topic How many GLC-T I need for WLC5508 in Wireless

How many GLC-T I need for WLC5508

Frank_Cor — Mon, 05 Jul 2021 15:49:27 GMT

We currently have 4 GLC-T connecting to the WLC5508. However, I still feeling the wireless VLAN is a tab slow while we have all the users on. Do I need to add more GLC-T?

Currently environment:

1000-1500 devices connecting to 55 AP. AP are 35 3505E, 10 2702I.

Re: How many GLC-T I need for WLC5508

Sandeep Choudhary — Mon, 09 Jul 2018 06:30:43 GMT

5508 allows us to have eight SFP ports. So we can have a maximum of eight 1Gbps uplinks in an etherchannel(Combined 8 gigabit if you wanted.)

SFP supported on 5508: GLC-T, GLC-SX-MM, GLC-LH-SM

Regards

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Re: How many GLC-T I need for WLC5508

Frank_Cor — Mon, 09 Jul 2018 06:38:00 GMT

Thanks for your quick response. Just don't know whether this will improve our Wi-Fi performance. Since 5508 hardware wise can support up to 500 AP, I thought we would never use 8 uplinks. Can you point me to the right direction how to check if the physical interface is the limit.

Thanks,

Frank

Re: How many GLC-T I need for WLC5508

Leo Laohoo — Mon, 09 Jul 2018 06:42:00 GMT

@Frank_Cor wrote:

Currently environment:

1000-1500 devices connecting to 55 AP. AP are 35 3505E, 10 2702I.

I have several 5508 and I've got MORE APs and users than this. I've also gone through every firmware Cisco has published. The only time I've seen sluggish performance (GUI & CLI) was using 7.X.X.X firmware.

Re: How many GLC-T I need for WLC5508

Frank_Cor — Mon, 09 Jul 2018 06:51:45 GMT

Hi Leo,

How many SFP you have installed for those 5508? Have you used all 8 ports?

We have used 4 SFP ports and all use etherchannel on a 2960s switch that already reserved 8 ports for this WLC.

Thanks,

Frank

Re: How many GLC-T I need for WLC5508

Scott Fella — Mon, 09 Jul 2018 07:18:30 GMT

I really doubt that you need to add more. Have you checked how many clients are connecting on each AP or how many clients are connected via 2.4ghz vs 5ghz? That is where you should start first to reduce sluggishness.

Re: How many GLC-T I need for WLC5508

Leo Laohoo — Mon, 09 Jul 2018 07:23:48 GMT

@Frank_Cor wrote:

How many SFP you have installed for those 5508? Have you used all 8 ports?

I have two controllers with 4 GLC-T, two controllers with 2 GLC-T and four controllers with 8.

All ports are LAG.

Re: How many GLC-T I need for WLC5508

Frank_Cor — Tue, 17 Jul 2018 12:18:38 GMT

Sorry for the late reply. I believe I have found the issue. There is something to do with the core switch. I have made some changes and inter VLAN speed improved.

Re: How many GLC-T I need for WLC5508

Frank_Cor — Tue, 17 Jul 2018 12:22:26 GMT

I also cut down some 2.4GHz signal from some APs, I believe we have getting a bit less interference now. Thanks for the suggestion.