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Found 4 results

  1. Introduction - I've been out of it for a while now, 1.5 years or so by now. So I'm starting fairly fresh. I started last night by setting up some gear - 19 4500/4700 Routers to be my MPLS/Service Provider Core and edge - also serves as a nice foundation for the troubleshooting section of the CCIE RS Labs. I've got a literal army of 1700/2500/2600/3640 Routers to service my Troubleshooting Sections - various configurations - this is another 60+ routers in total. I have to count them but I know I have 30+ 2600 XM/Non-XM's, almost 20 or so 1700's, and at least a dozen 3640's so that is literally enough for mostly anything. The location I'm using is power-full - over 400amps of power and ample cooling. The idea is to use 3 VoIP Routers for my Voice Lab, and then 3 more routers as the remaining routers for the primary CCIE RS Lab. L2 Routers - 2950's connect the RS Routers, Security, SP, VoIP, WLAN, SAN, and CCDP/E, racks of gear together - to the backbone itself. This may sound overly complex but hey... it just is. It's my skillsets and I've CCNP/CCDP level in all of the above skillsets and so I have my reasons - I'm also a practicing Enterprise-Level Network Architect/Engineer/Manager so... It works for me. I have a slew of Firewalls, IPS/IDS, Load Balances, WLAN Gear, Authentication, Network Management/Analysis, Domain and Workstations of various types to do as I please for my little network. I know its overkill and Mark will be the first to remind me. It's what's on my plate and this is how it is going to work. I cannot afford to constantly rebuild/re-design the lab so I'm doing it up front and in a scalable manner. I'll supply some pictures as I go and of course will answer any questions as best I can and if they are practical I can lab them up on this gear. I said some pictures - I meant a lot of pictures - this is meant to be a practical and very visual journey. I've purchased mostly every work book by now and I have access to every book there is in print - so I can work with mostly anyone on any problem as I go. My primary goal is experience and expertise and of course if I'm doing all this correctly a CCIE or two may come of it eventually. No rush for me. I already command a CCIE Plus's salary and benefits and am bombarded daily by so many offers it is nothing less than incredible - so I don't have the need to rush it or need a vendor to validate what I don't know yet. Anyone reading what I'm writing can make that distinction clearly enough. So I guess this is sort of my own little onlineportfolio of what my own capabilities are and are not. I do have to take the exam and I am due to re-take the CCIE RS Written again and it will renew several of my lower-level certifications at the same time. I have to admit that I get books and perform book reviews for Cisco Press so I may sideline publicly to demonstrate some labs or concepts I find interesting along the way. As of now: 1. I stacked some 4500/4700 routers. 2. I started reading the old Chesapeake class on BGP from the 1990's. After I complete my refresher reading, I'll take on the labs included in this course. OSPF is the next course from the same training course of the period and I'll be working on it next. Sounds old but I like them and they work for me. Anyone intersted is welcome to follow along. I'll probably use Visio and Adobe PDF's to illustrate the lab scenarios I am working on for a more visual representation of my work. Expect a lot of output from the Routers in each lab. Might be boring to some people. Maybe not to everyone. This is all just to warm up for more things to come.
  2. OSPF Mindmaps for your studies. Cram and Memorize the concepts for your exams http://www.cybertribune.net/2014/08/ospf-mindmaps.html
  3. OSPF is an interior gateway protocol that routes Internet Protocol (IP) packets solely within a single routing domain (autonomous system). It gathers link state information from available routers and constructs a topology map of the network. The topology determines the routing table presented to the Internet Layer which makes routing decisions based solely on the destination IP address found in IP packets. OSPF was designed to support variable-length subnet masking (VLSM) or Classless Inter-Domain Routing (CIDR) addressing models. OSPF detects changes in the topology, such as link failures, very quickly and converges on a new loop-free routing structure within seconds. It computes the shortest path tree for each route using a method based on Dijkstra’s algorithm, a shortest path first algorithm. The OSPF dynamic routing protocol is probably the most popular LAN routing protocol today. OSPF can scale to the largest LANs but can also start out small. While OSPF can be complex to configure, its basic configuration isn’t difficult. How to configure OSPF in the Cisco IOS? Do the steps as follows What do You Need to Know about OSPF? Before you configure OSPF, there are three things you should know about it first. Here they are: OSPF stands for open shortest path first. It also uses the SPF (shortest path first) algorithm to determine the best route to its neighbors. OSPF is a standard routing protocol, as defined by RFC2328 and RFC1247. This means that OSPF can run on just about any company’s’ routers and OSPF routes from a non-Cisco router can be exchanged with Cisco routers. The administrative distance for OSPF is 110. The entire network that OSPF routes for is called an “Autonomous System”, or “AS”. All OSPF routing updates must traverse area 0. Because of this, you should carefully design your network before you begin deploying OSPF. With OSPF, every router has its own unique “picture” (topology map) of the network. Routers use “HELLO” packets to periodically check with routers to ensure they are still there. Every router in OSPF is identified with a “router ID”. The router ID can be manually entered or OSPF will automatically choose the IP address with the highest number. What Features does OSPF Offer? OSPF offers the following features that are found in a number of routing protocols: A standards-based routing protocol that works is very interoperable between different vendors routers and firewalls Supports variable length subnet masks (VLSM), making it a classless routing protocols Authentication of routing updates are supported Route redistribution is supported between different routing protocols OSPF works well in point to point and point to multipoint, broadcast or non-broadcast configurations OSPF also offers a number of OSPF-specific features such as stub areas, virtual links, and OSPF on demand circuits. How do You Configure OSPF in the Cisco IOS? To configure OSPF in the Cisco IOS, just follow these steps: Set the bandwidth on your interfaces using the bandwidth command Router (config-if)#bandwidth XX (where XX signifies the bandwidth of the WAN connection) Start the OSPF routing process and specify your process number. The process number is an arbitrary number. It is recommended that the number match on all routers but it is not required. The process ID number does not have to be the AS number, although many people confuse that it is. Router (config)# router ospf {process-ID#} Next, instruct the router to advertise the networks that are directly linked to it by entering network statments with the area ID number for that network, like this: Router (config-router)# network {X.X.X.X} {Y.Y.Y.Y} area {z} In this example, the X.X.X.X is the network id of a network that is linked directly to the router. The Y.Y.Y.Y is the wildcard mask for that network. The wildcard mask is the inverse mask of the subnet mask. The “z” parameter is the area id number. For small networks, this can always be zero (0) but for larger networks, the area IDs need to be properly planned as all routing updates must traverse area 0. You should enter a network statement for every network directly attached to the router. Once OSPF is configured, you can check the status using the show ip route and show ip ospf commands. For more information on configuring OSPF, see the official Cisco OSPF documentation.
  4. hello! why r2 not make adjacency relationship with r1?