Please send a backtrace. Here are some general bug reporting suggestions: 
https://wiki.fd.io/view/VPP/BugReports.

I’ve certainly reconfigured the simulator with traffic flowing without having 
the wheels fall off, but the code is brand-new.

Thanks... Dave


From: Brendan Kelly <brendanake...@yahoo.com>
Sent: Wednesday, October 3, 2018 10:39 AM
To: brendanake...@yahoo.com
Cc: Dave Barach (dbarach) <dbar...@cisco.com>; vpp-dev@lists.fd.io
Subject: Re: [vpp-dev] WRED

Hello Dave, if you change the nsim delay values on the fly it appears vpp 
crashes and all the state is lost.

Is this supported?  Should I file a bug?
If so what logs should I attach?

On Oct 3, 2018, at 08:07, Brendan Kelly via Lists.Fd.Io 
<brendanakelly=yahoo....@lists.fd.io<mailto:brendanakelly=yahoo....@lists.fd.io>>
 wrote:
Ok, thanks for the input.  I have it working.

vpp# create bridge-domain 1
bridge-domain 1
vpp# show b
bfd            bier           bond           bridge-domain  buffers
vpp# show bridge-domain 1
  BD-ID   Index   BSN  Age(min)  Learning  U-Forwrd   UU-Flood   Flooding  
ARP-Term   BVI-Intf
    1       1      0     off        on        on       flood        on       
off        N/A

vpp# set interface l2 bridge TenGigabitEthernet82/0/0 1
vpp# set interface l2 bridge TenGigabitEthernet82/0/1 1

vpp# set nsim delay 10 ms bandwidth 10.1 gbit packet-size 128
Configured link delay 10.00 ms, 20.00 ms round-trip
Sim uses 26304512 bytes per thread, 157827072 bytes total

vpp# nsim enable-disable TenGigabitEthernet82/0/0 TenGigabitEthernet82/0/1

vpp# show nsim
Network simulator cross-connects TenGigabitEthernet82/0/0 and 
TenGigabitEthernet82/0/1
...inserting link delay of 10.00 ms, 20.00 ms round-trip


On Wednesday, October 3, 2018, 7:19:00 AM MDT, Dave Barach via Lists.Fd.Io 
<dbarach=cisco....@lists.fd.io<mailto:dbarach=cisco....@lists.fd.io>> wrote:



It would be easy enough for the delay simulator to enable/disable promiscuous 
mode. But it’s handy to bridge the pipes: traffic flows whether or not the 
delay simulation is enabled.



D.



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 Dave Barach via 
Lists.Fd.Io
Sent: Wednesday, October 3, 2018 9:09 AM
To: Brendan Kelly <brendanake...@yahoo.com<mailto:brendanake...@yahoo.com>>; 
vpp-dev@lists.fd.io<mailto:vpp-dev@lists.fd.io>
Cc: vpp-dev@lists.fd.io<mailto:vpp-dev@lists.fd.io>
Subject: Re: [vpp-dev] WRED



Put the interfaces in an L2 bridge group, or they won’t be in promiscuous 
mode...



Here’s a config that I use a bunch:



set int l2 bridge FortyGigabitEthernet86/0/1 1

set int state FortyGigabitEthernet86/0/1 up

set int l2 bridge TenGigabitEthernetd/0/0 1

set int state TenGigabitEthernetd/0/0 up



bin nsim_configure delay 10 ms bandwidth 10.1 gbit packet-size 128

bin nsim_enable_disable FortyGigabitEthernet86/0/1 TenGigabitEthernetd/0/0



HTH... Dave



From: Brendan Kelly <brendanake...@yahoo.com<mailto:brendanake...@yahoo.com>>
Sent: Tuesday, October 2, 2018 10:03 PM
To: vpp-dev@lists.fd.io<mailto:vpp-dev@lists.fd.io>; Dave Barach (dbarach) 
<dbar...@cisco.com<mailto:dbar...@cisco.com>>
Subject: Re: [vpp-dev] WRED



Hello Dave, doesn't appear to forward.  My ARP packets are not being forwarded. 
 I assume in this cross connect any packet in an interface is sent out the 
other interface and vice versa?



Anything special needed in the startup.conf?



vpp# show nsim

Network simulator cross-connects TenGigabitEthernet82/0/0 and 
TenGigabitEthernet82/0/1

...inserting link delay of 200.00 ms, 400.00 ms round-trip





On Tuesday, October 2, 2018, 6:00:42 AM MDT, Dave Barach via Lists.Fd.Io 
<dbarach=cisco....@lists.fd.io<mailto:dbarach=cisco....@lists.fd.io>> wrote:





With respect to delay / loss impairments, please have a look at the “nsim” 
plugin: src/plugins/nsim.

From: <vpp-dev@lists.fd.io<mailto:vpp-dev@lists.fd.io>> on behalf of 
"brendanakelly via Lists.Fd.Io" 
<brendanakelly=yahoo....@lists.fd.io<mailto:yahoo....@lists.fd.io>>
Reply-To: "brendanake...@yahoo.com<mailto:brendanake...@yahoo.com>" 
<brendanake...@yahoo.com<mailto:brendanake...@yahoo.com>>
Date: Monday, October 1, 2018 at 6:18 PM
To: "vpp-dev@lists.fd.io<mailto:vpp-dev@lists.fd.io>" 
<vpp-dev@lists.fd.io<mailto:vpp-dev@lists.fd.io>>
Cc: "vpp-dev@lists.fd.io<mailto:vpp-dev@lists.fd.io>" 
<vpp-dev@lists.fd.io<mailto:vpp-dev@lists.fd.io>>
Subject: [vpp-dev] WRED

I am looking to setup vpp with WRED.  I am not sure how the WRED profiles are 
configured.  I have hqos with 2 interfaces working in a bridge-domain and now 
want to enable WRED.

My overall goal is to simulate the Linux tc "traffic control" application to 
run impairments such as delay and packet loss.

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