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

[Miguel-Angel_RO]

Roy,

I would put QoS in place to ensure that voip has priority over the PC.

Whatever the switch/port/settings, the PC will always be in competition with the Phone.

Mig

[abhijit_roy]

I was thinking if i can isolate those ip phones to a separate sub-vlan and reduce the port speed of the switch(will be shared to a 10/100 16 ports normal switch) to 100 mbps, as my switch is 10/100/1000, am i thinking in correct way?

means if i use this command

configure ports 1 auto on speed 100 duplex full

[Miguel-Angel_RO]

Roy,

main reasons for packet drops are

1. wrong vlan configuration (dropping vlan packets not configured on both sides)
2. wrong subnet configuration (too big subnet for the type of traffic)
3. bandwidth congestion (QoS queuing incorrectly sized)
4. cabling issue
5. network attack or broadcast storm

A 100Mbps IP Phone with a PC connected on it will be very sensitive to all of this.

Mig

[abhijit_roy]

can u please brief possible reasons of packet drops apart from this speed mismatch. my environment is as follows.

single vlan in each switch with several sub-vlan+aruba wifi in network, with normal p.c+laptop in the end user, that’s it

and cables are are not faulty that’s i can say.