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/31 netmask


hi 

 

i am trying to configure a /31 address in VSP 7400 rel 8.6 but always gives error.

“brouter port 1/54 vlan XXXX subnet XXX.YYY.ZZZ.153 255.255.255.254”

 “port 1/54, Invalid IP address”

 

is this possible or not on VSP?

 

thanks in adv

Antero

 

 

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Best answer by Ludovico Stevens 21 July 2021, 12:09

31 bit masks are not supported with VOSS. You’ll need to allocate a 30 bit mask.

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Userlevel 5

31 bit masks are not supported with VOSS. You’ll need to allocate a 30 bit mask.

31 bit masks are not supported with VOSS. You’ll need to allocate a 30 bit mask.

 

that is a very bad news.

do you know when it will be available? 

 

for interconnecting with ISP with BGP this is a huge problem.

 

thanks

Antero Vasconcelos

 

Userlevel 5

31 bit masks are not supported with VOSS. You’ll need to allocate a 30 bit mask.

 

that is a very bad news.

 

 

 

FYI…..

31 bit network masks as specified by RFC3021 is not an internet standard.   https://datatracker.ietf.org/doc/html/rfc3021   It is only a “proposed standard”.

Userlevel 5

You might be able to swing it this way..

If the WAN IP address ends in 01 or 10 binary, then simply create the VSP IP ending with 10 or 01 binary (the other way round) but using a /30 mask.

If the WAN IP address ends in 00 or 11 binary, then it’s more fiddly..!

 

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