I have a c2600 router with System image file is "flash:c2600-i-mz.123-24.bin running, i'm trying to configure subinterfaces on the device however the device doesn't give me the option to enter the encapsulation or ISL commands hence i can't configure an IP address to the sub-int any suggestion would be greatly appreciated.
Your current image is very basic and does not have IEEE 802.1Q VLAN Support
Edit: BTW, the image above requires 16MB flash. If your router only has 8MB flash, I'm afraid you are out of luck. I searched even on the 12.2T (when this feature was introduced) and if you want trunking support, you need 16MB flash.
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