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DMVPN
In this post we'll take a look at DMVPN from a perspective of what I suspect will be on the CCIE R&S v5 blueprint. Admittedly I'm taking guesses as all Cisco has released is "single hub DMVPN", but...
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Everything BFD
I sat down to start working on BFD three weeks ago thinking I'd be done in a couple of days. Three weeks later I'm finally starting blogging on it. To be fair, I missed a week to drinking heavily in...
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IPv6 First Hop Security
IPv6 First Hop Security is a new topic for CCIE v5. It's important to note that at the time of this writing (June/July 2014), IPv6 FH Security is not supported in IOL, so this cannot be on the...
View ArticleVTP v3
VTP v3 isn't technically a "new addition" to the CCIE lab, but code versions prohibited it from being used up until recently. I've been told IOL does in fact support VTP v3, so it should be considered...
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BGP PIC and Add-Path
The meat of this article will be Add-Path, and why it's needed in certain PIC scenarios. However, understanding where and why we need these technologies, what was done before the Add-Path...
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EIGRP Enhancements
Cisco did a major overhaul of EIGRP in recent IOS. These can be loosely looked at as new features in "EIGRP Named Mode". In reality, I suspect that the EIGRP teams were working on a series of new...
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OSPF LFA & Remote LFA
Continuing on the same track as my recent posts regarding EIGRP FRR and BGP PIC/Add-path, today I'm writing about OSPF LFA. OSPF FRR/LFA accomplishes the same concept as EIGRP FRR, but in a much more...
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CCIE v4 to v5 Updates: NTPv4 and Netflow
I didn't find these updates on any Cisco or 3rd party list, but when writing my original NTP and Netflow blogs in mid-2013, I mentioned out-of-scope topics when writing them, because they weren't...
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CCIE v4 to v5: BGP NHT, SAT, FSD, Dynamic Neighbors, Multisession Transport...
BGP Next Hop Tracking (NHT) is an on-by-default feature that notifies BGP to a change in routing for BGP prefix next-hops. This is important because previously this only happened as part of the BGP...
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[mini] Fail-Over Policy Based Routing
Playing with PBR recently I came across what I thought was an odd usage - two set commands in the same statement.i.e.route-map PBR permit 10 match ip address to-be-matched set ip next-hop 192.168.0.1...
View Article46110
Well folks, I am finally done. Two years, 11 months. Today, January 5th, 2015, I passed, on my 4th attempt - #46110.However, the blog will continue!My next step is CCNP Voice, and I plan on writing up...
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[mini] Static RP Address Blocks auto-RP Dense Flows
My first 40 posts were written while I was attempting to improve my understanding of a number of topics. At this point in my studying, I've moved on to practicing interoperability of features, so I...
View Article[mini] Why does LDP "require" a /32 Loopback?
A few days ago I asked a coworker why LDP sessions had issues if they weren't peered on /32s. He answered, it doesn't have to be a /32, but the IGP and LDP had to agree on the mask length. So I asked...
View Article[mini] Embarassing BGP as-override misunderstanding
It can be hard to post on the Internet about dramatically misunderstanding a technology. In my defense, I've never worked for an MPLS provider, so I've never used as-override outside of a lab -...
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[mini] PPPoE in the DocCD
I ran across a PPPoE problem a couple days ago, and let me tell you, this is not my favorite topic. I've only used it in production once, and I don't come across it in practice labs enough to keep it...
View Article[mini] BGP Auto-Summary
I recently got a task on a practice lab that was obviously regarding BGP auto summary. I'm well-practiced in BGP on production systems, but who the heck uses auto-summary any longer? It then occurred...
View Article[mini] VTY Rotary
I've always found it helps a great deal to have a use-case for a feature. There's thousands of features to learn and be at least somewhat familiar with when attempting the CCIE lab. Remembering them...
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[mini] OSPF Point-to-Multipoint .... Multicast?
I recently took a practice lab and got dinged for points on an OSPF area question. Without quoting the actual practice lab, the question was referencing a frame-relay link and said something akin to...
View ArticlePrivate VLANs - How they really work
You're probably already familiar with the basics of a private VLAN: it allows you to group hosts in a single subnet on Ethernet, but limit which hosts can talk to each other at layer 2. A common...
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The Woz!
Totally off topic this time - but tonight, I met Steve Wozniak, and it was amazing.He went to a small networking event that I attended. When I signed up for it, I was on the fence about attending - he...
View Article[mini] PIM Dense State Refresh
Been brushing up on multicast recently. It was one of the first topics I ever deep-dived and some of the material is rusty now... two and a half years later. Came across PIM-DM State Refresh. This is...
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MPLS EXP-based QoS and QoS Groups
This topic is a bit of a stretch for the R&S lab, really being more oriented towards Service Provider, but I wanted to talk about it anyway.So what does your MPLS carrier do with those QoS settings...
View ArticleA Thorough Approach for Debugging MPLS L3 VPNs
I recently realized I needed a more organized approach to debugging MPLS L3 VPNs for the troubleshooting section. Referencing a lot of the practice labs I've taken, I'm going to give a run-down of what...
View ArticleNew Material Coming Soon... honest!
Just shy of a year ago, I posted:"...the blog will continue! My next step is CCNP Voice, and I plan on writing up my findings here, as well as any interesting R&S topics I come across."Well, that...
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GETVPN
GETVPN, or Group Encrypted Transport VPN, is Cisco's implementation of the GDOI standard. GDOI, or Group Domain of Interpretation, is defined in RFC 6407, which obsoleted the original RFC, 3547.GDOI...
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