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BGP Smoothing Interval Exceeded

I got this error meassge on one of customer routers where the BGP failed:

SYSLOG Smoothing        Interval Exceeded Alarm:xxxxxxxxxx BGP-5-ADJCHANGE down 666 seconds        which exceeds smoothing interval of 660 seconds for neighbor x.x.x.x.

the BGP config:

router bgp 65002

bgp log-neighbor-changes

network x.x.x.x mask x.x.x.x

timers bgp 15 45

neighbor x.x.x.x remote-as xxxxx

neighbor x.x.x.x description PE - load sharing

neighbor x.x.x.x soft-reconfiguration inbound

neighbor x.x.x.x route-map setmedprimary out

neighbor x.x.x.x filter-list 1 in

We found that the link was down between the CE and PE router, but I don't understeand why the BGP adjecency didn't fail on dead timer set to 45s.

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