"EtherChannel bundles can consist of up to eight physical ports of the same Ethernet media type and speed." - CCNP BCMSN Exam Certification Guide 3rd Ed. p.184 by David Hucaby
Perhaps you could create two seperate EtherChannels: one fiber, one copper. You could then enable load balancing across both EtherChannels or tweak your Spanning Tree settings to allow you to specify which one is forwarding.
When tou configure the Etherchannel, the traffic will be load-sharing through those channelled links and not active-standby stage. If you require active-standby, you may need to enable L3 routing for it.
in addition to the other posts, just be aware that with Etherchannel, the participating member links are actually not used equally. The default load balancing mode is src-mac (source MAC). To give you an example, if you have many users accessing the same server, with the default load balancing mode being source MAC, all traffic would go through one of the member links. In an situation like this, you might want to change the default to e.g. destination MAC, using the command:
port-channel load-balance dst-mac
You can see the actual utilization of the member links with the command 'show etherchannel load-balance'...
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