Is there a way to find out about my neighbors subnet mask?
when i issue the command:
>show cdp neighbors detail
i get an ip address but not the mask.
is there any way to find it using cdp?
(suppose i have a router that is connected to a switch but i cant access that switch - only through cdp. and i need to configure the routers address for the interface which connects to the switch - how do i do that if i cant see the mask?)
If you know the switch IP from CDP, just apply the switch IP + 1 on the router interface.
For instance if the switch IP is 192.168.1.1, assign the router 192.168.1.2 - test with ping and then attempt to telnet.
The subnet mask need not to match. Ideally, all devices in a subnet must have the same subnet mask so they can agree on their broadcast domain but you can have a device with 255.255.255.240 and another device with 255.255.255.0. The first device will limit its broadcast domain to 14 hosts while the second device will have its broadcast domain composed of 254.
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