Blog Posts in 2012

December 2012

• Webinars in 2012 (31 Dec 2012)
• That’s it for 2012 (17 Dec 2012)
• Hyper-V Network Virtualization (HNV/NVGRE): Simply Amazing (14 Dec 2012)
• Do We Need FHRP (HSRP or VRRP) For IPv6? (13 Dec 2012)
• Change in OSPF Designated Router Creates Extra Network LSAs (10 Dec 2012)
• Who the **** needs 16 uplinks? Welcome to 10GE world! (06 Dec 2012)
• Large Leaf-and-Spine Fabrics with Dell Force10 Switches Using 10GE Uplinks (05 Dec 2012)
• Secondary MPLS-TE Tunnels and Fast Reroute (04 Dec 2012)
• IPv6 Prefixes Longer Than /64 Might Be Harmful (03 Dec 2012)

November 2012

• VXLAN Gateways (30 Nov 2012)
• Stackable Data Center Switches? Do the Math! (29 Nov 2012)
• IPv6 On-Link Determination (27 Nov 2012)
• EIGRP Loop Prevention Logic (23 Nov 2012)
• Reconnaissance in IPv6 (22 Nov 2012)
• IPv6 Router Advertisements Deep Dive (21 Nov 2012)
• VXLAN Is Not a Data Center Interconnect Technology (19 Nov 2012)
• Building Leaf-and-Spine Fabrics with Dell Force10 Switches (16 Nov 2012)
• IPv6 deployment IETF drafts (15 Nov 2012)
• What Exactly Are Virtual Firewalls? (14 Nov 2012)
• BGP Convergence Optimization (13 Nov 2012)
• More real-life DHCPv6 Prefix Delegation gotchas (12 Nov 2012)
• Virtual Firewall Taxonomy (09 Nov 2012)
• DHCPv6 Prefix Delegation, RADIUS and Shared Usernames (07 Nov 2012)
• IPv6 Trilogy (06 Nov 2012)
• Firewalls in a Small Private Cloud (05 Nov 2012)
• IP packet delivery confirmation (02 Nov 2012)

October 2012

• Setting NO-EXPORT BGP Community (31 Oct 2012)
• IPv6 RADIUS Accounting (30 Oct 2012)
• Coping with Holiday Traffic – Secondary DHCP Subnets (29 Oct 2012)
• VM-level IP Multicast over VXLAN (25 Oct 2012)
• Beware of the Pre-Bestpath Cost Extended BGP Community (24 Oct 2012)
• The Best of Last Week’s IPv6 Summit (23 Oct 2012)
• Skip the Transitions, Build IPv6-Only Data Centers (22 Oct 2012)
• Is Layer-3 DCI Safe? (16 Oct 2012)
• IPv6 First-Hop Security: Ideal OpenFlow Use Case (15 Oct 2012)
• If Something Can Fail, It Will (12 Oct 2012)
• Dear $Vendor, NETCONF != SDN (10 Oct 2012)
• Disabling IP unreachables breaks pMTUd (09 Oct 2012)
• Don’t use IPv6 RA on server LANs (05 Oct 2012)
• Updated webinar roadmaps (04 Oct 2012)
• You MUST Take Control of IPv6 in Your Network (03 Oct 2012)
• The best of RIPE65 (02 Oct 2012)

September 2012

• SDN Controller Northbound API Is the Crucial Missing Piece (27 Sep 2012)
• SDN, Career Choices and Magic Graphs (25 Sep 2012)
• Cisco Nexus 3548: A Victory for Custom ASICs? (20 Sep 2012)
• Arista launches the first hardware VXLAN termination device (19 Sep 2012)
• Best of July 2012 (18 Sep 2012)
• Building Large L3 Fabrics with Brocade VDX Switches (12 Sep 2012)
• Why is OpenFlow focused on L2-4? (10 Sep 2012)
• Do we need LACP and UDLD? (06 Sep 2012)
• QFabric Behind the Curtain: I was spot-on (04 Sep 2012)
• Dear VMware, BPDU Filter != BPDU Guard (03 Sep 2012)

August 2012

• Midokura’s MidoNet: a Layer 2-4 virtual network solution (30 Aug 2012)
• Is Layer-3 Switch More than a Router? (28 Aug 2012)
• VXLAN and OTV: I’ve been suckered (27 Aug 2012)
• Layer-2 DCI and the infinite wisdom of acmqueue (25 Aug 2012)
• 802.1BR – same old, same old (23 Aug 2012)
• PVLAN, VXLAN and Cloud Application Architectures (21 Aug 2012)
• IPv6 over PPPoE works great with IOS XE 3.7 (20 Aug 2012)
• Mobile ARP in Enterprise Networks (16 Aug 2012)
• Do you really need to prove how clever you are? (15 Aug 2012)
• Why is RESTful API better than SNMP? (14 Aug 2012)
• OpenFlow and Ipsilon: Nothing New Under the Sun (13 Aug 2012)
• IRS – just what the SDN Goldilocks is looking for? (10 Aug 2012)
• Do You Need IPsec to Run IPv6? (09 Aug 2012)
• The state of TRILL (07 Aug 2012)
• DMCA Works (06 Aug 2012)
• EIGRP: an MBA-Like Perspective (03 Aug 2012)
• OpenStack/Quantum SDN-based virtual networks with Floodlight (02 Aug 2012)
• Multitasking Explained (01 Aug 2012)

July 2012

• Is It Safe to Run Internet in a VRF? (31 Jul 2012)
• Virtualized Squashed Complexity Sausage (29 Jul 2012)
• VMware buys Nicira: a Hypervisor Vendor Woke Up (25 Jul 2012)
• The Difference between Metro Ethernet and Stretched Data Center Subnets (24 Jul 2012)
• The future of SDN (22 Jul 2012)
• BGP Route Replication in MPLS/VPN PE-routers (19 Jul 2012)
• Long-Distance Workload Mobility in Perspective (17 Jul 2012)
• Analyst-driven IPv6 deployment (16 Jul 2012)
• Can I download the webinar recordings? (13 Jul 2012)
• Ever wondered what the latest hype is all about? (13 Jul 2012)
• Why Do Internet Exchanges Need Layer-2? (12 Jul 2012)
• Does CPU-based forwarding performance matter for SDN? (10 Jul 2012)
• Legacy Protocols in OpenFlow-Based Networks (04 Jul 2012)
• Just what you need: Positive Factors in Childhood Development (03 Jul 2012)
• Could MPLS-over-IP replace VXLAN or NVGRE? (03 Jul 2012)

June 2012

• We need both OpenFlow and NETCONF (28 Jun 2012)
• NETCONF = Expect on steroids (26 Jun 2012)
• Does TRILL make sense at all? (21 Jun 2012)
• BGP operations and security, second draft (20 Jun 2012)
• Hybrid OpenFlow, the Brocade Way (19 Jun 2012)
• Cisco ONE: More than just OpenFlow/SDN (15 Jun 2012)
• Big Switch and Overlay Networks (14 Jun 2012)
• QFabric Lite (12 Jun 2012)
• OpenFlow/SDN is not a silver bullet (07 Jun 2012)
• Choose your networking equipment with RIPE-554 (05 Jun 2012)

May 2012

• Equal-Cost Multipath in Brocade’s VCS Fabric (31 May 2012)
• ARP reply with multicast sender MAC address is indeed illegal (30 May 2012)
• Layer-2 Network Is a Single Failure Domain (28 May 2012)
• Move it to the cloud (25 May 2012)
• Brocade: Yet Another SDN Strategy (24 May 2012)
• IPv6-only Data Center (built by Tore Anderson) (23 May 2012)
• Goodbye Echo, I’ll miss you! (22 May 2012)
• HTTP-over-IPv6 on Cisco IOS (21 May 2012)
• OpenFlow @ Google: Brilliant, but not revolutionary (18 May 2012)
• Are Fixed Switches More Efficient Than Chassis Ones? (16 May 2012)
• Virtual Networks: the Skype Analogy (14 May 2012)
• Transparent Bridging (aka L2 Switching) Scalability Issues (11 May 2012)
• Brocade VCS Fabric (10 May 2012)
• NHRP Rate Limiting Can Hurt Your DMVPN Network (09 May 2012)
• Does Optimal L3 Forwarding Matter in Data Centers? (07 May 2012)

April 2012

• Best of March 2012 (26 Apr 2012)
• STP loops strike again (24 Apr 2012)
• Interesting OpenFlow links (2012-04-21) (21 Apr 2012)
• Virtual Networking is more than VMs and VLAN duct tape (19 Apr 2012)
• Best of February 2012 (18 Apr 2012)
• LineRate Proxy: Software L4-7 Appliance With a Twist (17 Apr 2012)
• Full Mesh Is the Worst Possible Fabric Architecture (16 Apr 2012)
• vCider: A Hammer Looking For a Nail? (12 Apr 2012)
• Beware of fabric-wide Link Aggregation Groups (11 Apr 2012)
• Monkey Design Still Doesn’t Work Well (10 Apr 2012)
• IPv6 Static Addresses and Renumbering (04 Apr 2012)
• Networking Tech Field Day #3: First Impressions (03 Apr 2012)
• IPv6 Legends and Myths: More Opinions than Data Points (02 Apr 2012)

March 2012

• Cisco & VMware: Merging the Virtual and Physical NICs (30 Mar 2012)
• Cloud Services Taxonomy (29 Mar 2012)
• Migrating from Phase 1 DMVPN to Phase 2/3 Network (28 Mar 2012)
• Stretched Layer-2 Subnets – The Server Engineer Perspective (27 Mar 2012)
• Looking into Data Center Storage Protocols mysteries (26 Mar 2012)
• Video: Networking requirements for VM mobility (22 Mar 2012)
• Scalable, Virtualized, Automated Data Center (21 Mar 2012)
• MPLS/VPN in the Data Center? Maybe not in the hypervisors (19 Mar 2012)
• Do we really need Stateless Transport Tunneling (STT) (16 Mar 2012)
• VXLAN and EVB questions (15 Mar 2012)
• Knowledge and Complexity (14 Mar 2012)
• Designing Scalable Web Applications: Introduction (13 Mar 2012)
• Grumpy Monday: HP and OpenFlow (12 Mar 2012)
• OpenFlow: A perfect tool to build SMB data center (08 Mar 2012)
• Do we need DHCPv6 Relay Redundancy? (07 Mar 2012)
• Don’t forget to secure the IPv6 management plane (06 Mar 2012)
• All EuroNOG presentations are available online (05 Mar 2012)
• My first Internet Draft has just been published (02 Mar 2012)
• Anyone Can Get IPv6 PI Space – Buy More RAM and TCAM? (01 Mar 2012)

February 2012

• See you @ PLNOG in Warsaw (29 Feb 2012)
• Does CCIE still make sense? (28 Feb 2012)
• Edge Virtual Bridging (802.1Qbg) – a Technology Refusing to Die (27 Feb 2012)
• Embrace the Change ... Resistance Is Futile ;) (24 Feb 2012)
• Updated Webinar Roadmaps (23 Feb 2012)
• NEC+IBM: Enterprise OpenFlow you can actually touch (22 Feb 2012)
• 6WIND: Solving the Virtual Appliance Performance Issues (20 Feb 2012)
• IBM launched a Nexus 1000V competitor (17 Feb 2012)
• Visiting the Ivory Tower (16 Feb 2012)
• Microsoft Network Load Balancing Behind the Scenes (15 Feb 2012)
• Bandwidth-On-Demand: Is OpenFlow the Silver Bullet? (14 Feb 2012)
• Buying yearly subscription a bit at a time (13 Feb 2012)
• Nicira, BigSwitch, NEC, OpenFlow and SDN (10 Feb 2012)
• Nicira Open vSwitch Inside vSphere/ESX (09 Feb 2012)
• Cloudy thoughts (08 Feb 2012)
• Nicira uncloaked (06 Feb 2012)
• Virtual Circuits in OpenFlow 1.0 World (03 Feb 2012)
• Easy Virtual Network (EVN) – nothing new under the sun (02 Feb 2012)
• Forwarding State Abstraction with Tunneling and Labeling (01 Feb 2012)

January 2012

• FIB Update Challenges in OpenFlow Networks (31 Jan 2012)
• Prefix-Independent Convergence (PIC): Fixing the FIB Bottleneck (27 Jan 2012)
• Loop-Free Alternate: OSPF Meets EIGRP (26 Jan 2012)
• VXLAN runs over UDP – does it matter? (25 Jan 2012)
• Redundant DMVPN Designs, Part 2 (Multiple Uplinks) (24 Jan 2012)
• DHCPv6 Prefix Delegation with Radius Works in IOS Release 15.1 (21 Jan 2012)
• IP Renumbering in Disaster Avoidance Data Center Designs (20 Jan 2012)
• IPv6 ND Managed-Config-Flag Is Just a Hint (19 Jan 2012)
• Redundant DMVPN designs, Part 1 (The Basics) (17 Jan 2012)
• Filter Inbound BGP Prefixes: Summary (16 Jan 2012)
• How could we filter extraneous BGP prefixes? (12 Jan 2012)
• BGP-Free Service Provider Core in Pictures (11 Jan 2012)
• Can We Really Ignore Spaghetti and Horseshoes? (10 Jan 2012)
• Should I Use 6PE or Native IPv6 Transport? (05 Jan 2012)
• Prevent bridging loops without BPDUs? (04 Jan 2012)
• Are Provider-Independent IPv6 Prefixes Really Global? (03 Jan 2012)