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[sajin9231]

Hi

I use a C3750 as my core switch where I have configured all the vlans for my office. We have a 100 Mbps link for Internet but I notice that the speed is only nearly half from user side. The 100 Mbps link is connected to a firewall to which the switch is connected. In order to make sure this is not an ISP issue, I connected a laptop directly to the firewall and got a speed more than 90 Mbps. So it's definitely not an ISP issue. Attached is the configuration of my switch. I'm not able to find out where the configuration is wrong. Any assistance would be appreciated.

[paul driver]

Hello

can you check on your stp - make sure this switch stack is the stp root

sh version | in Base. <—--check the base Mac-address 

show spanning-tree root 

config t

spanning-tree vlan 1-4092 priority 0

[sajin9231]

Hi Paul,

OMAHO_LAN_CORESW1#    sh version | in Base
Base ethernet MAC Address       : FC:5B:39:59:6E:80
Base ethernet MAC Address       : BC:16:F5:C4:EA:00

OMAHO_LAN_CORESW1#show spanning-tree root

                                        Root    Hello Max Fwd
Vlan                   Root ID          Cost    Time  Age Dly  Root Port
---------------- -------------------- --------- ----- --- ---  ------------
VLAN0001             1 fc5b.3959.6e80         0    2   20  15
VLAN0030            30 fc5b.3959.6e80         0    2   20  15
VLAN0031            31 fc5b.3959.6e80         0    2   20  15
VLAN0032            32 fc5b.3959.6e80         0    2   20  15
VLAN0033            33 fc5b.3959.6e80         0    2   20  15
VLAN0034            34 fc5b.3959.6e80         0    2   20  15
VLAN0035            35 fc5b.3959.6e80         0    2   20  15
VLAN0036            36 fc5b.3959.6e80         0    2   20  15
VLAN0040            40 fc5b.3959.6e80         0    2   20  15
VLAN0050            50 fc5b.3959.6e80         0    2   20  15
VLAN0100           100 fc5b.3959.6e80         0    2   20  15
VLAN0192           192 fc5b.3959.6e80         0    2   20  15

The improvement I mentioned earlier was only minor. Earlier it used to peak at around 50 Mbps, now it goes up to 60Mbps.

[sajin9231]

Hi Paul,

I am attaching the configuration of the switch which was taken from CNA. Hope this gives some more insight on the issue.

[balaji.bandi]

just gone lost here in thread. so your switch is not root bridge here..and you have core switch act as root bridge for the vlans.

Can you pleae confirm how is your setup

user --(Access switch)--Core switch0-- FW --internet

where Access switch you are not getting expected speed is this correct ?

[sajin9231]

Hi Balaji,

You are right. This is the flow.

user --(Access switch)--Core switch0-- FW --internet

I directly connected to the Core Switch as suggested but the issue was still there.

So speed issue is not just from the Access switch.

[balaji.bandi]

So the problem still the same if you connect to core Swtch also.

So the problem now in core switch - so lets start working on core switch, then move to next level of network.

when you mentioned last conversation, you could able to get more good throughput when you connected to FW.

doe this mean you connect to FW port and tested ? or connected to switch port and tested.

core_CNA (is your core switch config),  please confirme so let review that config.

[sajin9231]

Hi,

I connected directly to the Firewall port and tested. No switch in between.

Yes, CORESW1 - CNA is the configuration of Core Switch.

[Georg Pauwen]

Hello,

I just remembered another thread with a similar issue. That was resolved by downgrading the IOS to release 12.2.55-SE12 MD. If you run out of ideas, you might want to give that a try...

[sajin9231]

Hi Georg,

I took another C3750 switch with 12.2(58)SE2 IOS and restored the current configuration into that. I added another VLAN and tested with a laptop. There was no change. In fast.com, the speed showed only 4.5 Mbps.

[Georg Pauwen]

Hello,

I am just thinking you might be running into the L3 throughput limit, which is somewhere around 65Mbps for the 3750E 24 port switch...

Check the data sheet attached (not sure if that is still current though):

https://www.cisco.com/web/partners/downloads/765/tools/quickreference/switchperformance.pdf

[sajin9231]

Hi,

So 6,500,000 Mpps is 65 Mbps?

Also I have changed the configuration to use SVI instead of routed port. Attaching the new configuration for your review.

[Georg Pauwen]

What throughput do you get when you connect two clients on that same switch through a Layer 3 connection ?

interface GigabitEthernt1/0/5

description PC1

switchport access vlan 33

spanning-tree portfast

!

interface GigabitEthernt1/0/6

description PC2

switchport access vlan 34

spanning-tree portfast

[paul driver]

Hello

Can you confirm with what configuration you are running with, you have now posted completely 3 different config versions.

[sajin9231]

Hi Paul,

CORESW1 - new (1).txt is the latest configuration after you had asked to configure SVI instead of routed port.

[sajin9231]

Hi Georg,

Both the clients are giving the same speed.