[c-nsp] Ip unnumbered on 3750

[Tassos Chatzithomaoglou]

According to http://www.cisco.com/en/US/tech/tk648/tk362/technologies_tech_note09186a0080094e8d.shtml:
"remember that the ip unnumbered command works on point-to-point interfaces only"

On latest IOS it works on ethernet subifs too. So the above statement is not totally correct


In your case, it's strange that 3560 accepts it, while 3750 rejects it.
Are they using the same IOS?

Under 12.2(44)SE2, it gets accepted, but you get the following warning:

Warning: dynamic routing protocols will not work on non-point-to-point interfaces with IP unnumbered configured.


--
Tassos

Wyatt Mattias Gyllenvarg wrote on 10/11/2008 10:55:
> Hi All
> 
> I was playing around with an ip unnumbered config for our Dist-layer.
> 
> I got a working config on a 3560 ie
> 
> int loopback 10
> ip address x.x.x.x y.y.y.y
> 
> Vlan x
> ip unnumbered loopback 10
> 
> Vlan x1
> ip unnumbered loopback 10
> 
> Vlan x2
> ip unnumbered loopback 10
> 
> The same wont work on 3750 which gives the following when inputing the
> "ip unnumbered" command.
> 
> Point-to-point (non-multi-access) interfaces only
> 
> My question is, is there a work around for this or will 3750 never
> support "ip unnumbered" on multi-access interfaces?
> 
> Best regards
> Mattias Gyllenvarg
> Omnitron
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