Cisco Switching Notes

Thu, 09 Feb 2012 21:31:13 +0200

a 3750 can act as a layer3 switch by adding the “ip routing” command.
It can automatically route between locally created vlans because it considers them as connected interfaces (given that the SVIs are created).
on a device, there are 3 types of traffic: control, management, end user.
Control traffic such as CDP, DTP, PAgP goes through vlan1 between Cisco switches, even if you clear it from trunks.
By default, native vlan traffic is untagged. But there’s a Cisco command that tells the switch to tag all vlans.
by default, native vlan = vlan1. If we set the native vlan to vlan100, then vlan100 frames will be untagged on trunks, and vlan1 frames will be tagged.
SMI: Standard Multilayer Image
EMI: Enhanced Multilayer Image
if switch is acting L2, then we should set a Default Gateway on it to make the management vlan reachable remote ; if it is acting L3, it will have routes instead.
switch and Management vlan
the management IP address must be reachable from remote
best practice: use a same subnet to manage all network devices
on L2 SW: only one SVI is up at a time

Cisco BSCI Exam

Fri, 27 Feb 2009 21:31:13 +0200

Score is 822. Passing score was 790. It came after four days of reviewing IPv6, Route maps, BGP,… In the beginning of the test I was taking enough time to read and answer the questions. However I lost much time in my first lab simulation. The scenarion wasn’t clear to me. And each time I had to click on the console button to reach a router. And I was not seeing changes in the routing table so it confused me a lot. I began to worry about my score. And I got my second lab simulation. And immediately after, the third. I told to myself: “man, what did I do to Cisco to treat me this way?” So I had almost 38 minutes to do the third lab sim and 32 questions ! Besides, the test supervisor was tearing papers on her desk. And the other guy in the room was complaining about the bug in his exam. I was going to scream. At the end, I was almost flipping through the questions. I finished the test. The test supervisor told me “congratulations!”.

Certification on

Cisco Switching Notes

Cisco BSCI Exam