Henry's Points

After 7 hours, at 1:26AM, I finally got email from CISCO for CCIE report. Yes, I passed, the CCIE number is 25198. It doesn’t mean much to me because this is only my first milestone to be achieved. I may continuously go other tracking, such as security and voice.

The testing is harder than I expected because you cannot grasp the right pace. When I put a lot of time on Switching part and haven’t finish IGP by the lunch, I felt really frustrated. However, It’s very important to build infrastructure correct, otherwise, all multicast part and BGP part will have trouble.

The InternetExpert helped me a lot. I would like to thank them for many detailed materials.

Tags: So we travel by hengdu
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The command that we can see originate prefixs in BGP is “show ip bgp reg ^$” . There are four ways to originate prefix.

1. aggregate-address

Aggregate-address in BGP is summarization or superneting like IGP summary-address. When execute this command, the specific route must be in BGP routing table. BGP will advertise both aggregated address and specific routes to the neighbor. If we don’t want specific routes to be advertised, “summary-only” key word need to be used.

2. network statement

When configure “network 192.168.50.0 mask 255.255.255.0″, it actually tell router to import network 192.168.50.0 with subnet mask 255.255.255.0 from IGP route table to LocRIB. If there is no such entry on IGP table, nothing will be installed in LocRIB. If importing is successful, there is an entry on LocRIB which originated by router itself.

3. redistribute

If we have been asked to let router advertise a summary major network 191.1.0.0/16 into BGP, we can create a static route point to Null0. Then, redistribute static route into BGP

router bgp 200
redistribute static
ip route 191.1.0.0 255.255.0.0 Null0

4. inject-map

Inject-map is opposite operation of aggregate-address. Sometimes we call it “de-aggregate”. We need two route-map. One route map is declare injected prefix by using set ip address prefix-list <inject-prefix-list> and some attributes which is needed to be setup. (Weight is default 0 in stead of 32768). The other route map is existed aggregate prefix and its originator by using match ip address prefix-list <aggregate-prefix-list> and match ip route-source prefix-list <originator-prefix-list>.

Tags: BGP, Networks by hengdu
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It’s actually an application named recordmydesktop, which can be installed by sudo apt-get install recordmydesktop.

There are various kinds of purpose to use, but for me, I would like to present or show some mock-up to other people. I made a simple file

#!/bin/bash
recordmydesktop -windowid $( xwininfo -frame | awk ‘/Window id:/ {print $4}’ )

After running this script, there is a cross cursor which allows you to select a window. As soon as the window is selected, the recording start. To end the recording, simply type Ctrl+C. After several lines of screen output, there is a .ogv file generated.

You can use Movie Player to view the file if you are using Linux. However, you can still view this file by using VLC, which can be installed to both Mac and Windows.

Tags: How-to, Linux by hengdu
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