Telecom

No more to say : http://www.gns3.com

To beeing keep updated : this new routers seems really well : IOS XE (IOSd over Linux, virtualization, …).

You can learn more about them on : http://lostintransit.se/2014/10/04/cisco-adds-new-routers-in-the-isr-4000-family/

Have fun to read this great article…

It is been a while that I read some papers about EVC, flexible matching, … But I have not found a good paper explaining EVC and a way to understanding well except to cisco configuration guide.

 

This figure is exactly what I searched for. This example is simple but enough to understand well how it works.

My misunderstanding was about “ingress” and “symmetric” : I didn’t understand, but now with the figure that it is clear that :

BFD is a mecanism which give you access to a fast switchover for IGP, EBGP, … It is a RFC protocol : RFC5880.

BFD is a UDP protocol.

• BFD control : UDP / 3784
• BFD echo : UDP / 3785

BFD is in use on a segment, when a protocol needs it (such as : OSPF). It is configured by interface and called in protocol configuration. When BFD detect a failure it informs upper protocols and helps to make a better / quick convergence.

Surfing the web I have found this app for smartphone : networktools he.net.

It is really great :)

To understand well path through new chassis such as ASR9K, you could see this video (from Cisco Live 2014) and this blog post written by Ivan Pepelnjak, CCIE#1354. You could make a join between VOQ for QOS and LPTS/VOIP for ASR9K.

Have fun :)

It is not a news for CCIE student that today is the last day to pass CCIE lab in version 4. I hope the best for all the students whom will work hard today towards their digits.

Tomorrow is future : CCIE v5 is here. It is the version I will pass. A little review :

Bye bye to :

• Flexlink, ISL, Layer 2 Protocol Tunneling
• Frame-Relay (LFI, FR Traffic Shaping)
• WCCP
• IOS Firewall and IPS
• RITE, RMON
• RGMP
• RSVP QoS, WRR/SRR

Welcome to new technologies :

Sometimes you need to remove SSH so that your customer will be able to access SSH behind NAT.

You can do this by means of :

no crypto key generate rsa

you device will reply you : no no !! You must do this :

crypto key zeroize rsa

such as :

Router(config)#no crypto key generate rsa 
% Use 'crypto key zeroize rsa' to delete signature keys.

Router(config)#crypto key zeroize rsa
% All RSA keys will be removed.
% All router certs issued using these keys will also be removed.
Do you really want to remove these keys? [yes/no]: yes
Router(config)#

For those of you who are planning your CCIE v5 lab, it can be useful to plan it by means of a spreadsheet instead of the PDF you can download on CLN.

You can download a XLS file here : blueprint-ccie-lab-v5.

All is in the title. After more than one year to study, I pass today CCIE R&S Written v4 :)