1721 IOS with ISL support

[andris.zarins]

I'm looking for an up-to-date IOS image for 1721 with ISL support. So far I have tried about 10 images, but none of them lets me configure 'encapsulation isl' on ethernet subinterface. Any ideas ? Filename or IOS name would be just great. That box has 96 RAM and 16 flash.

[ccotech00]

Hi ,i had the same issue with a cisco 1721 ,i ended up having to use dot1q encap. My router is running 12.3 but still no ISL ,pretty strange ,considering that ISL is Cisco proprietary.

[amit-singh]

Hi,

Sorry to say but 1721 doesnot support ISL trunking. The chipset which in the router doesnot support ISl trunking, only dot1q is supported.

Please see the following links

http://www.cisco.com/en/US/partner/products/hw/routers/ps221/products_qanda_item09186a00800927e6.shtml#45897

http://www.cisco.com/en/US/partner/products/sw/iosswrel/ps5413/prod_release_note09186a00801c46b3.html#wp120470

HTH,

-amit singh