Subject: AW: AW: ifStackTable layering in L2TP

From: Klausberger Walter <[email-masked]>
Date: Tue, 9 Jan 2001 11:24:10 +0100

Thanks for the clarification. So, 'maybe routed over' refers to things like
multipath. Dynamic route changes due to routing protocols can change the
ifStackTable entries.
 
Walter

-----Ursprüngliche Nachricht-----
Von: Dave Thaler [mailto:[email-masked]]
Gesendet am: Dienstag, 09. Jänner 2001 01:06
An: Klausberger Walter; Evan Caves 
Cc: [email-masked]; [email-masked]
Betreff: RE: AW: ifStackTable layering in L2TP

I just got back from 3 weeks vacation and so have lost a
bit of context but...

>In the multipath example, the tunnel would be layered over ALL 
>the interfaces which have potential routes over them.  In this 
>sense, it's very analogous to multilink PPP, among other 
>things. 

Dave, do I understand it correct that regardless of the routing entry a
tunnel IF should sit on all possible interfaces it may be routed over? That
would also be a new aspect to me.  

Depends on how you define "may be routed over".
If you mean "at the current point in time, some packet may be sent over",
then yes.
For example, if the current state is such that packets may (according to
some
criteria) be encapsulated and sent over either of two interfaces, due to the
presence of two equal cost routes to the remote tunnel endpoint, and
multipath routing being enabled, then yes two entries would show up
in the (conceptual) ifStackTable, with the tunnel being over both of
the other interfaces.  
 
It doesn't mean "may be routed over at some future time", which
could be any interface, if one had a dynamic routing protocol
running.  
 
-Dave