Re: Cisco WS-C2960S-48FPS-L drop outs on IPTV connected ports

dawidku · ‎10-09-2023

Hello

We have as setup with 2960 switch and IPTVs, some rooms have TVs connected to the switch port directly and those showing increasing drop outs on ports and TVs having pixelated image or freezing picture.

Some other rooms have their IPTV connected to the in room Wi-Fi access point and TVs in those rooms are working with no issue.
How do I go about troubleshooting this / finding a cause of the drop outs?

balaji.bandi · ‎10-09-2023

how is your configuration looks like on the switch, do you IGMP enabled ?

can you post the interface drops you mentioned by issue command show interface x/x

what version of IOS code running ?

also check what SDM template using and post show platform tcam table to view

use below guide :

https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960/software/release/12-2_55_se/command/reference/2960_cr/showplat.html

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dawidku · ‎10-09-2023

Thanks for a quick reply, here it is:

- Cisco IOS Software, C2960S Software (C2960S-UNIVERSALK9-M), Version 12.2(58)SE2, RELEASE SOFTWARE (fc1)

- ip igmp snooping vlan xxx immediate-leave

#show int gi1/0/35              
GigabitEthernet1/0/35 is up, line protocol is up (connected) 
  Hardware is Gigabit Ethernet, address is 0008.30d3.80a3 (bia 0008.30d3.80a3)
  Description: TV-Room-XYZ
  MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec, 
     reliability 255/255, txload 97/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 100Mb/s, media type is 10/100/1000BaseTX
  input flow-control is off, output flow-control is unsupported 
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 2y31w, output 00:00:01, output hang never
  Last clearing of "show interface" counters 01:09:19
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 12112
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 13000 bits/sec, 14 packets/sec
  5 minute output rate 38360000 bits/sec, 3597 packets/sec
     155888 packets input, 21483446 bytes, 0 no buffer
     Received 904 broadcasts (486 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 486 multicast, 0 pause input
     0 input packets with dribble condition detected
     17345176 packets output, 23049014567 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 unknown protocol drops
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 pause output
     0 output buffer failures, 0 output buffers swapped out

#show sdm prefer
 The current template is "default" template.
 The selected template optimizes the resources in
 the switch to support this level of features for
 0 routed interfaces and 255 VLANs. 

  number of unicast mac addresses:                  8K
  number of IPv4 IGMP groups:                       0.25K
  number of IPv6 multicast groups:                  0.25K
  number of IPv4/MAC qos aces:                      0.375k
  number of IPv4/MAC security aces:                 0.375k
  number of IPv6 policy based routing aces:         0
  number of IPv6 qos aces:                          0
  number of IPv6 security aces:                     0.125k

Do you need to see output from show platform tcam table all command?

balaji.bandi · ‎10-09-2023

show platform tcam table all - yes help to see how utilisation

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dawidku · ‎10-09-2023

Here it is, sorry for the delay.

Joseph W. Doherty · ‎10-09-2023

". . . some rooms have TVs connected to the switch port directly and those showing increasing drop outs on ports and TVs having pixelated image or freezing picture."

If ports are showing output drop, while IPTV active, drops tend to be detrimental to video.

If ONLY a IPTV receiver is connected to a port, increasing egress queue size might be sufficient to mitigate the drops.

If IPTV receiver is sharing the port with another device, additionally, QoS might be needed.

BTW, what's the IOS being used?

dawidku · ‎10-09-2023

Switches are running this version of IOS

Cisco IOS Software, C2960S Software (C2960S-UNIVERSALK9-M), Version 12.2(58)SE2, RELEASE SOFTWARE (fc1)

Leo Laohoo · ‎10-09-2023

@dawidku wrote:

  5 minute output rate 38360000 bits/sec, 3597 packets/sec

That is huge for a single IPTV platform.

How many of these are on the same switch?

Post the complete output to the command "sh interface <UPLINK> controll".

dawidku · ‎10-10-2023

There seems to be 12 TVs connected to this switch, few directly and few over the in room access point.
See below output for 2 uplink interfaces.

#show int gi1/0/51 controll
GigabitEthernet1/0/51 is up, line protocol is up (connected) 
  Hardware is Gigabit Ethernet, address is 0008.30d3.80b3 (bia 0008.30d3.80b3)
  Description: switch-3750-FibreDist
  MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec, 
     reliability 255/255, txload 1/255, rxload 2/255
  Encapsulation ARPA, loopback not set
  Keepalive not set
  Full-duplex, 1000Mb/s, link type is auto, media type is 1000BaseSX SFP
  input flow-control is off, output flow-control is unsupported 
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:01, output 00:00:03, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 9831000 bits/sec, 7595 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     334377119207 packets input, 64478766896793 bytes, 0 no buffer
     Received 288609765287 broadcasts (3873265162 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 3873265162 multicast, 0 pause input
     0 input packets with dribble condition detected
     12776966 packets output, 3888622893 bytes, 0 underruns
     0 output errors, 0 collisions, 1 interface resets
     0 unknown protocol drops
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 pause output
     0 output buffer failures, 0 output buffers swapped out

     Transmit GigabitEthernet1/0/51           Receive
   3888622893 Bytes                       2723478455 Bytes                    
       255762 Unicast frames              2817682723 Unicast frames           
     12519384 Multicast frames            3873269637 Multicast frames         
         1820 Broadcast frames            1268712703 Broadcast frames         
            0 Too old frames              3269400570 Unicast bytes            
            0 Deferred frames              610390923 Multicast bytes          
            0 MTU exceeded frames         3898078174 Broadcast bytes          
            0 1 collision frames                   0 Alignment errors         
            0 2 collision frames                   0 FCS errors               
            0 3 collision frames                   0 Oversize frames          
            0 4 collision frames                   0 Undersize frames         
            0 5 collision frames                   0 Collision fragments      
            0 6 collision frames       
            0 7 collision frames           489007595 Minimum size frames      
            0 8 collision frames          2930127670 65 to 127 byte frames    
            0 9 collision frames          1082473447 128 to 255 byte frames   
            0 10 collision frames         3179211054 256 to 511 byte frames   
            0 11 collision frames         1112604136 512 to 1023 byte frames  
            0 12 collision frames         2893014500 1024 to 1518 byte frames 
            0 13 collision frames                  0 Overrun frames           
            0 14 collision frames                  0 Pause frames             
            0 15 collision frames      
            0 Excessive collisions                 0 Symbol error frames      
            0 Late collisions                      0 Invalid frames, too large
            0 VLAN discard frames          568193957 Valid frames, too large  
            0 Excess defer frames                  0 Invalid frames, too small
      4992280 64 byte frames                       0 Valid frames, too small  
         5253 127 byte frames          
         3554 255 byte frames                      0 Too old frames           
      7399935 511 byte frames                      0 Valid oversize frames    
       128785 1023 byte frames                     0 System FCS error frames  
       246826 1518 byte frames                     0 RxPortFifoFull drop frame
          333 Too large frames         
            0 Good (1 coll) frames     
            0 Good (>1 coll) frames

#show int gi1/0/52 controll
GigabitEthernet1/0/52 is up, line protocol is up (connected) 
  Hardware is Gigabit Ethernet, address is 0008.30d3.80b4 (bia 0008.30d3.80b4)
  Description: switch-3750-FibreDist
  MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec, 
     reliability 255/255, txload 3/255, rxload 14/255
  Encapsulation ARPA, loopback not set
  Keepalive not set
  Full-duplex, 1000Mb/s, link type is auto, media type is 1000BaseSX SFP
  input flow-control is off, output flow-control is unsupported 
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:01, output 00:00:03, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 6033
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 56103000 bits/sec, 12270 packets/sec
  5 minute output rate 15115000 bits/sec, 1646 packets/sec
     378292895122 packets input, 108430553333406 bytes, 0 no buffer
     Received 286056939992 broadcasts (1474450879 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 1474450879 multicast, 0 pause input
     0 input packets with dribble condition detected
     194872374621 packets output, 260768337975371 bytes, 0 underruns
     0 output errors, 0 collisions, 1 interface resets
     0 unknown protocol drops
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 pause output
     0 output buffer failures, 0 output buffers swapped out

     Transmit GigabitEthernet1/0/52           Receive
   3696980027 Bytes                       4117336467 Bytes                    
    615740976 Unicast frames              2041643254 Unicast frames           
    827728955 Multicast frames            1474460351 Multicast frames         
    155379325 Broadcast frames            1114655955 Broadcast frames         
            0 Too old frames              1451343812 Unicast bytes            
            0 Deferred frames             1395449168 Multicast bytes          
            0 MTU exceeded frames         2457448871 Broadcast bytes          
            0 1 collision frames                   0 Alignment errors         
            0 2 collision frames                   0 FCS errors               
            0 3 collision frames                   0 Oversize frames          
            0 4 collision frames                   0 Undersize frames         
            0 5 collision frames                   0 Collision fragments      
            0 6 collision frames       
            0 7 collision frames           489005761 Minimum size frames      
            0 8 collision frames          2614054366 65 to 127 byte frames    
            0 9 collision frames          3508389222 128 to 255 byte frames   
            0 10 collision frames         1323867063 256 to 511 byte frames   
            0 11 collision frames         2081952452 512 to 1023 byte frames  
            0 12 collision frames          732708901 1024 to 1518 byte frames 
            0 13 collision frames                  0 Overrun frames           
            0 14 collision frames                  0 Pause frames             
            0 15 collision frames      
            0 Excessive collisions                 0 Symbol error frames      
            0 Late collisions                      0 Invalid frames, too large
            0 VLAN discard frames         2470716387 Valid frames, too large  
            0 Excess defer frames                  0 Invalid frames, too small
      4992285 64 byte frames                       0 Valid frames, too small  
    934568917 127 byte frames          
   1597448186 255 byte frames                      0 Too old frames           
   2733332153 511 byte frames                      0 Valid oversize frames    
   2903642270 1023 byte frames                     0 System FCS error frames  
   1372278713 1518 byte frames                     0 RxPortFifoFull drop frame
    642521324 Too large frames         
            0 Good (1 coll) frames     
            0 Good (>1 coll) frames

Joseph W. Doherty · ‎10-10-2023

Too large frame stats?

Leo Laohoo · ‎10-10-2023

12.2(58)SE train is a trainwreck. It is one of the buggiest train Cisco has released to the public. So much so, no further development or improvements were made after 12.2(58)SE2. Every users were encouraged to use either 12.2(55)SE train, 15.0(2)SE or 15.2(2)E9.

Leo Laohoo · ‎10-10-2023

Increase the MTU of the switch.

dawidku · ‎10-11-2023

What MTU value would you recommend?

Joseph W. Doherty · ‎10-10-2023

I recall any 12.2(58) release was somewhat problematic, at least on 3750s.

Further, often early releases, in a software train (your SE2) tend to be more problematic.

I'm not saying your IOS version has any impact on your issue, but, personally I hate bumping into software defects that were fixed years ago.

@Leo Laohoo any comments about this particular IOS version?

dawidku · ‎10-11-2023

Thank you all for the suggestions, I will speak with the site manager and will try to implement some of this

starting with MTU size first and look into changing firmware version. I will report results later.