IOS with netmask

[aksher]

which IOS supports netmask 255.255.255.254

[phil.davenport]

I presume you are talking about using 31-bit prefixes on IPv4 point-to-point links.

Use the Cisco Feature Navigator and search by feature.

http://tools.cisco.com/ITDIT/CFN/jsp/index.jsp

The feature you want to look for is 'Using 31-bit Prefixes on IPv4 Point-to-Point Links' You can then start to filter down to find your exact image

HTH

--Phil

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[Marvin Rhoads]

The feature was introduced in 12.2(2)T and mainlined in 12.2(28)SB. See the feature guide for 12.2T: http://www.cisco.com/en/US/products/sw/iosswrel/ps1839/products_feature_guide09186a0080087aeb.html

Hope this helps, please rate helpful posts.