CONNECT 100MBPS DEVICE TO 1GBPS SWITCH PORT CONGESTION

[abhijit_roy]

Hi Team,

           Kindly suggest regarding following practical case If I connect a p.c/laptop with 10/100 lan card capacity to a 1 gbps port switch port congestion/packet drop might happen???

My switch is X440G2-48p-10G4

Thanks in advance

[abhijit_roy]

is there any alternate way to find out exact error, means device end/switch end, as i have observed that apart from 10/100 to gbps, several times we faced port congestion issue even in 1 to 1 gbps, and in all the cases “show ports flow-control” and “show ports congestion” shows pause Rcvs as well as Packet drops, any commands or naything else

[Miguel-Angel_RO]

Roy,

The TCP stack should handle the packet losses resending the packets unacknowledged.

The UDP stack hasn’t acknowledge mechanism.

Is there some common questions in the article here?:

Mig

[abhijit_roy]

Thanks for your response, can u please explain following line it is not cleared to me,

“The TCP layer should be able to handle that. If you use UDP, packets are lost”

My use case as follows,

I have LAN Port of 1gbps each, for scarcity of port we have shared that port by using ip phone with one  connection to phone and other connection to p.c(ip phone have 2 lan ports), and that phone have 10/100 capacity of each port only, so voice+data both are routed to the 10/100 i guess, and i used “show ports congestion” to monitor packet drops, and found incremental counter, that’s why my confusion is is it due to 10/100 connected to 1 gbps port?? or something else for increasing packet drop counters.

Thanks

[Miguel-Angel_RO]

Roy,

It seems normal to me to have packet drops. The device on the other side is probably sending a data flow at Gbps speed.

The TCP layer should be able to handle that. If you use UDP, packets are lost.

If you want to releave it a little bit you can enable flow control on the port (if the X440G2 support it, I don’t know).

Mig