Posts from ‘CCIE 4.0’
Troubleshooting tips for MPLS
Last week we wrapped up the MPLS bootcamp, and it was a blast! A big shout out to all the students who attended, as well as to many of the INE staff who stopped by (you know who you are 
). Thank you all.
Here is the topology we used for the class, as we built the network, step by step.
The class was organized and delivered in 30 specific lessons. Here is the “overview” slide from class: Continue Reading
Time is a valuable resource in the lab. In a lab task, if asked to configure a policy-map named “BOB”, it doesn’t get the same point value if we happen to accidentally name it “bob”, especially if they are looking to see if you configured what they asked for.
The challenge is, that when reviewing a lab task, and we discover that we need to change a name, it could be a hassle, as we need to remove the policy-map, recreate the policy map, and then put it in place again.
So if you are down to the last minute, here is a time saving solution, that can assist with that process.
IOS allows us to rename a policy-map, and the IOS will swap out the name in other areas of the configuration that reference that policy map. Continue Reading
Can you solve this puzzle?
R2, R3 and R4 create the service provider network, with MPLS on all three routers, and iBGP at the PE routers. R1 and R5 are the CE routers.
R2, prefers the BGP next hop of 4.4.4.4 for network 5.5.5.5 (R5 loopback). R4, at 4.4.4.4 is an iBGP neighbor.
R2#show ip route vrf v | inc 5.5.5.0 B 5.5.5.0 [200/409600] via 4.4.4.4, 00:06:47
Is R2 preferring an iBGP learned route, which has an AD of 200, over a EIGRP route, which would have an AD of 90?
Can you identify why the routing for 5.5.5.0 on the VRF of R2 is using BGP instead of EIGRP?
Below are the relevant portions of the configuration, which also can serve as a great review of how to configure MPLS VPNs. Continue Reading
Are you ready to explore the following?
- HSRP
- VRRP
- GLBP
- NTP
- DHCP
- DNS
- WCCP
Check out the latest chapter posted in the Advanced Technologies Class On Demand.
Next week watch for the final chapter on Network Optimization, where we explore such critical Version 4 topics like EEM, IP SLA, and much more.
Also, soon here on the blog site, watch for a Video Blog episode that discusses study and lab exam strategy for the massive body of knowledge that is IP Services/Optimization in general.
The new version of the best-selling video series, Advanced Technologies Class on Demand (ATCoD) from INE has been updated with Chapters 8 and 9. These topics are Security and QoS respectively.
The final two chapters of the new course, Network Services and Network Optimization, are currently in production and will be posted no later than July 31, 2010.
Enjoy the new lessons everyone!
“Why doesn’t this PING work!?!”
Here is a simple 3 router configuration, well at least it is simple on 2 of the 3 routers. R1 and R3 are configured quite traditionally, but R2 is a bit more involved.
Here is the diagram.
Here are the details.
R2 is using a VRF which includes both LAN interfaces. R2 is also acting as a Zone Based Firewall in transparent mode, allowing all ICMP traffic in both directions, as well as SSH from the inside to the outside networks. R2 has a bridged virtual interface in the 10.123.0.0/24 network. All are running OSPF, but pings issued from R2 to the loopbacks of R1 and R3 are failing.
Can you identify why? Continue Reading
Tags: ccie, troubleshooting
Summer was in full swing, and it was over 105 degrees Fahrenheit outside. Bob was told it was a “dry heat”, but he thought “so is my oven”. Needless to say, Bob was glad to be in the data center, where the temperature and humidity controls kept it very cold. He had been asked to setup up a basic route-map with BGP, and here is the diagram he worked from.
The goal, was to modify BGP, so that all traffic going towards the 1.1.1.0 network (which is sourced from AS1), traveling either from or through AS23, would only use the 13.0.0.0/24 segment (between R3 and R1), and not use the 10.0.0.0/24 segment (between R2 and R1) as a transit path.
Bob reviewed some of the BGP topics he had recently learned. Here is the list he made of possibilities: Continue Reading
Join us Friday, June 25th at 11AM Pacific / 2PM Eastern for another installment in the Open Lecture Series.
The topic that will be covered is Privilege Levels and Role Based CLI.
We look forward to seeing you there. Seats are limited.
- The QoS 5-Day Bootcamp is going to be quite a crowd! I look forward to catching up with old friends in that class. REMINDER: The Live Event starts at 11 AM EST each day beginning Monday, June 7th, 2010. Do not stress if you have to miss chunks of the Live Event due to your other life. Remember, you receive the class in recorded, interactive, and audio formats as well. Should you have questions during the recorded content, just email me directly. All versions will be ready for you the week following the Live Event.
- A quick shout out to the crew in the 2010 Summer Chicago 6 Day R&S bootcamp. Nice to see all of the Cisco employees in class, and thanks for not starting a brawl with the HP folks across the hall!
- Keith Barker and I just uploaded a new and important lesson in the Volume 2 Interactive Video Companion product. It is an interactive lesson on Troubleshooting. Troubleshooting what you might ask? Everyone’s favorite topic – Redistribution!!!!! Enjoy.
- More full labs walkthroughs are on the way for the Video Companion…we are waiting for an incredibly exciting re-release of Volume 2 that is happening very soon. Bug fixes, better explanations and verifications, and a full blown 2-hour Troubleshooting section in each lab. Wow!
- I re-sat the CCIE Written exam last week and I am adding practice exam questions still to Practice Exam 2 in the Written bootcamp. Many of the new Cisco questions were really pretty good and most of the good ones involved none other than Troubleshooting. Sure some questions are not so great and test trivia, but they were not of such a volume that they should be failing us, in my humble opinion.
- Thanks for reading my friends, and remember, Tech Knowledge, Strategy, Psychology, and Physical Wellness are your keys to success in these challenging Lab Exams. More and more students are asking me about study strategies and I will be sure to blog more on that soon.
It isn’t my fault, they configured it that way before I got here! That was the entry level technician’s story Monday morning, and he was sticking to it.
Here is the rest of the story. Over the weekend, some testing had been done regarding a proposed BGP configuration. The objective was simple, R1 and R3 needed to ping each others loobacks at 1.1.1.1 and 3.3.3.3 respectively, with those 2 networks, being carried by BGP. R2 is performing NAT. The topology diagram looks like this:
The ping between loopbacks didn’t work, but R1 and R3 had these console messages:
R1# %TCP-6-BADAUTH: No MD5 digest from 10.0.0.3(179) to 10.0.0.1(28556) (RST) Continue Reading
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