After a weekend upgrade, traffic stays on the backup router
TroubleshootingCore
The ticket
On Saturday R1, the primary internet router, was reloaded for an IOS-XE upgrade. R2 took over the gateway as
expected. On Monday users complain the internet is slow, and monitoring shows all traffic has gone out through R2's
100 Mbps backup circuit since Saturday instead of R1's 1 Gbps fiber. R1 is up, its interfaces are up, and its
uplink works. HSRP group 10 uses virtual IP 10.10.10.1; R1 is 10.10.10.2 with priority 110, R2 is 10.10.10.3
with the default 100.
Step 1 of 3
Traffic is using the backup router two days after the primary came back. Where do you look first?