Archive for April, 2010
Probably one of the most confusing topics for people studying BGP/MPLS VPNs are EIGRP SoO and Cost communities. Not the concepts themselves, but rather their purpose. Lack of clear documentation makes it hard to understand why and how the specific features are implemented. In this blog post we discuss the BGP Cost community and EIGRP SoO attribute. First, a brief overview of MP-BGP is given along with general concepts of route redistribution in MPLS/BGP VPNs. Next, the problems that arise when using EIGRP in multihomed VPN environment are demonstrated. Lastly, the two specific EIGRP features are described and their use demonstrated. As usual, a reader is assumed to have basic understanding of fundamental L3 VPNs and PE-CE routing concepts. You may download the post in PDF format at the following link: Understanding EIGRP SoO and BGP Cost Community
Is it possible to recommend the Cisco press books to read when preparing for the Cisco SP Written exam.
For the written exam, you should make sure you have reviewed the items in the online resources General, Metro Ethernet, and Service Provider sections for the Written Exam Blueprint preparation material.
Here ye, here ye, VTP experts. (We are not referring to the Vandenberg Test Program, although they are very likely experts in their field as well. )
Can you predict the results of a 3 switch VTP client/server scenario?
SW1-3, are connected, as shown in the diagram.
Here is the initial output of show VTP status, and show VLAN brief on each. Note that SW1 and SW3 are servers, while SW2 is a client. We will be adding a failure to the network in just a moment. Continue Reading
INE is excited to announce the next free vSeminars for R&S. vSeminars are live online instructor-led seminars focused around a specific topic or technology. The next Routing & Switching vSeminar will be held on Wednesday, April 21, 2010 at 3:00 PM PDT.
We will be lecturing on the IPv6 Multicast. This vSeminar is scheduled for 60 minutes, with a 45 minute seminar followed by a 15 minute question and answer session. This seminar is intended for CCIE Routing & Switching candidates. If you would like to prepare for this vSeminar, you can find more information on IPv6 Multicast in the CCIE Routing & Switching Workbook Volume 1.
While there is no registration required to attend, the live vSeminar will be limited to 50 participants on a first come first serve basis.
Wednesday, April 21 at 3:00 PM PDT this vSeminar will be live here.
Fans of the wildly popular CCIE Written Bootcamp need to check out Practice Exam 2 which has been updated with some more thought-provoking Quality of Service (QoS) questions that will help with the CCIE R&S Written as well as the Lab exam.
For some fun for all, try this question on for size:
Match the QoS marking with the correct definition:
1. DSCP EF
2. DSCP 20
3. IP PREC 5
6. EXP BITS
b.Diff Serv VoIP
c. Frame Relay
e.Legacy VoIP Marking
f. Assured Forwarding 22
The answer is posted in the comments. Enjoy.
Thank you for all the great feedback on the vSeminars. We have released the following vSeminars as free videos on demand.
- Recorded April 12, 2010
- Recorded April 14, 2010
- Topic: “Secrets” to Version 4 Routing & Switching Success
- Target Audience: CCIE Routing & Switching Candidates
- Duration: 1 Hour
- Recording: Watch Now
- Recorded April 16, 2010
Thank you to all those who have submitted questions and comments to our blog. We will be taking time each week to post answers to your questions and to post some of these comments. If you have a question for one of our CCIE Instructors please email them to firstname.lastname@example.org.
Can anyone please advise what is the recommended laptop hardware configuration for CCIE R&S Lab prep. I have read many blogs, posts and advices but unable to figure out the appropriate answer. While advising,please consider the GNS3 is the only option I have.
Many thanks in advance,
Sometimes its the simple things that are struggled with. RIP is one of those. Most CCIE candidates understand that we can change the interface or global parameters for updates, unicast, multicast, etc. What does take some time, is figuring out the global timers, especially if a person is not sure how they interact.
In this post, we will address the RIP process level timers for update, invalid, hold down and flush. I don’t want you to sleep during this, so we will save that one for later.
Timers Basic, all in seconds:
Update: how often to send updates in seconds
Invalid: how many seconds, since seeing a valid update, to consider the route invalid, and placing the route into hold down
Hold Down: Once in hold down, how long (in seconds) to “not believe” any equal or less impressive (worse) route updates for routes that are in hold down
Flush: how many seconds, since the last valid update, until we throw that route in the trash (garbage collection for un-loved non-updated routes)
Here is our topology. Keep your attention on R2, and that will be the focal point for this lesson.
Let’s set up some unique values, so we can see the results.
We had a great response in turnout to Josh’s vSeminar yesterday. Thanks to everyone who made it out, we certainly hope it was beneficial for you!
A few comments from attendees in the ET helped us realize that the next Voice vSeminar, this Friday covering Simplifying Globalization and Localization, might be best held at 4pET/1pPT, rather than the 6pET/3pPT that it was originally scheduled for. So we changed it.
So why a lecture on this topic? Well, every class that I have taught over the last few months has invariably had most students walking in with a printout of the 40+ page, 3-part series on Globalization, Localization, and Mapping the Global to Local Variant blogs that I posted here on this blog a bit back. They all seem to have the same thing to say: “Excellent post, now can you simplify it just a bit for me and can you also explain why we would want to do any of this?”. So to that end – I decided to take on the task of helping you understand not only how in a much simpler way, but possibly more importantly, the why of it all. Continue Reading
INE is excited to announce the return of the popular free vSeminars for R&S. vSeminars are live one hour online instructor-led seminars focused around a specific topic or technology. The first of our Routing & Switching vSeminars will be held on Wednesday, April 14, 2010 at 3:00 PM PST. We will be lecturing on the “Secrets” to Version 4 Routing & Switching Success. This 45 minute seminar will be followed by a 10 minute question and answer session. While there is no registration required to attend, the live vSeminar will be limited to 50 participants on a first come first serve basis. If you miss the live seminar you will be able to watch it again, on-demand, at http://www.ine.com/free-ccie-vseminar.htm.
Bookmark the vSeminar page now: http://www.ine.com/free-ccie-vseminar.htm.