10-26-2023 02:22 AM
Hi all
I have some problem on my switch
I have Topology like this :
CoreSW ---> MainSW ---> WLC5520 -- APs ---> Client
and when my switch got this packet excess defer frames
and this Output Drops
I have no Internet Access on my APs
maybe someone can explain me why this happend on my switch
thankyou
Solved! Go to Solution.
10-26-2023 02:40 PM
@Mr dum wrote:
And I used 1Gbps Sfp
Is it the problem?
A 5520 with a single 1 Gbps back to the network? Yes, I smell the problem right there.
A single 1 Gbps might be OK for the "mini" controllers like the 2504/3504/9800-L but expect the switch to get overwhelmed from the traffic coming from the 5520.
10-26-2023 07:38 PM
thankyou @Leo Laohoo for your information
I will change my ethernet port to 10gig
is it solved the problem?
10-26-2023 02:49 AM - edited 10-26-2023 02:52 AM
@Mr dum wrote:
CoreSW ---> MainSW ---> WLC5520 -- APs ---> Client
That topology is so wrong in so many places.
The link from the switch to the WLC is only a single link? Not an Etherchannel? And it is on a 1 Gbps link?
10-26-2023 04:49 AM
I think real topologi like this
Uplink --- CoreSw (port24) --- wlc
CoreSw (port11)--- APs
Yes only single link
And I used 1Gbps Sfp
Is it the problem?
10-26-2023 02:40 PM
@Mr dum wrote:
And I used 1Gbps Sfp
Is it the problem?
A 5520 with a single 1 Gbps back to the network? Yes, I smell the problem right there.
A single 1 Gbps might be OK for the "mini" controllers like the 2504/3504/9800-L but expect the switch to get overwhelmed from the traffic coming from the 5520.
10-26-2023 07:38 PM
thankyou @Leo Laohoo for your information
I will change my ethernet port to 10gig
is it solved the problem?
10-26-2023 08:04 PM
Although I fully agree with @Leo Laohoo that a 5520 WLC can be limited by a single gig link, unclear how inadequate bandwidth would just preclude wireless Internet access. Unless wireless only provides Internet access? If, that's the case, insufficient bandwidth usually doesn't cause "no access", but degraded service, to various degrees.
Regardless, if you can easily migrate to 10g, that's still a good recommendation, and if it actually solves your issue (which we don't yet know, correct?), it's a great recommendation. Please let us know actual result.
10-26-2023 05:08 AM
I'm puzzled by your Excess Defer frames. Cisco documentation on that stat, that I found, explains little. Further, my impression was it had meaning under half duplex. With full duplex seems to imply hardware cannot keep up with load.
In any case, your posted stats show a busy interface.
What's the IOS and hardware specifics?
As to why no wireless Internet access, we would need much, much more information.
10-26-2023 07:46 PM
My ethernet run on Full duplex
and you can see that's my WLC Spesification
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