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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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Enabling sFlow Max-Header Size Extended

To configure the maximum header size of a packet to 256 bytes, use the following commands:

  • Set the maximum header size of a packet. CONFIGURATION mode INTERFACE mode sflow max-header-size extended By default, the maximum header size of a packet is 128 bytes. If the traffic ingresses on an sFlow enabled interface, 256 bytes are copied.
  • To reset the maximum header size of a packet, use the following command [no] sflow max-header-size extended
  • View the maximum header size of a packet. show running-config sflow

Example of Viewing the Extended Max Header Size

Dell#show sflow interface tengigabitethernet 1/1
                                    Te 1/1
                                    sFlow type                       :Ingress   <<<<
                                    Configured sampling rate         :16384
                                    Actual sampling rate             :16384
                                    Counter polling interval         :20
                                    
                                    Extended max header size         :256
                                       
                                    Samples rcvd from h/w            :0
                                    
                                 

Example of the show sflow command

The bold line shows the sFlow default maximum header size:

Dell#show sflow
                                 sFlow services are enabled
                                 Egress Management Interface sFlow services are disabled
                                 
                                 Global default sampling rate: 32768
                                    
                                 Global default counter polling interval: 20
                                 
                                 Global default extended maximum header size: 128 bytes
                                    
                                 Global extended information enabled: none
                                 1 collectors configured
                                 Collector IP addr: 100.1.1.1, Agent IP addr: 1.1.1.2, UDP port: 6343 VRF: Default
                                 0 UDP packets exported
                                 0 UDP packets dropped
                                 0 sFlow samples collected
                                 
                                 stack-unit 0 Port set 0
                                 Te 1/1: configured rate 16384, actual rate 16384   <<< sampling rate based on line speed if global sampling rate is default
                                 Dell#
                              

Example of Viewing the sFlow max-header-size extended on an Interface Mode

If you enable sFlow on an interface, the show output displays the following (shown in bold).

Dell(conf-if-te-1/10)#show sflow
                                 sFlow services are enabled
                                 Egress Management Interface sFlow services are disabled
                                 Global default sampling rate: 32768
                                 Global default counter polling interval: 86400
                                 
                                 Global default extended maximum header size: 256 bytes
                                    
                                 Global extended information enabled: none
                                 1 collectors configured
                                 Collector IP addr: 100.1.1.12, Agent IP addr: 100.1.1.1, UDP port: 6343 VRF: Default
                                 0 UDP packets exported
                                 0 UDP packets dropped
                                 0 sFlow samples collected
                                 
                              

Example of the show running-config sflow Command

Dell#show running-config sflow
                                 !
                                 sflow collector 100.1.1.12 agent-addr 100.1.1.1
                                 sflow enable
                                 sflow max-header-size extended
                                 
                                 
                                 Dell#show run int tengigabitEthernet 1/10
                                 !
                                 interface TenGigabitEthernet 1/10
                                 no ip address
                                 switchport
                                 sflow ingress-enable
                                 sflow max-header-size extended
                                 no shutdown
                                 
                              

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