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Packet Life The Data Center Overlords Greyhole - Redundant Storage Pooling using Samba Cisco IOS Hints and Tricks: TRILL and 802.1aq are like apples and oranges A comment by Brad Hedlund has sent me studying the differences between TRILL and 802.1aq and one of the first articles I’ve stumbled upon was a nice overview which claimed that the protocols are very similar (as they both use IS-IS to select shortest path across the network). After studying whatever sparse information there is on 802.1aq (you might want to read Greg Ferro’s fascination with IEEE paywall) and the obligatory headache, I’ve figured out that the two proposals have completely different forwarding paradigms. To claim they’re similar is the same as saying DECnet phase V and MPLS Traffic Engineering are similar because they both use IS-IS. TRILL forwarding Within the backbone, TRILL is a true layer-3 protocol: TRILL header has a hop count, RBridges have layer-3 addresses and the layer-2 header changes as the packet is propagated across the backbone. 802.1aq forwarding The ingress PBB (Provider Backbone Bridge) takes the user’s MAC frame and encapsulates it in 802.1ah MAC frame.
Routing Protocols | GNS3 Labs :: Cisco Router Simulator Network Labs & Topologies GNS3 Lab & Exercise: OSPF Case Study & Lab Scenario 3 Written by LBSources from on August 13th, 2010 | 27 Comments How are we doing? GNS3 Lab & Exercise: GNS3-Labs – BGP & EIGRP Case Study 4 Written by LBSources from on July 6th, 2010 | 25 Comments Hello All! GNS3 Lab & Exercise: EIGRP & OSPF Route Manipulation Written by LBSources from on June 26th, 2010 | 7 Comments So here is another lab I put together based on some studies and reading recently. GNS3 Lab & Exercise: OSPF Case Study & Lab Scenario 2 Written by LBSources from on June 19th, 2010 | 3 Comments How are we doing? GNS3 Lab & Exercise: EIGRP & OSPF Case Study – Lab Scenario Written by LBSources from on June 12th, 2010 | 4 Comments Alright – Moving on and getting into some lab scenarios. GNS3-Lab & Exercise – BGP Route Reflectors & Filters Keeping it going with BGP here! GNS3-Topology: CCIE Mock Lab
GNS3 | Graphical Network Simulator wiki:vpcs [Who Is Wiki] The VPCS can simulate up to 9 PCs. You can ping/traceroute them, or ping/traceroute the other hosts/routers from the virtual PCs when you study the Cisco routers in the Dynamips. VPCS is not the traditional PC, it is just a program running on the Linux or Windows, and only few network commands can be used in it. But VPCS can give you a big hand when you study the Cisco devices in the Dynamips. Try VPCS, it can save your CPU/Memory. Now, VPCS can be run in udp or ether mode. Download The latest version 0.21a , download from sourceforge , or download here has been tested under CentOS64/Ubuntu64/OSX/WindowsXP/Windows7. Usage vpcs [options] -u udp mode, default -e tap mode, using /dev/tapx -s port local udp port, default from 20000 -c port remote udp port(dynamips udp ports), default from 30000 -r file run startup file If in the ether mode, please run it before the dynamips loads/starts the ios. .net file (ether mode), please refer to dynagen for details. .bat (udp mode) .net file (udp mode) Note
Route Views Project Page Internetworking Technology Handbook From DocWiki Creating a PDF of the Internetworking Technology Handbook Create a PDF of the Internetworking Technology Handbook that you can save on your computer and print. Internetworking Basics An internetwork is a collection of individual networks, connected by intermediate networking devices, that functions as a single large network. The following articles provide information about internetworking basics: LAN Technologies A LAN is a high-speed data network that covers a relatively small geographic area. The following articles provide information different LAN technologies: WAN Technologies A WAN is a data communications network that covers a relatively broad geographic area and that often uses transmission facilities provided by common carriers, such as telephone companies. The following articles provide information about the various protocols and technologies used in WAN environments: Internet Protocols The following articles provide information about different IOS IP technologies: Routing