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Troubleshooting

Becoming a CCIE – the path and cost associated to my number

While on IRC I had a request to describe my journey and the costs associated with becoming a CCIE. Becoming a CCIE is not cheap but I’ve worked for great companies that have covered all of my costs. I first

ddib November 2, 2012March 10, 2017 Announcement, CCIE 40 Comments Read more

MPLS troubleshooting scenario

I’m in final preparation for my second attempt and I have been doing a lot of troubleshooting scenarios lately. I created a MPLS topology in GNS3 and sent it to my friend Darren for testing. He is taking his lab

ddib April 23, 2012 CCIE, MPLS, Troubleshooting 19 Comments Read more

INE TS Vol4 – two labs done

Did some of these TS labs this week. They are very challenging but they are designed by Petr Lapukhov so they should be… I found these to be more difficult than the ASET TS labs. From what I’ve heard from

ddib August 18, 2011March 10, 2017 CCIE, Troubleshooting, Useful commands No Comments Read more

First troubleshooting session done

I did my first troubleshooting session tonight. I was worried about only having 2 hours alotted but time was the least of my concerns. I finished at 70 minutes so almost an hour to spare. I did quite OK, 60%

ddib May 5, 2011 CCIE 3 Comments Read more

Troubleshooting multicast – RPF failure

In unicast routing we are interested in how to forward packets to their destination. In multicast routing we are interested where the source came from, multicast packets need to pass a RPF (Reverse Path Forwarding) check. Packets that are received

ddib February 16, 2011 CCIE, Multicast, Troubleshooting 2 Comments Read more

BGP troubleshooting – route not installed

Sometimes prefixes in BGP do not get installed into the routing table, if the route is also in an IGP that might be a reason but then a RIB-failure would be indicated. This scenario shows another possible source of problems.

ddib February 12, 2011 BGP, CCIE, Troubleshooting No Comments Read more

BGP troubleshooting – peer address not matching

Yesterday I did some Internetwork Expert vol1 labs on BGP. I was having trouble getting some of the peers to come up and had to troubleshoot. This post will describe how to troubleshoot when peers won’t form. First, lets look

ddib February 8, 2011 BGP, CCIE, INE, Troubleshooting 2 Comments Read more

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