Layer 2


Useful Articles

  • Ethernet getting back on the Moore's Law track.  [Russ White]  [TheNextPlatform]
  • Two decades of VLANs.  [The Register]
  • To jumbo or  not to jumbo?  [ipSpace]
  • PCIe versus Ethernet in a composable system.  [Russ White]
  • Why do you learn Frame Relay and PPP today?  [Packet Pushers]
  • Farewell to 40Gbps Ethernet.  [The Register]
  • More affordable 10GBase-T switches imminent.  [HardOCP]  [AnandTech]
  • Making the leap to 25GE and beyond.  [Network Computing]
  • 2.5 and 5 Gigabit Ethernet: benefits and use cases.  [Network Computing]
  • Do not buy 40GE Ethernet -- it's obsolete.  [Packet Pushers]
  • Open networking options grow.  [Network Computing]
  • ARP - detailed analysis.  [Packet Pushers]
  • Facebook debuts 'Backpack' switch platform.  [Network Computing]  [Facebook Blog]  [The Register]  [Russ White]  [MarketWatch]
  • 100G+ data center evolution and challenges.  [NANOG 68 YouTube]
  • 25 - 50 - 100 Gigabit Ethernet options and experiences in the data center.  [NANOG 68 YouTube]
  • Facebook's 100GE Wedge switch makes strides.  [Network Computing]  [Networking Nerd]
  • 25 Gigabit Ethernet rollout.  [Network Computing]
  • Replacing FabricPath with VXLAN, EVPN or ACI?  [ipSpace]
  • VPLS:  [ipCisco]
  • Label switched multicast - Ethernet header.  [Packet Mischief]
  • Layer 2 routing -- haven't we been here before?  [Russ White]
  • Link aggregation terminology explained.  [Network Computing]
  • Three drivers for 25GE adoption.  [Network Computing]
  • 10 ways to get the most out of Ethernet.  [Network Computing]
  • Leaving fixed function switches behind.  [Russ White]  [TheNextPlatform]
  • Metro optical networks at the heart of Internet Exchanges.  [DC Knowledge]
  • Construction zones on the Ethernet roadmap.  [Russ White]  [TheNextPlatform]
  • LACP is not Link Aggregation.  [DC Overlords]
  • Neighbor discovery protocols:  [ipCisco]
    • Part 1: Neighbor discovery protocols
    • Part 2LLDP - Link Layer Discovery Protocol
    • Part 3: CDP - Cisco Discovery Protocol
    • Part 4CDP config with packet tracer
    • Part 5: LLDP-MED
    • Part 6: LLDP Cisco config
  • Spanning Tree woes.  [ipSpace]
  • STP and bridging loops.  [ipSpace]
  • Ethernet picks up the pace.  [EE Times]
  • VLANs and failure domains revisited.  [ipSpace]
  • 25GE data center deployment scenarios.  [Network Computing]
  • Dark fibre: embracing the dark side.  [Network Computing]
  • Providing timing synchronization in Ethernet raises many issues.  [EE Times]
  • Three trends driving the 100G Ethernet market.  [DC Knowledge]
  • STP on virtual switches.  [ipSpace]
  • Link utilisation by packet size.  [Network Sherpa]
  • SPAN scaling challenge.  [Network Sherpa]
  • Ethernet checksums are not good enough for storage.  [ipSpace]
  • Building a 40G MACsec FPGA IP core.  [EE Times]
  • How RSTP handles topology changes.  [Aspiring Networker]
  • Choosing paths to future Ethernet speeds.  [GazettaByte]
  • Skipping 10GE and going direct to 25GE?  [EtherealMind]
  • Stretched VLANs make little sense.  [ipSpace]  [Andrew Lerner]
  • When a port channel member link goes down.  [Packet Mischief]
  • Another spectacular Layer 2 failure.  [ipSpace]
  • The stupidness of switch programming.  [ipSpace]
  • A guide to the terminology of open switching.  [NetworkWorld]
  • What is Layer 2 and why do we need it?  [ipSpace]
    • More Layer 2 misconceptions.  [ipSpace]
  • Let's get rid of the thick yellow cable.  [ipSpace]  [Mark Burgess]
  • Who cares about FCoE in 2015?  [EtherealMind]
  • Differences in how Fibre Channel and Ethernet measure speed.  [DC Overlords]
  • STP notes for CCDE.  [Lost In Transit]
  • Multigigabit Ethernet 2.5 / 5.0Gbps NBASE-T Alliance.  [IPEngineer]
  • DHCP snooping -- filter those broadcasts.  [MellowD]
  • Move aside twisted-pair Ethernet, it’s time for WiFi to take the network reins.  [ExtremeTech]
  • Micro-BFD: BFD over LAG.  [ipSpace]
  • Last chance at chassis switch saloon.  [EtherealMind]
  • LAG vs ECMP.  [ipSpace]
  • RSTP basics -- can this be done?  [StackExchange]
  • How long is a frame really supposed to be, and when is a frame a babble?  [StackExchange]
  • STP and expert beginners.  [ipSpace]
  • Is STP really evil?  [ipSpace]
  • Explanation: TunnelX temporarily disabled due to recursive routing.  [PacketU]
  • Potential issues with multicast within a VLAN spanning switches.  [Lost in Transit]
  • SPAN destination ports and VLAN membership.  [Aspiring Networker]
  • Ethernet, STP, topology change and the behaviour of Ethernet.  [Lost in Transit]
  • Facebook reveals open network gear.  [The Register]  [GigaOM]
  • Switch prices will get cheaper - design models will change.  [EtherealMind]
  • What does everyone replace their 6500s with?  [Reddit]
  • Understanding tunnel path MTU discovery.  [PacketU]
  • When a VLAN is not a VLAN.  [Mellowd]
  • Take your network to 40/100G Ethernet.  [DC Knowledge]
  • Use of the Ethertype in a frame.  [Reddit]
  • Can MSTP (802.1s) be used to emulate Rapid-PVST?  [StackExchange]
  • Understanding Cisco FabricPath.  [DustyDev]
    • PDF attached below: Cisco FabricPath.pdf
  • Using carrier-delay with BFD on the same interface.  [StackExchange]
  • Admin VLAN best practices.  [Reddit]
  • Cisco Nexus 5000 VTP trunk status in vPC consistency parameter.  [StackExchange]
  • Spine and leaf architecture and security/services.  [Reddit]
  • The evolution of the Ethernet switch.  [Network Computing]
  • STP design considerations: MSTP and regions.  [StackExchange]
  • Catalyst 2960x vs Juniper EX4200.  [Reddit]
  • Will 2014 be the year of 10GE?  [Network Computing]
  • Visual guide to LAG thinking for server admins.  [EtherealMind]
  • Authentication mac-move permit.  [StackExchange]
  • Voice VLAN information.  [StackExchange]
  • RSPAN and 802.1q tags limitation.  [NExp]
  • Why can't we find Ethernet checksum in Wireshark?  [StackExchange]
  • Monitoring without port mirroring.  [StackExchange]
  • 'interface vlanX' or 'interface loopbackX'.  [StackExchange]
  • Mixing Cisco STP Features: BPDU Guard, BPDU Filter, PortFast and PortFast Trunk.  [StackExchange]
  • Cloud Ethernet Forum -- because Ethernet needs to look like Frame Relay.  [EtherealMind]
  • What is the actual size of an Ethernet MTU.  [StackExchange]
  • Detecting different Ethernet frames.  [StackExchange]
  • Switch lookup table.  [StackExchange]
  • IEEE 400Gbps Ethernet study group.  [EtherealMind]  [IEEE]
  • Combining GRE and IPSec with a Front Side VRF.  [PacketU]
  • What to use as ARP request Target Hardware Address?  [StackExchange]
  • Something is filling my force10 ARP table.  [StackExchange]
  • Map the underlying structure of a VLAN.  [StackExchange]
  • Tracking down an invalid source mac address.  [StackExchange]
  • Extending Layer-2 connection into a cloud.  [ipSpace]
  • How was the MTU size for ethernet frames calculated as 1500 bytes?  [StackExchange]
  • Five tips to save a bundle on switches.  [Network Computing]
  • Picking the right switch: a buyer's decision tree.  [Network Computing]
  • Ethernet autonegotiation differences between (10M | 100M | 1G) Ethernet.  [StackExchange]
  • Cisco Catalyst 3750/3560 SYN FLOOD protection.  [StackExchange]
  • In what mode does the 2960-S IOS prompt ends with a colon “:”.  [Stack Exchange]
  • In 802.1Q Tunneling what exactly is meant by “a point-to-point topology before you enable tunneling for PAgP, LACP, or UDLD”?  [StackExchange]
  • Carrier's VLAN tags overlap my own.  [StackExchange]
  • What happens when the ARP cache overflows?  [StackExchange]
  • Implement layer 2 DMZ with VLAN translation.  [StackExchange]
  • How to monitor VLAN traffic?  [StackExchange]
  • Trying to test a virtual lab VRRP configuration for STP issues.  [StackExchange]
  • How can I make a PVST+ switch root towards MST network?  [StackExchange]
  • Is ATM still used as a transport protocol?  [StackExchange]
  • Can adding VLANs to a vPC be done hot?  [StackExchange]
  • Two SSIDs for same VLAN -- problems?  [StackExchange]
  • About the switchport mode.  [StackExchange]
  • NX-OS peer-switch issues with 6500 VSS.  [StackExchange]
  • How can I capture traffic on Cisco IOS switches?  [StackExchange]
  • A quick fix for a bad switch port.  [Network Sherpa]
  • Are there any reasons not to use BFD?  [StackExchange]
  • VM BPDU spoofing attack works quite nicely in HA clusters.  [ipSpace]
  • VLANs are the wrong abstraction for virtual networking.  [ipSpace]
  • What did you do to get rid of manual VLAN provisioning?  [ipSpace]
    • Where is my VLAN provisioning application?  [ipSpace]
  • Ethernet at 40: its daddy reveals its turbulent youth.  [The Register]
  • Tech notes: what is shortest path bridging IEEE 802.1aq?  [EtherealMind]
  • What's happening inside an Ethernet switch?  [EtherealMind]
  • Ethernet sales fizzle, but self-aware networks set to explode.  [The Register]
  • On the premature death of STP.  [Network Janitor]
  • Who needs 16 uplinks?  Welcome to the 10GE world!  [ipSpace]
  • Intel: high quality built-in PHYs simplify ToR switch designs.  [EtherealMind]  [Intel]
  • 10GBaseT -- still improving in invisible ways.  [EtherealMind]
  • Do we need LACP and UDLD?  [ipSpace]
  • Simultaneous tunneled and native Internet access.  [PacketLife]
  • Dear VMware, BPDU filter != BPDU guard.  [ipSpace]
  • Midokura's MidoNet: a layer 2-4 virtual network solution.  [ipSpace]
  • IEEE begins work on 400Gbps and 1Tbps Ethernet.  [ExtremeTech]  [cNet]  [Hexus]
    • Network boffins say Terabit Ethernet is too fast.  [The Register]
  • Mobile ARP in enterprise networks.  [ipSpace]
  • The difference between metro Ethernet and stretched data center subnets.  [ipSpace]
  • Why do IXPs need layer 2?  [ipSpace]
  • Basics: what's the difference between STP BPDU Guard and Root Guard?  [EtherealMind]
  • 11 things about using a transparent or layer 2 firewall.  [EtherealMind]
  • ARP reply with multicast source MAC is indeed illegal.  [ipSpace]  [RFC1812]
  • Layer 2 network is a single failure domain.  [ipSpace]
  • Transparent bridging (aka L2 switching) scalability issues.  [ipSpace]
  • STP loops strike again.  [ipSpace]
  • Full mesh is the worst possible fabric architecture.  [ipSpace]
  • vCider: a hammer looking for a nail?  [ipSpace]
  • Basics: Cisco VLAN Trunking Protocol -- transparent discard and passing VTP packets.  [EtherealMind]
  • Beware of fabric-wide link aggregation groups.  [ipSpace]
  • Monkey design still doesn't work well.  [ipSpace]
  • Infiniband over Ethernet is better than Ethernet, says VMware.  [EtherealMind]
  • Stretched layer 2 subnets -- the server engineer perspective.  [ipSpace]
  • Using FC, FCoE or iSCSCI when deploying new gear in existing data center.  [ipSpace]
  • Do we really need Stateless Transport Tunneling (STT)?  [ipSpace]
  • EVB -- Edge Virtual Bridging (802.1Qbg) -- A technology refusing to die.  [ipSpace]
  • GRE vs IPIP tunneling.  [PacketLife]
  • Ethernet standards for hyper-scale cloud networking.  [The Register]
  • Preventing bridging loops without BPDUs?  [ipSpace]
  • Can fibre optic Ethernet cables be longer than the standard?  [EtherealMind]
  • Large-scale L2 DCI: a true story.  [ipSpace]
  • FCoE and LAG -- industry-wide violation of FC-BB-5.  [ipSpace]
  • Decouple virtual networking from the physical world.  [ipSpace]
  • Ethernet jumbo frames, full duplex and why jumbo frames are 9000 bytes.  [EtherealMind]
  • VMware vSwitch -- the baseline of simplicity.  [ipSpace]
  • Ethernet reaches for the hyper-scale cloud.  [The Register]
  • Virtual switches need BPDU guard.  [IOS Hints]
  • You can't sell multi-hop FCoE even though it's a consultant's dream.  [EtherealMind]
  • Busting layer-2 data center interconnect myths.  [IOS Hints]
    • When discussing stretched clusters...  [ipSpace]
  • Why Gigamon scares the crap out of me.  [Evil Routers]
  • L2 or L3 switching in campus networks?  [IOS Hints]
  • Generic VLAN design.  [IOS Hints]
  • Should I use BFD in my network?  [EtherealMind]
  • Can network architectures break the speed limit?  [The Register]
  • CloudSwitch -- VLAN extensions done right.  [IOS Hints]
  • Source MAC address spoofing DoS attack.  [IOS Hints]
  • Stop reinventing the wheel and look around.  [IOS Hints]
  • The Ethernet traffic mix-up.  [EtherealMind]  [The Register]
  • Speed matters: how Ethernet went from 3Mbps to 100Gbps... and beyond.  [Ars Technica]
  • Network evolution and the hierarchy of needs.  [EtherealMind]
  • All MTUs are not the same.  [IOS Hints]
  • Do we really want 100Gig Ethernet?  [The Register]
  • The beauties of dense-mode FCoE.  [IOS Hints]
  • Blast from the past: ATM and PoS interfaces.  [IOS Hints]
  • Stretched clusters: almost as good as heptagonal wheels.  [IOS Hints]
  • EVB -- 802.1QBG -- the S component.  [IOS Hints]
  • Ignoring STP?  Be careful, be very careful.  [IOS Hints]
  • Edge Virtual Bridging (EVB, 802.1QBG) eases VLAN configuration pains.  [IOS Hints]
  • Fate sharing, failure domains and why VTP is awesome.  [EtherealMind]
  • Explaining L2 multipath in terms of north/south, east/west bandwidth.  [EtherealMind]
  • Does bridge assurance make UDLD obsolete?  [IOS Hints]
  • Fault detection in metro Ethernet.  [EtherealMind]
  • Diverging Ethernet switch markets.  [EtherealMind]
  • Local Area Mobility (LAM) -- the true story.  [IOS Hints]
  • Spanning tree, three states and why committees suck.  [EtherealMind]
  • Layer-3 gurus asleep at the wheel.  [IOS Hints]  [Network Janitor]
  • Hybrid access layer design revisited.  [PacketLife]
  • A VLAN hopping attack.  [CCIE Blog]
  • Backplane Ethernet -- the GBaseK standard.  [EtherealMind]
  • All the Ethernet cooks.  [Etherealmind]
  • Bidirectional forwarding detection (BFD).  [CCIE Blog]
  • Ethernet IFG -- another living fossil?  [IOS Hints]
  • Multi-chassis link aggregation basics.  [IOS Hints]
  • Introduction to 802.1Qbb.  [IOS Hints]
  • DHCP snooping and dynamic ARP inspection.  [PacketLife]
  • Bridging and routing: is there a difference?  [IOS Hints: part 1part 2]
  • Bridges: a kludge that shouldn't exist.  [IOS Hints]
  • IEEE 802.1Q tunnelling.  [PacketLife]
  • The basics of ATM.  [MPLS VPN]
  • InfiniBand to outpace Ethernet's unstoppable force.  [The Register]
  • Interconnecting two core switches.  [IOS Hints]  [Packet Attack]
  • Blocking unknown unicast flooding.  [PacketLife]
  • Port security.  [PacketLife]
  • Multiple Spanning Tree (MST).  [PacketLife]
  • How well do you know VTP?  [CCIE Blog]
  • Locating a host port by IP address.  [PacketLife]
  • The invisible Catalyst switch.  [PacketLife]
  • Understanding STP and RSTP convergence.  [CCIE Blog]
  • Understanding MSTP.  [CCIE Blog]
  • Unnumbered Ethernet VLAN interfaces.  [NIL Wiki]

VXLAN

  • Extending Layer 2.  [Network Collective, YouTube]
  • VXLAN ping and traceroute.  [ipSpace]  [ipSpace stream]
  • Why do we need VXLAN -- and what it is?  [ipSpace, video]
  • VXLAN gateway hardware overview.  [ipSpace]
  • VXLAN has no security!  [ipSpace]
  • Routing over VXLAN.  [ipSpace, video]
  • VXLAN on VMware NSX: VTEP, proxy, Unicast/Multicast/Hybrid mode.  [Route Reflector]
  • Cisco adds Ethernet VXLAN BGP support to Nexus switches  [The Register]
  • Revisited: Layer 2 DCI over VXLAN.  [ipSpace]
  • VXLAN encapsulation in Juniper Contrail.  [ipSpace]
  • Layer 3 switching over VXLAN revisited.  [ipSpace]
  • vMotion and VXLAN.  [ipSpace]
  • Using VXLAN to speed & secure your clouds.  [DC Knowledge]
  • VXLAN scalability challenges.  [ipSpace]
  • VXLAN gateway design guidelines.  [ipSpace]
  • VMware's SDN dilemma: VXLAN or Nicira?  [Brad Hedlund]
  • Long-distance vMotion, stretched HA clusters, and business needs.  [ipSpace]
  • VXLAN gateways.  [ipSpace]
  • VXLAN is not a data center interconnect technology.  [ipSpace]
  • A better fabric with VMware NSXi for your network switch.  [Brad Hedlund]
  • VM-level IP multicast over VXLAN.  [ipSpace]
  • VXLAN and OTV: I've been suckered.  [ipSpace]
  • Could MPLS-over-IP replace VXLAN or NVGRE?  [ipSpace]
  • VXLAN and EVB questions.  [ipSpace]
  • VXLAN runs over UDP -- does it matter?  [ipSpace]
  • VXLAN, IP multicast, OpenFlow and control planes.  [ipSpace]
  • The first open vSwitch VXLAN patch is in.  [Network Heresy]
  • VXLAN termination on physical devices.  [IOS Hints]
  • NVGRE, VXLAN and what Microsoft is doing right.  [Network Heresy]  [IOS Hints]
  • Top five things about VXLAN -- and why it's full of fail.  [EtherealMind]

Trill

  • Why is TRILL not routing at layer 2?  [IOS Hints]
  • Setting the stage for TRILL, rethinking data center switching.  [Brad Hedlund]
  • Trill/fabric path -- STP integration.  [IOS Hints]
  • Rant: why SPB doesn't get any attention.  [Etherealmind]
  • On "Why TRILL won't work for the data center".  [Brad Hedlund]
  • DCB and TRILL have nothing in common.  [IOS Hints]
  • TRILL goes to WAN -- the bridging craze continues.  [IOS Hints]
  • Does TRILL make sense at all?  [ipSpace]
  • The state of TRILL.  [ipSpace]

MC-LAG

Ċ
Robert Larsen,
13 Apr 2014, 13:55