Packages oversized can cause loss of packets with Dell PC6248

Hello

We are seeing packet loss on our voice network which causes the phone sometimes sounds without interruption.  This could be the result of oversized packets (more details below).  On a separate note, if I transfer images using Windows Deployment Services multicast it floods all ports (so I don't more :-).  I had initially activated IGMP but he already caused the switch block at random which may have been connected with firmware earlier.

We have the fairly simple network:

  1. 3 Dell PC6248s connected in a star (dist 1 and 2 switches access) topology connected together with LAG trunks running latest firmware.
  2. Several VLANS: voice VLAN (100) production data for IP phones, the vlan 1, dev on vlan 5.
  3. IP phones are mainly Aastra 9133i popular with some Polycom.

I dug more and we are seeing a certain 'oversized packages' on the LAG trunks.  I was wondering if it is at the origin of packets to drop.  If Yes, can I change the MTU size to 1522 (I read that marking adds 4 bytes to the default MTU of 1518) or is there a configuration error I forget somewhere?

    • show rmon statistics port-channel 1
      
      Port: ch1Dropped: 0Octets: 3436040607  Packets: 947867566Broadcast: 1158102  Multicast: 24535676CRC Align Errors: 0  Collisions: 0Undersize Pkts: 0  Oversize Pkts: 43969059Fragments: 0  Jabbers: 064 Octets: 24107589  65 - 127 Octets: 868940536128 - 255 Octets: 133380606  256 - 511 Octets: 76138498512 - 1023 Octets: 90380909  1024 - 1518 Octets: 72636117
      
    • show statistics port-channel 1
      
      Total Packets Received (Octets)................ 175230301131Packets Received > 1518 Octets................. 43968808Packets RX and TX 64 Octets.................... 24107385Packets RX and TX 65-127 Octets................ 868914890Packets RX and TX 128-255 Octets............... 133371613Packets RX and TX 256-511 Octets............... 76133886Packets RX and TX 512-1023 Octets.............. 90379490Packets RX and TX 1024-1518 Octets............. 72634059Packets RX and TX 1519-2047 Octets............. 4344763899Packets RX and TX 2048-4095 Octets............. 0Packets RX and TX 4096-9216 Octets............. 0
      
      Total Packets Received Without Errors.......... 947838588Unicast Packets Received....................... 922145059Multicast Packets Received..................... 24535481Broadcast Packets Received..................... 1158048
      
      Total Packets Received with MAC Errors......... 0Jabbers Received............................... 0Fragments/Undersize Received................... 0Alignment Errors............................... 0FCS Errors..................................... 0Overruns....................................... 0802.3x Pause Frames Received................... 0Unacceptable Frame Type........................ 0
      
      Total Packets Transmitted (Octets)............. 6732668920146Packets Transmitted > 1518 Octets ............. 5827795Max Frame Size................................. 1518
      
      Total Packets Transmitted Successfully......... 367499338Unicast Packets Transmitted.................... 4651719996Multicast Packets Transmitted.................. 5064125Broadcast Packets Transmitted.................. 5682513
      
      Total Transmit Errors.......................... 0FCS Errors..................................... 0Underrun Errors................................ 0
      
      Total Transmit Packets Discarded............... 0Single Collision Frames........................ 0Multiple Collision Frames...................... 0Excessive Collision Frames..................... 0
      
      802.3x Pause Frames Transmitted................ 0GVRP PDUs received............................. 0GVRP PDUs Transmitted.......................... 0GVRP Failed Registrations...................... 0BPDU: sent 1286910, received 9
      

Here is the config for our switch dist:

!Current Configuration:!System Description "PowerConnect 6248, 3.3.6.4, VxWorks 6.5"!System Software Version 3.3.6.4!Cut-through mode is configured as disabled!configurevlan databasevlan 5,10,15,20,25,50,100,150,200vlan routing 1 1vlan routing 5 2vlan routing 100 3exithostname "SW1-M01"sntp unicast client enablesntp server 192.168.0.211clock summer-time recurring USA zone "CDT"clock timezone -6 minutes 0 zone "CST"stackmember 1 2exitip address 192.168.150.250 255.255.255.0ip address vlan 150ip domain-name ***ip name-server 192.168.0.211ip name-server 192.168.0.212logging 192.168.0.128level warningexitip routingip route 0.0.0.0 0.0.0.0 192.168.0.253interface vlan 1routingip address 192.168.0.254 255.255.255.0exitinterface vlan 5name "Dev_VLAN"routingip address 192.168.10.254 255.255.255.0exitinterface vlan 25name "DSL_VLAN"exitinterface vlan 100name "Voice_VLAN"routingip address 10.116.116.2 255.255.252.0exitinterface vlan 150name "Management_VLAN"exitusername "admin" password ---- level 15 encryptedvoice vlanline telnetexec-timeout 1800exitip ssh serverspanning-tree priority 4096!interface ethernet 1/g1channel-group 1 mode autodescription 'SWI-M02_Uplink'lldp transmit-tlv port-desc sys-name sys-desc sys-caplldp transmit-mgmtlldp notificationlldp med confignotificationlldp med transmit-tlv locationlldp med transmit-tlv inventoryexit!interface ethernet 1/g2channel-group 1 mode autodescription 'SWI-M02_Uplink'lldp transmit-tlv port-desc sys-name sys-desc sys-caplldp transmit-mgmtlldp notificationlldp med confignotificationlldp med transmit-tlv locationlldp med transmit-tlv inventoryexit-- snipped due to length --
Thanks!

I've been searching through your configuration and try to spot something that may be the cause, but nothing is really jumping on me.

On the phones they have workstations that connect to their internet access? Or is it just the phone itself?

One thing we can look at the practice enables jumbo frames. Jumbo frame can be let through all ports and the switch will still go from regular sizes. Extended frames must be activate through all the connections at both ends, once activate on the LAG on a switch, you need to activate on another LAG switch also pass to the back.

Console (config) # interface range ethernet 1/g1-1/g48

Console (Config-if) #mtu 9216

Console (Config-if) #exit

Console (config) # interface ethernet port-channel 1

Console (Config-if) #MTU 9216

Console (Config-if) #exit

Make sure that you back up the configuration in the startup-config on the switch.

That a try and see if there is a change in behavior.

Thank you.

Tags: Dell Switches

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