Eric Stewart: Running Off At The Mouth

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.

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 …

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.

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 …

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

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.

$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.

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.

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 …

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.