Reduced Bandwidth on Cisco 3550

[pbxnkey]

I upgraded my cable connection to 200mbps. I have an ASA5506x with a 3550 switch. When I connect a PC or laptop direct to an ASA port I get full 200mbps. But when I connect to one of the ports on the 3550 may speed gets reduced to only 100mbps. I tried changing the speed/duplex with no luck. Has anyone aver come across this?
Thx

 

[iggsterman]

what is the exact model of your 3550? From the sound of this you may have a 10/100 switch.

 

[pbxnkey]

I'd have to check but I know for a fact that all but the last 2 ports are 10/100. Last 2 are for gbic that can support 10/100/1000.

 

[iggsterman]

So you probably have a 10/100 switch.

 

[pbxnkey]

Yep. I assumed the issue was because it was only 10/100 and not gigabit but wasn't sure. I did however configure LAG ports thinking bundling 2 ports on both the ASA and switch would give me 200mbps but I still only got 100mbps throughput.
I'll have to test with a gig switch.

 

[iggsterman]

bonding will not give 200m from a single session as the bandwidth of of a single flow over a LAG is limited to that of the physical link.

 

[ADB100]

There were seven varients of the Catalyst 3550 switch:

· Catalyst 3550-24 Switch—24 10/100 ports and two Gigabit Interface Converter (GBIC)-based Gigabit Ethernet ports; 1 rack unit (RU)
· Catalyst 3550-24 PWR Switch—24 10/100 ports with integrated inline power and two GBIC-based Gigabit Ethernet ports; 1 RU
· Catalyst 3550-24-DC Switch—24 10/100 ports and two GBIC-based Gigabit Ethernet ports; 1 RU; DC-powered
· Catalyst 3550-24-FX Switch—24 100FX ports and two GBIC-based Gigabit Ethernet ports; 1 RU
· Catalyst 3550-48 Switch—48 10/100 ports and two GBIC-based Gigabit Ethernet ports; 1 RU
· Catalyst 3550-12G Switch—10 GBIC-based Gigabit Ethernet ports and two 10/100/1000BASE-T ports; 1.5 RU
· Catalyst 3550-12T Switch—10 10/100/1000BASE-T ports and two GBIC-based Gigabit Ethernet ports; 1.5 RU

All featured two modular GBIC-based Gigabit Ethernet uplinks except the 3550-12G which has 10 GBIC ports and two 10/100/1000BaseT Ethernet ports. Unless you have the 3550-12T or are connecting both the ASA5506-X and the PC to the Gigabit Ethernet ports then you won't get any more than 100Mbps as the physical interface you are connecting the PC to only runs at 100Mbps.
If you really need a Cisco Catalyst switch with 1Gbps copper ports then you will need to upgrade to a 3560G/3750G (EoL as well) or a 2960S/X or even 3650/3850. It depends on your requirements..

Andy