Don’t Use ULA Addresses in Service Provider Core

Dan sent me the following question: I had another read of the ‘ Building IPv6 Service Provider Networks ’ material and can see the PE router...

Deutsche Telekom TeraStream: Designed for Simplicity

Almost a year ago rumors started circulating about a Deutsche Telekom pilot network utilizing some crazy new optic technology . In spring I’...

MPLS/VPN Carrier’s Carrier – Myth or Reality?

Andrew is struggling with MPLS/VPN providers and sent me the following question: Is "carriers carrier" a real service? I'm hav...

Juniper MX Routers – all you ever wanted to know

During a recent ExpertExpress engagement I got an interesting question: “ could we do per-customer policing and shaping on an MX-80 if we w...

The best of RIPE65

Last week I had the privilege of attending RIPE65, meeting a bunch of extremely bright SP engineers, and listening to a few fantastic presen...

IPv6 over PPPoE works great with IOS XE 3.7

Beatrice Ghorra ( @beebux ) was kind enough to share the results of her IPv6-over-PPPoE tests with me. Short summary: everything works as ...

The Difference between Metro Ethernet and Stretched Data Center Subnets

Every time I rant about large-scale bridging and stretched L2 subnets , someone inevitably points out that Carrier (or Metro) Ethernet work...

Do we need DHCPv6 Relay Redundancy?

Instead of drinking beer and lab-testing vodka during the PLNOG party I enjoyed DHCPv6 discussions with Tomasz Mrugalski, the “master-of-las...

Prefix-Independent Convergence (PIC): Fixing the FIB bottleneck

Did you rush to try OSPF Loop Free Alternate on a Cisco 7200 after reading my LFA blog post ... and disappointedly discovered that it only ...