who ever configured this router was no slouch Well the config looked fine no problems other than the type 7 encryption on the password Next I entered the command show ip route and what I saw even shocked a grizzled CCIE like myself no routes Nada zilch zero goose egg you get the picture L et me explain something to you directly connected interfaces that are active should always show up in the routing table No ifs ands or buts I reached into my pocket and pulled out my

    Original URL path: http://www.routergod.com/mtu/mtu_1.html (2016-04-27)
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  • Jennifer Connolly on CCIE Lab Changes
    would no longer be IP Telephony in the RS lab why the change Sanjay Oh my yes where to start Oh so many problems We had many unexpected problems so we ahhh make change Jennifer Problems Can you elaborate Sanjay The test candidates were misusing the phones Jennifer Misusing the phones I don t understand Sanjay Oh where to start OK the candidates would often connect their phones to our IP phone system at Cisco and use the phones to make unauthorized calls Jennifer Very interesting what type of calls Sanjay At first they would do harmless things like order pizzas and call in to radio shows then they would progress to other things like calling Cisco support and opening help desk tickets to assist with their labs and sometimes they would page the proctors and get them to leave the room so they could compare notes Jennifer Very clever when did you first notice this Sanjay We discovered early on that the candidates would actually place calls to each other and we would see them whispering into the phones We also discovered many calls placed to India which indicates they were seeking tech support Some candidates would even operate

    Original URL path: http://www.routergod.com/jenniferconnolly/index.html (2016-04-27)
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  • Juliette Lewis On Troubleshooting  Frame Relay
    DSU CSU You want to start troubleshooting this connection then work you way outward You want to see up and up and the LMI type cause it has to match the type the Telco is using Also don t forget you wanna see frame relay as the encapsulation type not HDLC or something like that This command tells you about the physical layer The next thing I do is use the show frame relay lmi command LMI s are keep alives that are sent every 10 seconds by the phone company s frame switch They use DLCI 1023 and when you issue this command you will see the LMI count incrementing to indicate that the LMI s are being received Basically you enter the command a couple of times and hope the numbers get bigger Another thing that gets out of hand is frame relay mapping Mapping means relating a layer 3 address to a layer 2 address This means mapping an IP address to a DLCI number You can let inverse ARP do the mapping or you can do it manually using the frame relay interface dlci command but how would you actually check to make sure it is correct Use the show frame relay map command to verify this mapping The fourth and final show command is show frame relay pvc This tells you if the PVC is active what DLCI it s using and it will report on the number of BECNs and FECNs it has received Here is a summary of the 4 show commands we use to troubleshoot frame relay show interface show frame relay lmi show frame relay map show frame relay pvc The last words of each command can be arranged to spell L I M P That s L mi I nterface M ap and P vc Remember this you might be tested on it Picture the doctor asking to show him why you limp Now we will cover the various debugging commands that actually let you little buggers see what s being sent and received by the router in real time Warning Debugging a router can cause it to get so busy doing it s little debugging show that it will stop routing so be careful debugging production routers Tell your customer that their router may require a re boot that way you re covered in case you crash their core 7513 Or blame it on the phone company that works too The point is you might trash their network so before doing any work think up a plausible excuse If the guy who originally configured the router is not present start blaming him even before you look at the config I ll leave it to you but experienced technicians can just look at a router from across the room and start making slanderous accusations Ok just like there were 4 show commands we used there are 4 debug commands we use to troubleshoot frame relay The first is debug frame

    Original URL path: http://www.routergod.com/juliettelewis/index.html (2016-04-27)
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  • Paris Hilton on CCIE Storage
    a question no one was asking we decided to seek out a celebrity with the same attributes We selected mega skank Paris Hilton because like the CCIE Storage program she s here but nobody knows why Ladies and Gentlemen Paris Hilton Paris s empty head at perfect 22 5 angle Paris s vacuous head assumes a perfect 45 angle Paris is able to dangle her nonsensical noggin at an astonishing 38 angle RouterGod Magazine Welcome Miss Hilton thank you for agreeing to explain the new CCIE Storage program to us First off what is storage networking all about Paris Hilton Storage networking is a patchwork quilt of protocols and technologies that do many things including speeding up disaster recovery and improving perfomance RouterGod Magazine Wow you re smarter than you look A lot smarter No kidding Anyway give us an example of these protocols you speak of Paris Hilton Well iSCSI FCIP and FICON for example RouterGod Magazine FICON What on earth is that Paris Hilton FICON stand for Fiber Connection it s a method of transferring full duplex data over fiber with distances up 20 kilometers Storage Networks use it to move data between storage devices RouterGod Magazine What s on the written test Paris Hilton You can expect the usual Router management stuff then some Fibre Channel there will also be some TCPIP followed by more Fibre Channel Questions about storage networks and more Fibre Channel there s questions regarding management and oh yeah more Fibre Channel RouterGod Magazine What s the lab like Paris Hilton Ok here s the Blueprint You can see there s plenty of switching and QoS as well as security RouterGod Magazine Who would be a candidate for CCIE Storage Paris Hilton The CCIE Storage has such a narrow appeal it s really

    Original URL path: http://www.routergod.com/parishilton/index.html (2016-04-27)
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  • Gillian Anderson On Switching Part 1
    t you Relax cutie you are talking advanced CCNP type concepts there I m just a CCNA but let me explain what I mean Cisco s philosophy about switches is do no harm All ports are by default in the same vlan vlan1 to be exact So you can plug in the switch and plug in the cables and now every port is in a separate collision domain Michael Many of our viewers are still fixated on your picture at the top of the page can you explain about collisions domains for their benefit Gillian Not a problem Michael I get that all the time Switches work at layer 2 of the OSI model They listen on each port and write down the source MAC address of every Ethernet frame they hear This is put in what Cisco calls a CAM table it s a listing of every port and what machines can be found on each port These ports are not connected to one another The switch can connect them when it wants to but otherwise they are not connected Michael Nobody ever put it like that so the switch is just a series of ports that are not normally connected under what circumstances does the switch connect all the ports Gillian Connect all the ports You would have to be more specific is there any multicasting going on Are there different vlans Michael No you know what I mean why would the switch decide to connect 2 ports together Gillian Now that s a different question you said all ports at first Let me start from the beginning We re only talking one vlan right now Remember the switch pretty much knows what machines are on what ports it s been listening and creating these entries in the CAM table So it receives a frame coming in on port number 1 It looks at the frame and reads the MAC address of the destination and checks it s CAM table to see if it has already heard that machine on another port if it has it will forward that frame out the port that the destination machine resides on No other ports will hear this transmission On a single switch in a single vlan you could have a machine on port 3 sending a file to a machine on port 21 a machine on port 17 sending email to a machine on port 9 a machine on port 11 logging in to a server located on port 16 all at the same time If you tried to do that with a hub you would have collisions as only one data stream could travel the Ethernet at one time Michael Excellent In your example the switch has tripled the available bandwidth What if the switch looks in the CAM table but there is no entry listing the MAC address of the destination machine Does the switch just drop the packet Gillian Listen up cutie You just said packet A

    Original URL path: http://www.routergod.com/gilliananderson/index.html (2016-04-27)
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  • Nightmare on Tasman Street
    I felt After I spent 400 hours doing complex labs I was a total wreak My Lab date was only a week away I spent those last days tying up loose ends saying goodbye to my friends and family I packed my bags and started driving to San Jose Cisco Systems Once I arrived a met the other CCIE candidates There was a nervous silence as we waited for the Lab proctors It was very eerie I noticed that the floor was earthen and the receptionist would occasionally look over at us and shake her head as if to say you are so dead After an uncomfortable 20 minutes the Lab supervisor arrived to escort us into the lab CCIE 666 We followed the Lab supervisor through a serpentine maze of tunnels passageways and rickety staircases He was dragging one leg and as we followed we would mimic his leg dragging in an effort to bring some levity to this grim occasion It seemed we were lost but soon our leader opened a large oak door and we entered the Lab itself I was awestruck at it s simplicity I had expected a large room filled with routers and switches but we were in a dungeon of sorts The room was filled with many devices seeming medieval in nature there were stocks racks and even a bed of nails Every CCIE candidate must endure his own torture my torture was that I was to be forced to watch the announcement of Cisco s acquisition of Procket Networks Oh my God Not Procket I should have spent less time studying AS Path filtering and more time studying Cisco takeovers it was truly brutal Cisco just swooped in paid 89 Million for the company and lined up Procket s entire inventory of

    Original URL path: http://www.routergod.com/ccielab/index.html (2016-04-27)
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  • Gillian Anderson On LAN Switching Part 2
    d get you going Tell us about STP Let s hear the gory details Gillian OK you asked for it Right off the bat a switch is really a group of bridges that are wired up in a star pattern Every port on a switch is a bridge and every behind every port they are wired together So you can say switch port or bridge but you are talking about the same thing Spanning tree is a bridging protocol and as such is applied to individual ports on a switch Irfan Do switches use STP to talk to other switches Gillian Don t think switch the switch is a box that houses the bridge ports It s the bridge ports that use Spanning Tree to talk to other bridge ports When Spanning Tree is running on your switch what is going on behind the scenes is that every active port on your switch is sending out little packets called Bridge Protocol Data Units or BDPUs Sometimes BDPUs are called hello messages These BDPUs are beaconed out every 2 seconds by default When you introduce a port into a spanning tree environment it listens for these BDPUs to learn about the spanning tree topology Irfan How is the topology created by spanning tree Gillian The entire topology must resemble a tree to work properly and avoid loops A tree has small branches that flow downward into larger branches to a common single root If you have your switches wired together that contains multiple paths or that is meshy spanning tree will run what s called the Spanning Tree Algorithm and choose which ports offer the best path to the root of the tree Those ports which spanning tree selects as the way out of the local network will be put in a forwarding state and the other non optimal ports will be put in a blocking state Irfan Is there a central SPT server that does this calculation then tells all the ports in the enterprise what state to become Gillian No as long as each switch is using the same version of spanning tree IEEE for example they all know the rules and can read the BDPUs and determin which ports are blocked and which ports can forward Irfan What other states are there that a port can be in Gillian Well at first when a port comes up it goes int the Listening State It listens for BDPUs and by examing the contents of the BDPUs and figures out the topology of the existing network After the listening state the port may decide that it should go into a Blocking State In the blocking state no data can pass through the port but it is still examining BDPUs The port remains in the Listening State for however long a duration is specified by the Forward Delay Timer The Forward Delay Timer is set to 15 seconds by default Irfan So it could take a port up to 15 seconds

    Original URL path: http://www.routergod.com/gilliananderson/part2.html (2016-04-27)
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