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Home > Archive > CCNA > February 2003 > ip subnet-zero
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| Townsend 2003-02-23, 4:17 pm |
| What does it mean when it says ip subnet-zero in the show startup-config? | |
| larkspur 2003-02-23, 9:34 pm |
| You have not configed your ip stack yet. | |
| gcw123 2003-02-23, 11:22 pm |
| If a network address is subnetted, the first subnet obtained after subnetting the network address is called subnet zero. | |
| deadfred 2003-02-24, 5:40 am |
| I found this at the following link:
http://www.certifiednow.com/frame_relay.htm
ip subnet-zero
When subnetting an IP network, the all zeroes subnet and the all ones subnet are normally discarded as invalid. This command allows the router to recognize the zero subnet range as a valid range of addresses. This command is not necessary if the network is not subnetted, although it does not hurt to include the command in the configuration. For instance, if a router is configured with the address of 206.1.1.1 255.255.255.192 without including the ip subnet-zero command, the error "Bad mask /26 for address 206.1.1.1" would be displayed because 206.1.1.1 is part of the zero subnet.
Hope this helps. | |
| Townsend 2003-02-24, 4:24 pm |
| So that command makes subnet zero usable. Thanks that does help! |
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