https://community.extremenetworks.com/t5/extremeswitching-other/are-the-l3-extreme-switches-compatible-with-variable-length/m-p/9009#M37 Are the L3 extreme switches compatible with Variable Length Subnet Masking (VLSM)? Fri, 17 Nov 2017 00:41:00 GMT Obernan_Cavalca 2017-11-17T00:41:00Z https://community.extremenetworks.com/t5/extremeswitching-other/are-the-l3-extreme-switches-compatible-with-variable-length/m-p/9009#M37 Are the L3 extreme switches compatible with Variable Length Subnet Masking (VLSM)? Fri, 17 Nov 2017 00:41:00 GMT https://community.extremenetworks.com/t5/extremeswitching-other/are-the-l3-extreme-switches-compatible-with-variable-length/m-p/9009#M37 Obernan_Cavalca 2017-11-17T00:41:00Z https://community.extremenetworks.com/t5/extremeswitching-other/are-the-l3-extreme-switches-compatible-with-variable-length/m-p/9010#M38 Yes, you can use standard CIDR notation (eg, 10.0.20.1/23) when configuring IP addresses on the switch.. Fri, 17 Nov 2017 00:55:00 GMT https://community.extremenetworks.com/t5/extremeswitching-other/are-the-l3-extreme-switches-compatible-with-variable-length/m-p/9010#M38 BrandonC 2017-11-17T00:55:00Z https://community.extremenetworks.com/t5/extremeswitching-other/are-the-l3-extreme-switches-compatible-with-variable-length/m-p/9011#M39 Ok, thanks for reply.<BR /> Fri, 17 Nov 2017 00:55:00 GMT https://community.extremenetworks.com/t5/extremeswitching-other/are-the-l3-extreme-switches-compatible-with-variable-length/m-p/9011#M39 Obernan_Cavalca 2017-11-17T00:55:00Z https://community.extremenetworks.com/t5/extremeswitching-other/are-the-l3-extreme-switches-compatible-with-variable-length/m-p/9012#M40 Hi,<BR /> <BR /> the VLSM idea is from times back when classful IP routing was used. Old routing protocols did not send a subnet mask with the network address. But all modern routing protocols (including RIPv2 which is not really modern) include a network mask (or prefix length) and fully support CIDR (classless inter-domain routing) which includes all the features associated with VLSM (variable length subnet masks).<BR /> <BR /> Extreme switches and routing protocols support classless IP routing by default.<BR /> <BR /> Thanks,<BR /> Erik Fri, 17 Nov 2017 16:32:00 GMT https://community.extremenetworks.com/t5/extremeswitching-other/are-the-l3-extreme-switches-compatible-with-variable-length/m-p/9012#M40 Erik_Auerswald 2017-11-17T16:32:00Z https://community.extremenetworks.com/t5/extremeswitching-other/are-the-l3-extreme-switches-compatible-with-variable-length/m-p/9013#M41 Ok, very thanks for explanation.<BR /> Fri, 17 Nov 2017 16:32:00 GMT https://community.extremenetworks.com/t5/extremeswitching-other/are-the-l3-extreme-switches-compatible-with-variable-length/m-p/9013#M41 Obernan_Cavalca 2017-11-17T16:32:00Z