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Time-based ACLs

Time-based ACLs

Ever since Cisco released IOS 12.0.1T we’ve had the ability to broaden the reach of the extended ACL to allow the influence of time.

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Remote Configuration Tip

Remote Configuration Tip

I got asked a rather interested question the other day. An engineer needed to make remote configuration changes to a router, but do the commands he needed to run, he would be …

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IP Multicast Routing Concepts

IP Multicast Routing Concepts

Can you imagine a video conference taking place on a primarily T1 based WAN? Multiple copies of the same video stream being unicast from the host to each participant. Multiple …

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Public Service Announcement for Engineers

Public Service Announcement for Engineers

We all know how stressful our jobs can be. And we certainly know about our own hot button issues that press on the nerves in our brain, resulting in great pain and agony which in …

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SVI Autostate

SVI Autostate

Switch Virtual Interfaces, or SVIs on Cisco IOS use a feature called autostate to determine the interface availability. By default an SVI will show an up/down (Status / Protocol) …

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Nexus 1000v – Out of Ports on a Virtual Switch?

Nexus 1000v – Out of Ports on a Virtual Switch?

Yesterday, work presented an interesting issue I wanted to share with everyone. While configuring a new virtual machine one of our systems engineers was presented with an issue he …

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