Is anyone using a /31 mask on point to point links or uplinks between layer 3 switches? Is there any downside or gotchas? I'm planning on running layer 3 all the way to my access switches and using routed ports to connect the access to the distribution. A /31 mask would help conserve ip addresses, right?
To the best of my knowledge a /31 netmask is not possible.
The smallest subnet possible is a /30 which yields 2 usable IP addresses along with the broadcast address of the subnet and the subnet number. This is what is recommended for a point to point link.
I think I remember reading somewhere about an RFC that was in the experimental stage which would allow a /31 mask (though I may be dreaming), but I have never heard of it being released for use.
I have seen instances where errors were made in configurations and either the subnet mask or the subnet number was assigned to a host and it appeared to work, but I think that this would be frowned upon in a live production network.
thanks everyone for letting me know what you think. I'm going to try the /31 in a test environment and see if I like it. I am on a lan and do have plenty of addresses and of course, we're an all Cisco shop, so interoperability won't be a problem.
Question We run asr9001 with XR 6.1.3, and we have a very long delay to
login w/ SSH 1 or 2 to the device compare to IOS device. After
investigation, the there is 1s delay between the client KEXDH_INIT and
the server (XR) KEXDH_REPLY. After debug ssh serv...
Introduction The purpose of this document is to demonstrate the Open
Shortest Path First (OSPF) behavior when the V-bit (Virtual-link bit) is
present in a non-backbone area. The V-bit is signaled in Type-1 LSA only
if the router is the endpoint of one or ...
Hi, I am seeing quite a few issues with patch install and wanted to
share my experience and workaround to this. Login to admin via CLI, then
access root with the “shell” command Issue “df –h” and you’ll probably
see the following directory full or nearly ...