Eric Stewart: Running Off At The Mouth

Lessons in Troubleshooting: IPv6, OSPF, and Strange Packet Loss

by on Jul.24, 2015, under Networking, Technology

Attempting (in my scatterbrained manner) to cover all the bases of an interesting issue I encountered recently and failed to fix without assistance. It illustrates why I’m not a CCIE yet, and why, no matter what you see, you shouldn’t assume anything when working through odd issues.

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Nexus 7700 Part VII: TCAM Woes and Solutions, Part 2

by on Jul.24, 2015, under Networking, Technology

A revisit to an earlier post and why what I outlined there was a bad idea. Using Bank Chaining, while allowing you to use more banks for ACLs, has its penalties …

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Eureka Moment: auto-summary on RIPv2 – What It Does

by on Jun.30, 2015, under Networking, Technology

Two things covered in this post: what I learned about how “auto-summary” on RIPv2 works, and also some particulars about RIPv2 (and possibly other routing protocols) and how it advertises routes to neighbors.

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Cisco Live 2015

by on Jun.12, 2015, under Networking, Technology

Cisco Live 2015. Yeah, there are things I can say about it that are negative. But even with all that, it was, for me, the best so far. Here’s my review and a few pictures …

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CCIE Studies: IS-IS Lab Notes

by on Mar.22, 2015, under Networking, Technology

Just a couple of notes for myself that Google didn’t make as clear as it should have for me.

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CCIE Studies: OSPF E1 vs E2 For Dummies

by on Mar.14, 2015, under Networking, Technology

Restating what I’ve pulled from other sources, and clarifying that there actually is a difference. It’s commonly said that “E2 routes will not include path cost,” but that’s an oversimplification of the difference and a somewhat misleading statement, because, in some cases, path cost is considered. Here’s the scoop.

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Nexus 7700 Part VI: vPC Part II: You Can’t Use The Peer-Link For Everything

by on Feb.21, 2015, under Networking, Technology

$JOB doesn’t have as much of a testing environment as one might like to have, so sometimes you discover issues during implementation that, once you resolve them, you can’t go back and pick apart. An issue with the vPC Peer link appears to have prevented one of our 7710’s going into our data center from properly forming an OSPF adjacency with the DR.

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Nexus 7700 Part V: TCAM Woes and Solutions

by on Jan.21, 2015, under Networking, Technology

I get an error message while pasting in some VLAN interfaces:

ERROR: Module 1, 2, 10 returned status: Tcam will be over used, please enable bank chaining and/or turn off atomic update.If bank-chaining is enabled on other modules and this is a new linecard insertion,please enable bank-chaining prior to reloading this module.

Well, this (I think) is what it means, and how I resolved the situation.

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Nexus 7700 Part IV: vPC – Basic Configurations and Annoyances

by on Jan.08, 2015, under Networking, Technology

Having been silent about my Cisco Nexus 7700 work for a while, I come across something that irked me a little bit while trying to configure our 7700 pair to replace the 6500s, involving Virtual Port Channels. So here’s what Virtual Port Channels are and how they basically work, as well as one or two things that you might want to be aware of. So, this may end up getting quite long …

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A Day With the iMac: Photo Syncing

by on Nov.29, 2014, under Computers, Technology

So we’ve had some computers die and were in need of something for a specific purpose: something to sync and backup our iOS devices with. Seeing as how we were originally using Windows for that, you’d think we’d have just gotten a cheap Dell or something. But, no. After some discussion, we got a refurbished iMac from Apple. Given that we were used to how Windows worked, this may have not been the best idea … even for someone who otherwise likes Macs, like me.

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