cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
Announcements

Cisco announces new innovations in SD-WAN, ISRs, SD-WAN Services, and Catalyst 9000 Series switches


177
Views
0
Helpful
15
Replies
Highlighted
Beginner

UDP Drop in 2960

Hi ....

I have a Cisco switch 2960 24-port with 20 camera connected it
Sometimes camera images are displayed in black. (in NVR)

While the Ping connection is in place
What causes this problem?
There is a way to see the drop packets? (without using monitoring equipment)

 

Thank you for help and guidance

Everyone's tags (1)
15 REPLIES
VIP Engager

Re: UDP Drop in 2960

Do you have any QoS in Place, how far the recorder and Camera in the network, what are the devices in the Path ?

 

post all the configuration to have look. ?

 

BB
*** Rate All Helpful Responses ***
Beginner

Re: UDP Drop in 2960

Unused Qos in Network Implementation

VIP Mentor

Re: UDP Drop in 2960

Hello,

 

in addition to Balaji's post, what brand/model are the cameras ?

VIP Advisor

Re: UDP Drop in 2960

Just to add to your original question , this is how i have tested packets drops on specific voice video systems when no monitoring tools in place

QOS may fix it anyway as it should provide some protection to the traffic but if it doesn't it will allow you to test further

apply L2 auto qos then ping via TOS value under an extended ping and see if the counters are dropping in the qos policys
You would need to know the DSCP value (maybe AF41 video ) that the system is using then convert it to TOS you could run the ping check then specific to that value based against the DSCP value , its a bit more complicated than looking at a monitoring system but it should work

Type ping hit return to get to extended mode

DSCP to TOS chart
https://irfansalam.wordpress.com/2013/07/17/tos-values-calculator/

so this below would test for Voice packet drops based on DSCP EF matching TOS value 184

Target IP address: 10.1.1.1
Repeat count [5]: 100
Datagram size [100]:
Timeout in seconds [2]:
Extended commands [n]: y
Source address or interface: 10.1.1.1
Type of service [0]: 184
Beginner

Re: UDP Drop in 2960

AVtech

Beginner

Re: UDP Drop in 2960

AVtech

VIP Mentor

Re: UDP Drop in 2960

Hello,

 

from what I can find in the manuals, it looks like the cameras use port 80 by default. You could try and use a less common port, since 80 is used for a lot of Internet browsing traffic...

Beginner

Re: UDP Drop in 2960

There are no traffic on the network, and only the camera is there
VIP Engager

Re: UDP Drop in 2960

coming back to my question i have asked, provide configuration and port information ?

 

BB
*** Rate All Helpful Responses ***
Beginner

Re: UDP Drop in 2960

I have one vlan for cctv (vlan = 40)
all port is access-vlan 40
one interface connect to NVR and other interfaces connect to cameras.
network is 10.40.1.0/24
and three are no other traffic in switch(all interface is 1G)
camera brand is AVtech and 2MP
VIP Expert

Re: UDP Drop in 2960

So, all the video streams would egress out the NVR port? If so, what's that port's stats?
VIP Expert

Re: UDP Drop in 2960

"What causes this problem?"

Possibly due to dropped packets.

"There is a way to see the drop packets? (without using monitoring equipment)"

Yes, might require a command to show stats at the ASIC level. (Sorry, off-the-top-of-my-head, don't recall actual commands, but they do exist.)

BTW, the 2960's series have a somewhat small buffer RAM shared by all its ports, so if any port is busting above its capacity, it often will drop packets. If this is only happening on one or a few ports, it's possible to configure the 2960 to "better" share its buffer RAM (decreasing such drops).
Beginner

Re: UDP Drop in 2960

What solution do you have for solving this problem?
VIP Advisor

Re: UDP Drop in 2960

As a quick fix to protect the UDP if only the cameras are on these switches i would try basic auto qos
You can use this under the camera interface and the uplinks see if it makes a difference , it shouldnt break anything and can be removed if it doesnt work

All our video switches or anything running real time traffic has qos to ensure its protected at some level and not dropped

mls qos trust dscp
auto qos trust dscp
CreatePlease to create content
Content for Community-Ad
Blog-Cisco Community Designated VIP Class of 2019