Attached is the sample VPP commands script, having a delay of 50 ms. Below is
the screenshot of he output we get on running the script : -
Request 88 : time 14:05:01.906
Request 89 : time 14:05:01.906
Request 90 : time 14:05:02.043
_______ _ _ _____ ___
__/ __/ _ \ (_)__ | | / / _ \/ _ \
_/ _// // / / / _ \ | |/ / ___/ ___/
/_/ /____(_)_/\___/ |___/_/ /_/
vpp# Request 91 : time 14:05:02.043
_______ _ _ _____ ___
__/ __/ _ \ (_)__ | | / / _ \/ _ \
_/ _// // / / / _ \ | |/ / ___/ ___/
/_/ /____(_)_/\___/ |___/_/ /_/
vpp# Request 92 : time 14:05:02.213
Request 93 : time 14:05:02.213
Request 94 : time 14:05:02.358
The commands are executed sequentially at a gap of 50 ms. As seen from the
execution time displayed by the script, we never see a situation where the gap
is more than 1 sec.
Can you please guide us through this?
Thanks and Regards,
Chinmaya Agarwal.
________________________________
From: Luke, Chris <chris_l...@comcast.com>
Sent: Tuesday, May 26, 2020 7:34 PM
To: Luke, Chris <chris_l...@comcast.com>; Chinmaya Aggarwal
<chinmaya.agar...@hsc.com>; vpp-dev@lists.fd.io <vpp-dev@lists.fd.io>
Subject: RE: [EXTERNAL] Re: [vpp-dev] VPP sequential policy command execution
giving error
CAUTION:This email originated from an external organization
Actually, I missed one detail, if you tell vppctl to run a command using its
command line arguments, it will always assume non-interactive.
The only way you’ll see the banner, then, is if the 1s session startup timer
expires and it makes assumptions. In those cases that you see the output, does
the script you run stall for a second?
Chris.
From: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io> On Behalf Of Chris Luke
Sent: Tuesday, May 26, 2020 09:40
To: Chinmaya Aggarwal <chinmaya.agar...@hsc.com>; vpp-dev@lists.fd.io
Subject: Re: [EXTERNAL] Re: [vpp-dev] VPP sequential policy command execution
giving error
You’ll get the banner if it thinks it’s an interactive session.
Roughly vppctl does this (I am paraphrasing):
is_interactive = isatty(STDIN);
…
if (is_interactive) TERM = “vppctl”;
…
open telnet session to the CLI socket; pass the terminal information
Then in VPP:
is_interactive = (strcmp(TERM, “vppctl”) != 0);
…
if (is_interactive) emit_banner();
The passing of the terminal options in the TELNET protocol is bounded by a
timer (1 second); if for whatever reason that information arrives late, VPP
will make assumptions; typically that the terminal is of the ‘dumb’ type rather
than non-interactive.
Does this correlate to what you are observing? Does the output you see make use
of ANSI color? That would be another clue, the ‘dumb’ terminal doesn’t use
color.
Chris.
From: vpp-dev@lists.fd.io<mailto:vpp-dev@lists.fd.io>
<vpp-dev@lists.fd.io<mailto:vpp-dev@lists.fd.io>> On Behalf Of Chinmaya Aggarwal
Sent: Tuesday, May 26, 2020 08:19
To: vpp-dev@lists.fd.io<mailto:vpp-dev@lists.fd.io>
Subject: [EXTERNAL] Re: [vpp-dev] VPP sequential policy command execution
giving error
Further adding to observations regarding above issue, we have created a script
that has only vpp commands running sequentially having a constant delay between
the execution of each commands. On running the script, we again see VPP shell
output as shown below :-
_______ _ _ _____ ___
__/ __/ _ \ (_)__ | | / / _ \/ _ \
_/ _// // / / / _ \ | |/ / ___/ ___/
/_/ /____(_)_/\___/ |___/_/ /_/
We executed the script with delay of 10ms, 50ms and 100ms. In most of the
cases, we get no output from vppctl command but in some random times, we get
the vpp shell as output of the command.
Please suggest, in what scenarios does the vpp return this kind of output?
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echo " request 1"
counter=1
vppctl sr policy add bsid 6d97:5fd3:fd2b:ee77:24a0:d358:c873:9a98 next
2001:19:c1::1 insert spray weight 1
vppctl sr policy mod bsid 6d97:5fd3:fd2b:ee77:24a0:d358:c873:9a98 add sl next
2001:19:c2::1 insert spray weight 1
vppctl sr steer l3 2001:5b0:5678:1::/64 via bsid
6d97:5fd3:fd2b:ee77:24a0:d358:c873:9a98
sleep 0.050
request1_time="$(date +"%T.%3N")"
echo "Request $counter : time $request1_time"
vppctl sr policy mod bsid 6d97:5fd3:fd2b:ee77:24a0:d358:c873:9a98 del sl index
0 && echo " unicast request 1 " ;
sleep 0.050
for ((i=2;i<=50;i++)); do
# echo " request $i"
counter=$((counter+1))
request1_time="$(date +"%T.%3N")"
echo "Request $counter : time $request1_time"
vppctl sr policy mod bsid 6d97:5fd3:fd2b:ee77:24a0:d358:c873:9a98 add sl
next 2001:19:c1::1 insert spray weight 1;
sleep 0.050
counter=$((counter+1))
request2_time="$(date +"%T.%3N")"
echo "Request $counter : time $request1_time"
vppctl sr policy mod bsid 6d97:5fd3:fd2b:ee77:24a0:d358:c873:9a98 del sl
index 0;
sleep 0.050
done
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