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Author Archives: Keyboard Banger

DTP modes on Cisco Catalyst Switches

default-mode-on-2960

Cisco recommends to set trunking as static. But here is the behaviour if we don’t set it to “switchport mode trunk”. For Catalyst 2960 and Catalyst 3560, I found that the default DTP mode is “dynamic auto”. Key behaviours: Dynamic ... Read More »

How to Use Virtual PC Simulator in GNS3

topology

One or more PCs are needed to test some features, like VLANs, HSRP,… To make this possible with GNS3, I use what is called Virtual PC Simulator, or VPCS. Download Virtual PC Simulator You can download Virtual PC Simulator for free on the ... Read More »

BGP Traceoptions on Juniper Routers

a-clear-bgp-neighbor-is-issued-on-another-router

#set protocols bgp traceoptions file bgp #set protocols bgp traceptions flag update detail #set protocols bgp traceptions flag keepalive detail #set protocols bgp traceptions flag open detailNow in normal operation, we should only see keepalives: Then I issued a clear ... Read More »

CJNR Ended.

All I can say is that 5 days aren’t enough. Juniper should reconsider the necessary time for the CJNR course. There are lots of knowledge to cover. Labs take a considerable amount of time if you want to assimilate the ... Read More »

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