The article explains the issue when issuing the command "show pfe filter hw summary" on ACX5448 routers, then BFD for bundle interfaces will sometimes fail causing a flap of the bundle interface.
Customer had noticed that issuing the command "show pfe filter hw summay" on their ACX5448
The BFD session flaps for a small fraction.
labroot@RE15# run show pfe filter hw summary | no-more
Jun 26 00:07:21
Slot 0
================================================================
Active Firewall Feature Profile is : default
INT-TCAM-BANK IN-USE WIDTH ENT-FREE ENT-MAX DIR HW-OWNER NUM-GRP
============= ====== ===== ======== ======= === ======== =======
0\1 Yes 320b 1950 2048 ING pmf-0 2
2\3 Yes 320b 2047 2048 ING pmf-1 1
4 No 160b 2048 2048 NA NA 0
5 No 160b 2048 2048 NA NA 0
6 No 160b 2048 2048 NA NA 0
7 No 160b 2048 2048 NA NA 0
8 No 160b 2048 2048 NA NA 0
9 No 160b 2048 2048 NA NA 0
10 No 160b 2048 2048 NA NA 0
11 No 160b 2048 2048 NA NA 0
12\13 Yes 320b 106 128 ING pmf-0 1
14 Yes 160b 116 128 ING pmf-0 1
15 No 160b 128 128 NA NA 0
INT-TCAM-BANK NUM-GRP
[edit]
labroot@RE15# run show bfd session address 172.16.1.2 extensive
Jun 26 00:06:21
Detect Transmit
Address State Interface Time Interval Multiplier
172.16.1.2 Up xe-0/0/3 0.450 0.150 3
Client LACPD, TX interval 0.150, RX interval 0.150
Session up time 00:02:28. ---------------------------------------------------------------- <<
Local diagnostic None, remote diagnostic None
Remote state Up, version 1
Session type: Micro BFD
Min async interval 0.150, min slow interval 1.000
Adaptive async TX interval 0.150, RX interval 0.150
Local min TX interval 0.150, minimum RX interval 0.150, multiplier 3
Remote min TX interval 0.150, min RX interval 0.150, multiplier 3
Local discriminator 20, remote discriminator 21
Echo TX interval 0.000, echo detection interval 0.000
Echo mode disabled/inactive
Remote is control-plane independent
Session ID: 0
On the above issue configuring BFD minimum-interval to 500ms resolves the issue