Eric Stewart: Running Off At The Mouth

Tag: cisco

“Breaking” Cisco Live 2017 News: Closing Guest Speaker!

by on May.09, 2017, under Networking, Technology

So – I’m going this year. Flight, hotel, classes all booked (just need to squeeze in possibly a CCNP TSHOOT exam and I’m all set). But I have some news hot off the presses: I know who’s going to be giving the closing keynote! And of course, some additional social gaming has been added to this year’s event.




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What Do You Call 28,000 Geeks In Las Vegas?

by on Jul.20, 2016, under Networking, Technology

A) A Week With Friends
B) Summer Camp

C) A Learning Experience

D) Cisco Live 2016

E) All Of The Above







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deny ip any any: What You Need On An “in” ACL For DHCP And HSRP To Work

by on Apr.28, 2016, under Networking, Technology

It’s been my experience that “ip access-group <acl> in” is rarely used. Most of the time, people look at the “out” form of the command. In this post, I will explain how to view the different directionality of the “in” vs “out” and then review the issues that you can encounter with respect to DHCP and HSRP when it comes to ending an “in” ACL with a “deny all” at the end.







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Optical Networking: Basics, DWDM, ROADM

by on Oct.26, 2015, under Internet Service Providers, Networking, Technology

$JOB is getting into some new and interesting stuff; stuff that, if you’re not an Internet Service Provider, could be a bit of a black box to you; you might be used to your ISP saying “Here’s a cable, your equipment is on the other end”. Here’s what we’ve been working on and what I’ve been able to make of it so far.







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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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