From: dheaton@c4.com.au
Date: Wed May 31 2006 - 01:01:22 ART
This is probably old news, but it might help someone - you need to cable both modules to be cabled together in order to use the second module.
Otherwise you'll get L2 UP, UP, CDP etc. but no IP /ping etc.
Q. Can I stack two Cisco EtherSwitch HWICs in a chassis without connecting the Fast Ethernet ports?
A. No, stacking without connecting the two Fast Ethernet interfaces is not supported. Connecting the two Fast Ethernet interfaces and using the stacking-partner command eliminates conflicts in the VLAN databases between the two HWICs.
Installing two HWICs without this connection results in duplications in the VLAN databases and is not a supported configuration.
http://www.cisco.com/en/US/products/ps5855/products_qanda_item0900aecd8016c026.shtml
Stacking example:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123newft/123t/123t_8/esw_cfg.htm#wp1051409
So if you stack 2 x 4ESW modules, you have 6 useable ports - obviously get a 9 or 16 port module instead !!
There are other limitations of the VLAN interfaces as well:
http://www.cisco.com/en/US/partner/products/ps5855/products_qanda_item0900aecd8016c026.shtml
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