I am also looking at FRR which uses a backup tunnel for fast convergence. I did however not think about the dynamic nature of the tunnel and the potential for reestablishment.
Mike On Fri, Nov 4, 2011 at 12:49 PM, Vitkovsky, Adam <avitkov...@emea.att.com>wrote: > Hello Mike, > What exactly do you mean by primary and backup please? > As the tunnel "mpls traffic-eng priority" cmd simply only specifies the > setup and hold priorities > (you'd use those when there are tunnels carrying low priority traffic > filling up the available TE BW -and you need to setup a tunnel carrying > voice through that link -because the primary link failed -the higher setup > priority of the voice tunnel would knock down some of the scavenger tunnels > with lower hold priority) > > Now I'm not sure but I guess you can't have one tunnel act as backup for a > specific te-tunnel > Though you can configure a te-tunnel to act as a backup for a link > > Since one of your tunnels is dynamic it can be re-established around the > failed link > > Though which tunnel is going to be used to forward traffic is based on how > you instruct the trafic to use one of the tunnes as primary path > > > adam > > > -----Original Message----- > From: harbor235 [mailto:harbor...@gmail.com] > Sent: Friday, November 04, 2011 5:10 PM > To: NANOG list > Subject: MPLS TE > > TE lab testing flushing out how TE works, configured a primary and backup > tunnel between PEs, both directions. > Primary is dynamic and backup is explicit, initially priorities were the > same, I then choose > to make one tunnel preferred over the other adjusting the priorities, I > choose the tunnel that was backup > to become primary to watch the traffic shift. (primary path was P1-P2-P3, > backup path P1-P3). However, > the traffic did not shift, a manual shut on a P3-P2 interface made the > traffic shift, reintroduction > kept the traffic on P1-P3, then a "mpls traffic reoptimize" moved the > traffic back to P1-P2-P3. > > Obviously the preferred MPLS tunnel is still P1-P2-P3 even though I > configured "tunnel mpls traffic-eng priority 1 1" > on P1-P3 and "tunnel mpls traffic-eng priority 7 7" on P1-P2-P3. What am I > missing here? > > > My setup: > > > > CE-----PE-----P1----------P3-------PE----CE > \ / > \ / > P2 > > > Mike >
