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Please help me prove Cisco switches can do anything

spejic
Level 1
Level 1

Dear Everyone:

Below is my setup, please see the attachment.

Basically I have two sets of wireless devices, 802.11a station and AP, and 802.11b station and AP.

Stations are connected to the Catalyst 2926, while the APs are connected to the 2924XL.

802.11a devices have 100Mbps NICs, while the 802.11b devices have 10Mbps NICs.

(Basically this is the same as if we connected the switches with two wires, and there was 10mbps and 100mbps link connecting the two switches; the only difference is the lack of wires between the switches).

What I am trying to accomplish is:

-100 mbps wireless bridges (station and AP) would act as the main connection, while the 10 mbps bridges (station and AP) would act as standby connection in case 100 mbps ones fail. (I would also like to keep them both up if it's possible; can these switches actually load-balance between 10 and 100 mbps links, if they can, how ?)

This is what I am getting when I do my testing:

My workstation is connected to the 2926, and the FTP server is connected to the 2924XL.

When I look at the spanning tree, all four ports (used by wireless bridges) are forwarding, but apparently only the 10 mbps ports are used. I know that because I get 600 kbps when I have both wireless bridges connected; when I disconnect the 10 mbps bridge, I get about 2 megs per second transfer rate. If I am to reconnect the 10 mbps connection, first my pings would time out, and then the 10 mbps connection would be used again. (frustrating !!!!! :(( )

From my writing, you can tell I am fairly clueless when it comes to switching. However, I need to finalize this project, so your suggestions will be greatly apprechiated !!

Thanks in advance,

Simon

1 Reply 1

milan.kulik
Level 10
Level 10

Hi,

if I understand correctly, both your wireless stations have to work as bridges, too.

The 802.11a (100Mbps) station has probably blocked one port to break the STP loop.

Check it.

If I'm correct, then it's necessary to check who is the STP root, too (use sh spantree ... command).

I'd guess it's one of the 802.11b devices, now.

So make your 2926XL the STP root (decrease it's STP priority by spanning-tree vlan x priority .... config command) and everything should work fine.

Regards,

Milan