Switching

Hi community,

we have a VC built-up by x4 Juniper 5100. Mos of the traffic crossing this platform is video mcast traffic and we suspect of mcast traffic lost. Client servers are connected via 10G ports but we also have a probe system connected on a 1Gb port. For this interface we are suffering some lost of traffic on the end system, and while checking the interface counters i saw that around a 0,6% of the mcast is being dropped:

Queue counters: Queued packets Transmitted packets Dropped packets

 8                             0                             3071553518              19857689

Queue number: Mapped forwarding classes

 0 best-effort
3 fcoe
4 no-loss
7 network-control
8 mcast

coS information:
Direction : Output
CoS transmit queue Bandwidth Buffer Priority Limit

8 mcast 20% 2000000000 20% 0 low none

As mcast traffic seems to use up to a 40% of the total BW, i wonder if this can be changed or not as this interface is mostly dideciated for cast traffic. i tried to assigned a different FC but not been succesful. )

any help on this is appreciated.

Thanks

Gab

Hi 

i've tried creating a new scheduler with new transmit and shaping rate percent values as well as priorty so mcast is kind of priorized on the egress interface. i fiind no way to  macth this scheduler to the FC mcast and apply  it on the intended interface. Any help wth this config is apprecaited.

Thanks

Gabi

Hi,

Could you possibly try creating a scheduler-map and then apply the scheduler-map to the interface:

set class-of-service scheduler-maps xxxxx forwarding-class mcast scheduler yyyyy
set class-of-service interfaces xxx scheduler-map xxxxx

Cheers,

Ashvin

Hi Ashvin,

THis is the config i just applied:

+ class-of-service {
+ interfaces {
+ xe-2/0/5 {
+ scheduler-map test-mcst-eth-cos-map;
+ }
+ }
+ scheduler-maps {
+ test-mcst-eth-cos-map {
+ forwarding-class mcast scheduler test_video_mcast_scheduler;
+ }
+ }
+ schedulers {
+ test_video_mcast_scheduler {
+ transmit-rate percent 50;
+ shaping-rate percent 80;
+ buffer-size percent 20;
+ priority strict-high;
+ }
+ }
+ }

but when i commit and i print the interface counters, i dont see that  the queue's BW percentage are changed:

show interfaces xe-2/0/5 extensive:

CoS information:
Direction : Output
CoS transmit queue Bandwidth Buffer Priority Limit
% bps % usec
0 best-effort 5 500000000 5 0 low none
3 fcoe 35 3500000000 35 0 low none
4 no-loss 35 3500000000 35 0 low none
7 network-control 5 500000000 5 0 low none
8 mcast 20 2000000000 20 0 low none

Maybe i missed any ther step on the CoS configuration¿?

Thanks

Gab

It seems the secheduler-map is still the default one

show class-of-service interface xe-2/0/5

Physical interface: xe-2/0/5, Index: 692
Queues supported: 12, Queues in use: 5
Scheduler map: <default>, Index: 2
Congestion-notification: Disabled

Logical interface: xe-2/0/5.0, Index: 607
Object Name Type Index
Classifier ieee8021p-untrust untrust 16

Hi, 

It appears the config is sighlty different on QFX and you may need to add forwarding-class-set and traffic-control-profile.

http://www.juniper.net/documentation/en_US/junos12.3/topics/example/queue-schedulers-cos-configuring.html

Cheers,

Ashvin

Thanks Ashvin

it seems the config was commited succesfuly although priority strict-high was not permitted, i had to change it to low.

on the show interface xe-2/0/5 extensive printout now i dont see the percentages shown or cos information for the trasmit queue , bit strange

traffic-control-profiles {
mcast-video {
scheduler-map test-mcst-eth-cos-map;
}
}
forwarding-class-sets {
fc-mcast-video {
class mcast;
}
}
interfaces {
xe-2/0/5 {
forwarding-class-set {
fc-mcast-video {
output-traffic-control-profile mcast-video;
}
}
}
}
scheduler-maps {
test-mcst-eth-cos-map {
forwarding-class mcast scheduler test_video_mcast_scheduler;
}
}
schedulers {
test_video_mcast_scheduler {
transmit-rate percent 50;
shaping-rate percent 80;
buffer-size percent 20;
priority low;
}
}

Hi, 

You could check for:

show class-of-service interface xe-2/0/5 comprehensive
show interfaces queue xe-2/0/5

Could you share the ouputs including "show interfaces extensive".

Also note since there are now custom config for the schedulers, you will probably see only the configured forwarding-class in the custom scheduler-map applied on that interface which may not be ideal.

Cheers,

Ashvin

Thansk Ashvin.

firts cmd seems to not be supported:

show class-of-service interface xe-2/0/5 comprehensive
error: command is not valid on the qfx5100-96s-8q.

the other one shows the traffic being handled by queue 8, the drops are just the ones happened when i applied the configuration. Right now we have decrease the throughput so i can not check if the scheduler will work fine when going aobve 4xx mbps. I'll try to test it later and let you know.

Thanks!

Gab

show interfaces queue xe-2/0/5
Physical interface: xe-2/0/5, Enabled, Physical link is Up
Interface index: 692, SNMP ifIndex: 610
Forwarding classes: 16 supported, 5 in use
Egress queues: 12 supported, 5 in use
Queue: 0, Forwarding classes: best-effort
Queued:
Packets : 0 0 pps
Bytes : 0 0 bps
Transmitted:
Packets : 0 0 pps
Bytes : 0 0 bps
Tail-dropped packets : Not Available
RL-dropped packets : 0 0 pps
RL-dropped bytes : 0 0 bps
Total-dropped packets: 0 0 pps
Total-dropped bytes : 0 0 bps
Queue: 3, Forwarding classes: fcoe
Queued:
Packets : 0 0 pps
Bytes : 0 0 bps
Transmitted:
Packets : 0 0 pps
Bytes : 0 0 bps
Tail-dropped packets : Not Available
RL-dropped packets : 0 0 pps
RL-dropped bytes : 0 0 bps
Total-dropped packets: 0 0 pps
Total-dropped bytes : 0 0 bps
Queue: 4, Forwarding classes: no-loss
Queued:
Packets : 0 0 pps
Bytes : 0 0 bps
Transmitted:
Packets : 0 0 pps
Bytes : 0 0 bps
Tail-dropped packets : Not Available
RL-dropped packets : 0 0 pps
RL-dropped bytes : 0 0 bps
Total-dropped packets: 0 0 pps
Total-dropped bytes : 0 0 bps
Queue: 7, Forwarding classes: network-control
Queued:
Packets : 0 0 pps
Bytes : 0 0 bps
Transmitted:
Packets : 14767 0 pps
Bytes : 5227518 0 bps
Tail-dropped packets : Not Available
RL-dropped packets : 0 0 pps
RL-dropped bytes : 0 0 bps
Total-dropped packets: 0 0 pps
Total-dropped bytes : 0 0 bps
Queue: 8, Forwarding classes: mcast
Queued:
Packets : 0 0 pps
Bytes : 0 0 bps
Transmitted:
Packets : 4736744788 13600 pps
Bytes : 6451444798496 148189928 bps
Tail-dropped packets : Not Available
RL-dropped packets : 0 0 pps
RL-dropped bytes : 0 0 bps
Total-dropped packets: 23 0 pps
Total-dropped bytes : 31326 0 bps