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Michal 5ed0e4888a
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labsim: both matrices green end to end, numbers reproduced
Final confirming run with GRACE=300 and every fix installed:

  --all   ALL PASS  (T0 T3 T5 T8 T11 T12)
  --hard  ALL PASS  (replace / deny / disable, each policy verified)

Second independent measurement of the hard failover, which is what makes the
figures trustworthy rather than anecdotal:

                run 1   run 2
  replace        26s     26s
  deny          148s    141s
  disable        21s     20s

`deny` sits at ~141-148s across both, so it is the AC's dead-peer behaviour
and not a one-off; GRACE=300 keeps roughly 2x margin.

Corrected an overclaim in PPPOE-HA.md while confirming it: the invariant row
read "AC never showed two simdsl sessions", and under session-control=disable
it did -- one live, one orphaned from the destroyed router. Only ever one LIVE
router dialled, which is the invariant that matters. Said so plainly rather
than leaving a table that reads better than the evidence.
2026-09-06 00:42:01 +01:00

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=== 2026-09-06T00:39:29+01:00 ===
--- AC sessions ---
ifname | username | ip | ip6 | ip6-dp | calling-sid | rate-limit | state | uptime | rx-bytes | tx-bytes
--------+----------+----------------+-----+--------+-------------------+------------+--------+----------+----------+----------
ppp0 | simdsl | 198.51.100.136 | | | 52:54:00:e5:95:a2 | | active | 00:02:31 | 438 B | 204 B
ppp1 | simdsl | 198.51.100.137 | | | 52:54:00:4e:0b:56 | | active | 00:00:26 | 1.0 KiB | 204 B
--- 172.31.1.252 ---
--- 172.31.1.253 ---
vip=172.31.1.1 holds_vip=yes wan_disabled=no wan_up=yes ppp_up=yes ppp_active=yes may_dial=yes lease_age=5 dropin=yes role=master
pppoe0 UNKNOWN 198.51.100.137 peer 198.51.100.1/32
default nhid 60 dev pppoe0 proto static metric 20
Sep 05 23:27:40 vyos vrrp-wan[16198]: not MASTER but bond0.53 enabled -> releasing
Sep 05 23:27:47 vyos vrrp-wan[16840]: bond0.53 disable commit took 7s
Sep 05 23:32:26 vyos vrrp-wan[23806]: MASTER: dialling pppoe0
Sep 05 23:32:26 vyos vrrp-wan[23956]: MASTER with bond0.53 disabled -> enabling
Sep 05 23:32:31 vyos vrrp-wan[24749]: bond0.53 enable commit took 5s
-- Boot 4b0355878444477fb92738339f85843d --
Sep 05 23:39:03 vyos vrrp-wan[5966]: MASTER: dialling pppoe0
Sep 05 23:39:04 vyos vrrp-wan[6120]: MASTER with bond0.53 disabled -> enabling
Sep 05 23:39:09 vyos vrrp-wan[6914]: bond0.53 enable commit took 5s