[Xorp-users] VLAN support in XORP

[Dan Lukes]

Pavlin Radoslavov napsal/wrote, On 09/26/07 11:01:
> The first-cut VLAN support is now committed in the CVS tree.
...
> In term of VLAN naming, the situation is the following.
> In FreeBSD (and I believe in other BSDs as well, but I haven't
> double-checked it yet), the vlan name has to be "vlan%d". However,
> the integer after "vlan" doesn't need to match the VLAN ID. E.g.,
> vlan10 could have VLAN ID of, say, 20.

	Unfortunately, no. It is "default" name, but the real interface name 
can be set to anything the administrator wish.

	On out network, the number after 'vlan' often match the VLAN ID. But I 
have interface named DEVILLAN also.

	You shall not derive any information about interface type nor 
underlying configuration from it's name.

	If you need specific information about a interface (as a type, VLAN ID 
or parent interface), you need to use os-specific routines to obtain it.

	By the way, configuration file shall contain configuration, not 
description of the OS that can be obtained from OS itself. 
Dis-synchronisation between real system configurations and it's 
description in xorp.conf is common source of problems.

	I mean - why I need to encode that interface vlan10 is virtual 
interface derived from parent fxp0 into xorp.conf ? It's information 
that can be extracted from OS (if you really need it), so it shall be 
extracted from OS, not from configuration file. The BSD make those 
informations available for application. I'm sure the Linux does it also 
as well.

					Dan



-- 
Dan Lukes                                               SISAL MFF UK
AKA: dan at obluda.cz, dan at freebsd.cz, dan at (kolej.)mff.cuni.cz