[c-nsp] IP unnumbered vlan subinterfaces question

[Ivan Pepelnjak]

OSPF does not work across unnumbered VLAN subinterfaces.

http://wiki.nil.com/Unnumbered_Ethernet_VLAN_interfaces#Limitations

Ivan
 
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> -----Original Message-----
> From: Michael Ulitskiy [mailto:mulitskiy at acedsl.com] 
> Sent: Monday, August 03, 2009 5:10 PM
> To: cisco-nsp at puck.nether.net
> Subject: [c-nsp] IP unnumbered vlan subinterfaces question
> 
> Hello,
> 
> Guys, are there any drawbacks of doing the following:
> 
> interface Lo0
>  ip address 10.10.10.1 255.255.255.0
> !
> interface FastEthernet0/0.1
>  encapsulation dot1q 1 native
>  ip unnumbered Lo0
> !
> ip route 10.10.10.0 255.255.255.0 FastEthernet0/0.1 !
> 
> as opposed to having ip address configured directly on the 
> interface as usual?
> I need that ip address to stay always up regardless of Fa0/0 
> state, 'cause it's used for other services that should stay 
> up and I'd prefer to avoid assigning another ip address 
> exclusively for loopback use.
> It seems to work in my lab, but I thought I'd better ask...
> 
> Thanks,
> Michael
> 
>