When I say I moved the cable, I mean I moved the cable going to my ONT from the WAN port of my Centurylink router to the WAN1 port of my router.
logread doesn't appear to be installed on my router, but I was able to tail /var/log/messages and gather info that way.
Disconnect WAN1:
Oct 3 19:01:52.192 kern.notice kernel: [63616.914536] eth0: Link down: previous state 100 Mbps Full duplex, port 0
Oct 3 19:01:52.192 kern.info kernel: [63616.914547] QCA8337: This is REDACTED device, driver 'Generic PHY'
Oct 3 19:01:52.192 kern.info kernel: [63616.914552] QCA8337: Configuring WAN (eth0) port (#0)
Oct 3 19:01:52.000 daemon.notice netifd: Network device 'eth0' link is down
Oct 3 19:01:52.000 daemon.notice netifd: Interface 'wan' has link connectivity loss
Oct 3 19:01:52.000 daemon.info pppd[6221]: Terminating on signal 15
Oct 3 19:01:52.000 daemon.info pppd[6221]: Connect time 1059.2 minutes.
Oct 3 19:01:52.000 daemon.info pppd[6221]: Sent 2361819627 bytes, received 2500659969 bytes.
Oct 3 19:01:52.000 daemon.notice netifd: Network device 'eth0-pppoe' link is down
Oct 3 19:01:52.000 user.notice route: Entering route fixup for wan - eth0 - 0
Oct 3 19:01:52.000 user.notice route: Should configure route for wan - eth0
Oct 3 19:01:52.000 user.warning route: Route for 'wan' could not be repaired. (ERROR: route add default dev eth0-pppoe metric 10 )
reconnect WAN1
Oct 3 19:05:54.282 kern.notice kernel: [63859.001702] eth0: Link up: 1000 Mbps Full duplex, port 0
Oct 3 19:05:54.282 kern.info kernel: [63859.001712] QCA8337: This is REDACTED device, driver 'Generic PHY'
Oct 3 19:05:54.282 kern.info kernel: [63859.001717] QCA8337: Configuring WAN (eth0) port (#0)
Oct 3 19:05:54.000 daemon.notice netifd: Network device 'eth0' link is up
Oct 3 19:05:54.000 daemon.notice netifd: Interface 'wan' has link connectivity
Oct 3 19:05:54.000 daemon.notice netifd: Interface 'wan' is setting up now
Oct 3 19:05:54.000 user.info PPPoE: +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=
Oct 3 19:05:54.000 user.info PPPoE: Retry PPPoE on wan connection in 30 seconds...
Oct 3 19:05:54.000 user.info PPPoE: +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=
Oct 3 19:06:24.000 daemon.info pppd[3281]: Plugin rp-pppoe.so loaded.
Oct 3 19:06:24.000 daemon.info pppd[3281]: RP-PPPoE plugin version 3.8p compiled against pppd 2.4.7
Oct 3 19:06:24.000 daemon.notice pppd[3281]: pppd 2.4.7 started by root, uid 0
Oct 3 19:06:24.000 daemon.info pppd[3281]: PPP session is 2923
Oct 3 19:06:24.000 daemon.warning pppd[3281]: Connected to 40:b4:f0:e9:05:7a via interface eth0
Oct 3 19:06:24.000 daemon.info pppd[3281]: Using interface eth0-pppoe
Oct 3 19:06:24.000 daemon.notice pppd[3281]: Connect: eth0-pppoe <--> eth0
Oct 3 19:06:24.000 daemon.info pppd[3281]: CHAP authentication succeeded
Oct 3 19:06:24.000 daemon.notice pppd[3281]: CHAP authentication succeeded
Oct 3 19:06:24.000 daemon.notice pppd[3281]: peer from calling number 40:B4:F0:E9:05:7A authorized
Oct 3 19:06:24.000 daemon.notice netifd: Network device 'eth0-pppoe' link is up
Oct 3 19:06:24.000 daemon.notice pppd[3281]: local IP address REDACTED
Oct 3 19:06:24.000 daemon.notice pppd[3281]: remote IP address REDACTED
Oct 3 19:06:24.000 daemon.notice pppd[3281]: primary DNS address REDACTED
Oct 3 19:06:24.000 daemon.notice pppd[3281]: secondary DNS address REDACTED
Oct 3 19:06:24.000 daemon.notice netifd: Interface 'wan' is now up
Oct 3 19:06:24.000 daemon.notice mrouted[7927]: mrouted version 3.9.8 exiting
Oct 3 19:06:24.000 user.debug uci: (hotplug-call) /bin/sh -> (uci) /sbin/uci : uci_delta_save /sbin/uci.lan.up=1
Oct 3 19:06:24.000 user.debug uci: (hotplug-call) /bin/sh -> (uci) /sbin/uci : uci_delta_save /sbin/uci.lan.device=agl0
Oct 3 19:06:24.000 user.debug uci: (hotplug-call) /bin/sh -> (uci) /sbin/uci : uci_delta_save /sbin/uci.loopback.up=1
Oct 3 19:06:24.000 user.debug uci: (hotplug-call) /bin/sh -> (uci) /sbin/uci : uci_delta_save /sbin/uci.loopback.device=lo
Oct 3 19:06:24.000 user.debug uci: (hotplug-call) /bin/sh -> (uci) /sbin/uci : uci_delta_save /sbin/uci.vlan0.up=1
Oct 3 19:06:24.000 user.debug uci: (hotplug-call) /bin/sh -> (uci) /sbin/uci : uci_delta_save /sbin/uci.vlan0.device=agl0
Oct 3 19:06:24.000 user.debug uci: (hotplug-call) /bin/sh -> (uci) /sbin/uci : uci_delta_save /sbin/uci.wan.device=eth0
Oct 3 19:06:24.000 user.debug uci: (hotplug-call) /bin/sh -> (uci) /sbin/uci : uci_delta_save /sbin/uci.wan.ifname=eth0-pppoe
Oct 3 19:06:24.000 user.debug uci: (hotplug-call) /bin/sh -> (uci) /sbin/uci : uci_delta_save /sbin/uci.vpn0.up=1
Oct 3 19:06:24.000 user.debug uci: (hotplug-call) /bin/sh -> (uci) /sbin/uci : uci_delta_save /sbin/uci.vpn0.device=tun0
Oct 3 19:06:24.000 user.debug uci: (hotplug-call) /bin/sh -> (uci) /sbin/uci : uci_delta_save /sbin/uci.wan.up=1
Oct 3 19:06:24.000 user.debug uci: (hotplug-call) /bin/sh -> (uci) /sbin/uci : uci_delta_save /sbin/uci.lan.up=1
Oct 3 19:06:24.000 user.debug uci: (hotplug-call) /bin/sh -> (uci) /sbin/uci : uci_delta_save /sbin/uci.lan.device=agl0
Oct 3 19:06:24.000 user.debug uci: (hotplug-call) /bin/sh -> (uci) /sbin/uci : uci_delta_save /sbin/uci.loopback.up=1
Oct 3 19:06:24.000 user.debug uci: (hotplug-call) /bin/sh -> (uci) /sbin/uci : uci_delta_save /sbin/uci.loopback.device=lo
Oct 3 19:06:24.000 user.debug uci: (hotplug-call) /bin/sh -> (uci) /sbin/uci : uci_delta_save /sbin/uci.vlan0.up=1
Oct 3 19:06:24.000 user.debug uci: (hotplug-call) /bin/sh -> (uci) /sbin/uci : uci_delta_save /sbin/uci.vlan0.device=agl0
Oct 3 19:06:24.000 user.debug uci: (hotplug-call) /bin/sh -> (uci) /sbin/uci : uci_delta_save /sbin/uci.wan.ifname=eth0-pppoe
Oct 3 19:06:24.000 user.debug uci: (hotplug-call) /bin/sh -> (uci) /sbin/uci : uci_delta_save /sbin/uci.vpn0.up=1
Oct 3 19:06:24.000 user.debug uci: (hotplug-call) /bin/sh -> (uci) /sbin/uci : uci_delta_save /sbin/uci.vpn0.device=tun0
Oct 3 19:06:24.000 user.debug uci: (hotplug-call) /bin/sh -> (uci) /sbin/uci : uci_delta_save /sbin/uci.wan.up=1
Oct 3 19:06:24.000 user.debug uci: (hotplug-call) /bin/sh -> (uci) /sbin/uci : uci_delta_save /sbin/uci.wan.device=eth0
Oct 3 19:06:24.000 user.debug uci: (hotplug-call) /bin/sh -> (uci) /sbin/uci : uci_delta_save /sbin/uci.lan.up=1
Oct 3 19:06:24.000 user.debug uci: (hotplug-call) /bin/sh -> (uci) /sbin/uci : uci_delta_save /sbin/uci.lan.device=agl0
Oct 3 19:06:24.000 user.debug uci: (hotplug-call) /bin/sh -> (uci) /sbin/uci : uci_delta_save /sbin/uci.loopback.up=1
Oct 3 19:06:24.000 user.debug uci: (hotplug-call) /bin/sh -> (uci) /sbin/uci : uci_delta_save /sbin/uci.loopback.device=lo
Oct 3 19:06:24.000 user.debug uci: (hotplug-call) /bin/sh -> (uci) /sbin/uci : uci_delta_save /sbin/uci.vlan0.up=1
Oct 3 19:06:24.000 user.debug uci: (hotplug-call) /bin/sh -> (uci) /sbin/uci : uci_delta_save /sbin/uci.vlan0.device=agl0
Oct 3 19:06:24.000 user.debug uci: (hotplug-call) /bin/sh -> (uci) /sbin/uci : uci_delta_save /sbin/uci.vpn0.up=1
Oct 3 19:06:24.000 user.debug uci: (hotplug-call) /bin/sh -> (uci) /sbin/uci : uci_delta_save /sbin/uci.vpn0.device=tun0
Oct 3 19:06:24.000 user.debug uci: (hotplug-call) /bin/sh -> (uci) /sbin/uci : uci_delta_save /sbin/uci.wan.up=1
Oct 3 19:06:24.000 user.debug uci: (hotplug-call) /bin/sh -> (uci) /sbin/uci : uci_delta_save /sbin/uci.wan.device=eth0
Oct 3 19:06:24.000 user.debug uci: (hotplug-call) /bin/sh -> (uci) /sbin/uci : uci_delta_save /sbin/uci.wan.ifname=eth0-pppoe
connect WAN2
Oct 3 19:03:47.916 kern.info kernel: [63732.633108] IPv6: ADDRCONF(NETDEV_CHANGE): eth1: link becomes ready
Oct 3 19:03:47.916 kern.notice kernel: [63732.633681] eth1: Link up: 1000 Mbps Full duplex, port 16
Oct 3 19:03:47.916 kern.info kernel: [63732.633690] QCA8337: This is REDACTED device, driver 'Generic PHY'
Oct 3 19:03:47.916 kern.info kernel: [63732.633695] QCA8337: Configuring WAN (eth1) port (#16)
disconnect WAN2
Oct 3 19:04:19.956 kern.notice kernel: [63764.672774] eth1: Link down: previous state 100 Mbps Full duplex, port 16
Oct 3 19:04:19.956 kern.info kernel: [63764.672784] QCA8337: This is REDACTED device, driver 'Generic PHY'
Oct 3 19:04:19.956 kern.info kernel: [63764.672789] QCA8337: Configuring WAN (eth1) port (#16)
disconnect LAN1
Oct 3 19:09:58.966 kern.info kernel: [64103.732692] Atheros AR8216/AR8236/AR8316/AR8337 (ar8216.c) 8001180000001800:00: Port 1 is down
connect LAN1
Oct 3 19:10:02.966 kern.info kernel: [64107.732581] Atheros AR8216/AR8236/AR8316/AR8337 (ar8216.c) 8001180000001800:00: Port 1 is up
disconnect LAN2
Oct 3 19:11:26.966 kern.info kernel: [64191.732859] Atheros AR8216/AR8236/AR8316/AR8337 (ar8216.c) 8001180000001800:00: Port 2 is down
connect LAN2
Oct 3 19:11:28.966 kern.info kernel: [64193.732779] Atheros AR8216/AR8236/AR8316/AR8337 (ar8216.c) 8001180000001800:00: Port 2 is up