How to know the routing table convergence time?

[haoran zhou]

Hello sir, I would like to know the time it takes for the routing table to converge again after the bgp session changes. My current guess is that the answer lies in the trace file.

[haoran zhou]

How does he know that the network will converge when the time is 117.5?

So I ran the sample on my computer and found this in the output file.

I found that there were many messages near 117.5. Although I did not understand the meaning of these messages, I guessed that this person concluded that the network converged at 117.5 because he observed these messages in the output file.

Am I right? gentlemen.

[knudfl]

Sorry, not "readable"  https://unix.meta.stackexchange.com/questions/4086/psa-please-dont-post-images-of-text

My comments : I guess you know how to copy-paste a text.
And :   Images with text will often not be read.

[haoran zhou]

I'm sorry, Sir.
This is the link to the document。

reconnect.txt

reconnect.nam

I will gradually learn the wisdom of asking questions.

[haoran zhou]

Hello Sir, this is the content of the document, if you can help me, I would be very grateful

[haoran zhou]

I'm sorry Sir, I'm using google Cloud drive for the first time, so I forgot to give you access, it's already open to share.

haoran zhou <zhouhao...@gmail.com> 于2023年10月15日周日 18:52写道：

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[knudfl]

Your zhouhao-reconnect-1.tcl is different from my BGP-ex/reconnect.tcl

$ diff -dbBwaur reconnect.tcl zhouhao-reconnect-1.tcl

Note : New files should have new file names. You cannot have two files with the same file name.

? About "timing" and "converge figures" :

The simulation text ends with these lines ...........

#* These times are recorded with "jitter_factor_seed" set to 12345.
#  (Please see file bgp/global.h)

...........  BGP-ex/reconnect.tcl , lines 93-94

About trace : The example 2reconnect.tcl can create out.tr

set nf [open reconnect.nam w]
$ns namtrace-all $nf
set tracefd        [open out.tr w]
$ns trace-all $tracefd

............ Files :  https://drive.google.com/drive/folders/1_sWDm9zWDNhLmcvBAgIPeqSiFsa-qTQn?usp=drive_link

[haoran zhou]

Yes Sir, I have read the bgp/global.h.  

The files are different, but that's not the point, the point is that I can't read the ns-bgp output file, I mean reconnect.nam.

For example, several lines are as follows:

"

V -t * -v 1.0a5 -a 0
A -t * -n 1 -p 0 -o 0x7fffffff -c 30 -a 1
A -t * -h 1 -m 1073741823 -s 0
n -t * -a 167772161 -s 0 -S UP -v circle -c black -i black
n -t * -a 167837953 -s 1 -S UP -v circle -c black -i black
n -t * -a 167903745 -s 2 -S UP -v circle -c black -i black
l -t * -s 0 -d 1 -S UP -r 1000000 -D 0.001 -c black
l -t * -s 0 -d 2 -S UP -r 1000000 -D 0.001 -c black
+ -t 0.01 -s 0 -d 1 -p tcp -e 40 -c 0 -i 0 -a 0 -x {167772161.180 167837953.179 0 ------- null}
- -t 0.01 -s 0 -d 1 -p tcp -e 40 -c 0 -i 0 -a 0 -x {167772161.180 167837953.179 0 ------- null}
h -t 0.01 -s 0 -d 1 -p tcp -e 40 -c 0 -i 0 -a 0 -x {167772161.180 167837953.179 -1 ------- null}
+ -t 0.01 -s 0 -d 2 -p tcp -e 40 -c 0 -i 1 -a 0 -x {167772161.181 167903745.179 0 ------- null}
- -t 0.01 -s 0 -d 2 -p tcp -e 40 -c 0 -i 1 -a 0 -x {167772161.181 167903745.179 0 ------- null}
h -t 0.01 -s 0 -d 2 -p tcp -e 40 -c 0 -i 1 -a 0 -x {167772161.181 167903745.179 -1 ------- null}
+ -t 0.01 -s 1 -d 0 -p tcp -e 40 -c 0 -i 2 -a 0 -x {167837953.180 167772161.179 0 ------- null}
- -t 0.01 -s 1 -d 0 -p tcp -e 40 -c 0 -i 2 -a 0 -x {167837953.180 167772161.179 0 ------- null}
h -t 0.01 -s 1 -d 0 -p tcp -e 40 -c 0 -i 2 -a 0 -x {167837953.180 167772161.179 -1 ------- null}
+ -t 0.01 -s 2 -d 0 -p tcp -e 40 -c 0 -i 3 -a 0 -x {167903745.180 167772161.179 0 ------- null}
- -t 0.01 -s 2 -d 0 -p tcp -e 40 -c 0 -i 3 -a 0 -x {167903745.180 167772161.179 0 ------- null}
h -t 0.01 -s 2 -d 0 -p tcp -e 40 -c 0 -i 3 -a 0 -x {167903745.180 167772161.179 -1 ------- null}

"

This is not the same as the normal ns file format, and I have not found an explanation for it on the web

In addition, the routing table convergence I refer to means that when the network changes, the routing table no longer exchanges information and reaches a stable state.

So I want to know after I execute the ns-bgp file, how do I know that the routing table converges properly? I want to find this moment.

[knudfl]

Google      ns2 trace file

No official "Online documentation" any more from nsnam.com  ... any more.

My old backup :  tracefile-doc.tar.gz
https://drive.google.com/file/d/0B7S255p3kFXNeS1weGNuVWwwLWc/view?usp=sharing

Look for 'NS-2 Trace Formats - nsnam.html' ... that's the original nsnam doc

The "NAM Trace Formats" is the bottom section ....