CCIE Pursuit Blog

October 29, 2008

Internetwork Expert: Big Announcement Coming Tomorrow

Filed under: Cisco,Cisco Certification — cciepursuit @ 11:35 am
Tags: , , , ,

Internetwork Expert hinted last week at a big announcement last week.  It looks like the big announcement will drop this Thursday:

Brian Dennis and Brian McGahan, Co-Founders of Internetwork Expert, will make a major corporate announcement during an online webcast, Thursday, October 30th at 11AM PDT.

Who: Brian Dennis and Brian McGahan: Co-Founders of Internetwork Expert
What: Major Corporate Announcement
Where: Online Webcast
When: 11 a.m. (PDT) Thursday, October 30th, 2008

—Read The Rest Here—

The posting has an interesting interesting bit:

Current customers please note, this announcement will not affect the status of our Investment Protection Program. All previous, current, and future purchases are still protected under this plan!

I’ll tune in Thursday to see what the announcement is but based on the wording I am hopeful that this means that IE is going to launch Version 5 of the Routing and Switching Class On Demand.

Question Of The Day: 29 October, 2008

Yesterday’s QoD:

Given the following configuration on a 3560 switch:

interface FastEthernet0/1
 switchport access vlan 101

You are tasked with ensuring that all communications are stopped on this port if the spanning-tree protocol is detected on this port.

Which of the following configuration choices best accomplishes this task:

 

Here are the results:

Answer %
spanning-tree bpduguard enable (interface) 85%
spanning-tree portfast bpduguard default (global)   7%
spanning-tree bpdufilter enable (interface) 6%
spanning-tree portfast bpdufilter default (global) 1%

The answer: spanning-tree bpduguard enable (interface)

Get comfortable with the “Configuring Optional Spanning-Tree Features” section of the 3560/3550 configuration guide as you are very likely to see a question or two relating these technologies on your practice labs.  In this case the technology that you want to use is bpduguard.  This feature will completely stop traffic on a port if there is a BPDU received on that port.  This command can be configured at the global or port level with a few differences in operation:

‘spanning-tree bpduguard enable’ under an interface will put the interface into error-disabled mode if a BPDU is received on that port.  The portfast feature does not need to be configured on the interface.

‘spanning-tree portfast bpduguard default’ at the global level will affect all ports on your switch that have the ‘portfast’ feature enabled.  Those ports will be shutdown if they receive a BPDU.

In our question, ‘portfast’ is not enabled on the interface so we need to use ‘spanning-tree bpduguard enable’ under the interface.

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