Monthly Archives: October 2013

Frames are Fat, Packets are Tall

Sometimes odd things catch my attention. One thing that occurred to me is that packets are typically represented vertically, while frames are diagrammed horizontally. So if anyone ever asks about the differences between a frame and packet, you now have … Continue reading

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Introducing HSRP

A typical challenge that needs to be addressed in the access layer is that of providing a redundant default gateway. This is typically accomplished with something known as a First Hop Resolution Protocol, or FHRP. A common, but proprietary FHRP is the Hot Standby Router … Continue reading

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CML (aka VIRL)–Coming Soon to a VM Near You

According to to our friend Ivan PepeInjak, the Cisco product formerly known as VIRL (Virtual Internet Routing Lab) will be shipping sometime this Winter. The new name for the product that has teased us since Cisco Live US 2013 is … Continue reading

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Combining GRE and IPSec with a Front Side VRF

The article last week focused on the process of taking a typical GRE configuration and reconfiguring it so the transport network was in a separate VRF. This type of VRF is called a FVRF or front-end vrf. While this provides … Continue reading

Posted in How-To | Tagged | 8 Comments

Using a GRE Tunnel VRF to Separate the Physical Interface

Whether we like it our not, production networks often have particular use cases that require the implementation of tunnels. This may be an effort to extend a dynamic routing protocol across a service provider segment or an effort to overcome … Continue reading

Posted in Design | Tagged | 11 Comments

TTI Content, Now Online at Packet Pushers

In an effort get content in front of a broader community, all content from The Tech Interview is being relocated. The new home is the “work life” category of the Packet Pusher’s site. This is a first class blog site … Continue reading

Posted in Career | 1 Comment