> From: Luis Balbinot <[email protected]> > Sent: Monday, January 28, 2019 1:39 PM > > I have many LSPs from P1 to P4 and all have FRR protection (Juniper FRR, 1:1). > Even with two distinct paths from P1 to P4 (both with much lower IGP > metrics) I get some detour LSPs setup on PE1. PE1 is a low-end ACX5k with > very limited transit capabilities and I definitely don't want any transit > traffic > through it. > > I could color the green links and call them "p-pe" for example but I can't > just > exclude all "p-pe" links from the FRR selection. If I setup an LSP from P1 to > PE1 the CSPF path will be P1->P2->PE1 and I'll need the P1->P2->P3->PE1 > path for protection, but that can't be setup because it has a "p-pe" member > in the path. > > P2->PE1 and P3->PE1 share the same fate as P2->P3, but even with SRLG > it is not guaranteed that LSPs won't be setup over the PE1 circuits. > I think what could be done in this topology is to mark the P2-PE1 and P3-PE1 links with special colour (say green for the sake of this example). 1) Now as for the RSVP-TE signalled LSPs between P routers (e.g. between P1 and P4) Those would be set up to exclude green colour when signalling their detour LSPs. [edit protocols mpls label-switched-path LSP_P1_TO_P4] set fast-reroute exclude GREEN 2) only LSPs to PE1 will have no such constrain configured for their detour LSPS. And thus will be able to use the P2-PE1 and P3-PE1 links in order to protect the last leg of the path towards PE1
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