A network engineer reports configuration and usability headaches implementing 6PE over an MPLS core on Nokia routers, noting complex RIB import policies and broken multipath load balancing.

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    "summary": "A network engineer reports configuration and usability headaches implementing 6PE over an MPLS core on Nokia routers, noting complex RIB import policies and broken multipath load balancing.",
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        "url": "https://www.reddit.com/r/networking/comments/1x87u2b/comment/phabl1t/",
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        "author": "rankinrez",
        "excerpt": "Thanks for sharing the experience.\n\n Did 6PE years back on a mixture of Cisco and Juniper. However we were generally happy with single best destination for any external prefix (small country), and didn’t do TE.",
        "posted_at": "2026-10-17T11:31:43.000Z",
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        "url": "https://www.reddit.com/r/networking/comments/1x87u2b/comment/phagu4q/",
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        "author": "Roshi88",
        "excerpt": "Why do you need to run rsvp for congestion control if you have sr?\n\n What's your igp? Are you using sros or sr-linux? I haven't configured 6PE on my 7750s but a good amount of sr/evpn. It's not the easiest config in general but their doc is pretty straightforward and it gives me a good amount of knobs to tweak. I don't think you can have an alternative to 6PE if you want your P routers to not spea",
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        "author": "DaryllSwer",
        "excerpt": "Nokia IIRC supports SR-MPLSv6. Why aren't you on SR-MPLSv6 already? Overlay iBGP handles everything else with RFC8950.",
        "posted_at": "2026-10-17T12:01:09.000Z",
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        "author": "Jackol1",
        "excerpt": "One option that many people are doing is just put the Internet (v4 and v6) into a dedicated VRF. Then all the usual TE and multipath options are available to you.",
        "posted_at": "2026-10-18T06:48:38.000Z",
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      "[post] But...on these Nokias it was a bit of a headache to get working. I thought it was a simple as enabling label-unicast in the neighbor config. It's a bit more.",
      "[post] It works now but I found that after this import, only one best path is imported. We use multipath to load balance but that wont work for ipv6 routes now.",
      "[post] So I don't think it was a very good experience configuring this on the Nokias. I belive it's much easier on other platforms."
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    "post_text": "My company is at the verge of turning up backbone links between our metros and we will run sr mpls. At a new site I had a chance to configure mpls so it's ready. All Nokia routers. IPv6 was a bit of an afterthought for me. We do have it on all interfaces, but nobody here wants to run Srv6. Would rather stay with the more mature mpls.\n\nWe could run dual stack ipv4 / ipv6, but im not sure if TE would be too difficult like that. We'll probably run rsvp for congestion control. I heard that it's better to run v6 over v4 mpls if you want this. And 6PE was an easy way to set that up. So I did that.\n\nBut...on these Nokias it was a bit of a headache to get working. I thought it was a simple as enabling label-unicast in the neighbor config. It's a bit more. Iad to adjust all the ibgp export policies for label-ipv6 also. Then, because SR holds separate RIB's for ipv6 and label-ipv6, I had to manually import routes between theories using import policies.\n\nIt works now but I found that after this import, only one best path is imported. We use multipath to load balance but that wont work for ipv6 routes now. You also have to do a special 'show route all' to see the imported best routes in the ipv6 RIB. They are hidden otherwise.\n\nSo I don't think it was a very good experience configuring this on the Nokias. I belive it's much easier on other platforms. But that could be another bring...",
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