Excessive Trunk port utilization

[Recep MURAT]

hello.

i use 3550, 3560 and 6500 switches

.

connected as follows

6500(backbone sw)-----trunk------3550sw-----trunk-----3560--------trunk------3560

and my question.

3550---trunk--3560---trunk--3560

utilization:

#show controllers utilization

these trunk port utilization 80% or  90%

but 6500(backbone sw)----trunk----3500

utilization:

#show controllers utilization

these trunk port utilization 6% or  10%

When systems use a port other users trying to slow or freezes.

what is my problem or problems??

thank you

[Mathias Garcia]

Are all links gigabit? Or are some 100mbit?

Not knowing what are connected to the 3550/3560 switches and how their traffic patters are I cant say why you have the high link utilization. (unless its the 1000mbit->100mbit bottleneck.)

But 80-90% on ethernet is fairly high. If thats your average I would really think that you would have times when your queues are full and dropped packets for it. Due to the bursty nature of ethernet.

What are the CPU utilization on the 3550/3560? Are they doing Layer3 or just Layer2?

[Ganesh Hariharan]

hello.
i use 3550, 3560 and 6500 switches
.
connected as follows
6500(backbone sw)-----trunk------3550sw-----trunk-----3560--------trunk------3560
and my question.
3550---trunk--3560---trunk--3560
utilization:
#show controllers utilization
these trunk port utilization 80% or  90%
but 6500(backbone sw)----trunk----3500
utilization:
#show controllers utilization
these trunk port utilization 6% or  10%
When systems use a port other users trying to slow or freezes.
what is my problem or problems??
thank you

Hi,

You need to deploy tools like sniffer to identify which host is creating a huge amount of traffic in your vlan and is choking the trunk links if you cannot do with sniffer stuff try removing vlans from trunk link one by one so that we can land at least in which vlans is genrating huge amount of traffic over the trunk.

Hope to Help !!

Ganesh.H

[Recep MURAT]

thanks for helping..

i resolved my problems today..

i removed vlans all of them and later added one by one..

these problems determined the cause rspan vlans.

and i remove that rspan vlan,

it is ok now..

best regards