[nsp] using /31s

[Bruce Pinsky]

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Jeff wrote:

|>I'm missing a nugget of clue -
|>
|>edge2(config)#interface Serial6/0/4:0
|>edge2(config-if)#ip address 216.23.183.248 255.255.255.254
|>Bad mask /31 for address 216.23.183.248
|>edge2(config-if)#ip address 216.23.183.249 255.255.255.254
|>Bad mask /31 for address 216.23.183.249
|>edge2(config-if)#ip address 216.23.183.250 255.255.255.254
|>Bad mask /31 for address 216.23.183.250
|>edge2(config-if)#ip address 216.23.183.251 255.255.255.254
|>Bad mask /31 for address 216.23.183.251
|>
|>216.23.183.0/24 is VSLM'd but has mostly /30s.  I have essentially two /30s
|>left (216.23.183.248/30, 216.23.183.252/30) and figured I'd double that with
|>/31s but I'm having issues with IOS accepting it.
|
|
| I am not sure if you are being serious here, but a /31 is an invalid
| netmask.
|
| It will only give you the network and broadcast, no actually usable IP
| Addresses.
|

Sorry, but see RFC 3021 which is supported by cisco and several other
vendors to conserve address space on pt->pt links.  See:

ftp://ftp.rfc-editor.org/in-notes/rfc3021.txt
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122t/122t2/ft31addr.htm

- --
=========
bep

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