I am seeing lots of the errors below on routers BFD is enable on and i suspect the problem is related to the BFD timers are too low. Below is config on one of the routers. I have removed some configs for confidential reasons. I am seeing the errors every 1mins...
interface GigabitEthernet2/1/1 bandwidth 100000 ip address ******* ip ospf network point-to-point ip ospf cost 1000 ip ospf hello-interval 3 ip ospf dead-interval 10 ip ospf bfd load-interval 30 media-type rj45 speed 100 duplex full no negotiation auto bfd interval 100 min_rx 100 multiplier 5 service-policy output INT_OUT end
Mar 12 13:24:55.851 GMT: %OSPF-5-ADJCHG: Process 1, Nbr ******* on GigabitEthernet2/1/1 from FULL to DOWN, Neighbor Down: BFD node down Mar 12 13:24:57.779 GMT: %OSPF-5-ADJCHG: Process 1, Nbr ******** on GigabitEthernet2/1/1 from LOADING to FULL, Loading Done
sh bfd neighbors *********** details
OurAddr NeighAddr LD/RD RH/RS Holddown(mult) State Int ************* ********** 74/113 Up 416 (5 ) Up Gi2/1/1 Session state is UP and not using echo function. Local Diag: 0, Demand mode: 0, Poll bit: 0 MinTxInt: 100000, MinRxInt: 100000, Multiplier: 5 Received MinRxInt: 100000, Received Multiplier: 5 Holddown (hits): 416(0), Hello (hits): 100(117697) Rx Count: 79630, Rx Interval (ms) min/max/avg: 80/104/90 last: 84 ms ago Tx Count: 79557, Tx Interval (ms) min/max/avg: 80/104/90 last: 64 ms ago Elapsed time watermarks: -1 0 (last: 0) Registered protocols: OSPF Uptime: 02:29:15 Last packet: Version: 1 - Diagnostic: 0 State bit: Up - Demand bit: 0 Poll bit: 0 - Final bit: 0 Multiplier: 5 - Length: 24 My Discr.: 113 - Your Discr.: 74 Min tx interval: 100000 - Min rx interval: 100000 Min Echo interval: 0
sh ip ospf neighbor gigabitEthernet 2/1/1 detail Neighbor *********, interface address ************** In the area 0.0.0.0 via interface GigabitEthernet2/1/1, BFD enabled Neighbor priority is 0, State is FULL, 6 state changes DR is 0.0.0.0 BDR is 0.0.0.0 Options is 0x12 in Hello (E-bit L-bit ) Options is 0x52 in DBD (E-bit L-bit O-bit) LLS Options is 0x1 (LR) Dead timer due in 00:00:09 Neighbor is up for 02:30:15 Index 4/4, retransmission queue length 0, number of retransmission 0 First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0) Last retransmission scan length is 0, maximum is 0 Last retransmission scan time is 0 msec, maximum is 0 msec
We do have LLQ and CBWFQ enable. See below. What i do not see is a match for BFD unless BFD falls under DSCP class cs6 for routing traffic by default. I believe BFD uses UDP port 3784 for destination and ensulation and source port range 49152 to 65535. Policy-map is not showing any drops though!
class-map match-all Routing_Traffic
match access-group name Routing_Traffic
policy-map INT_OUT class Routing_Traffic bandwidth remaining percent 5
ip access-list extended Routing_Traffic remark >> accept dscp cs6 << permit ip any any dscp cs6 remark >> BGP <<< permit tcp any eq bgp any permit tcp any any eq bgp remark >> HSRP << permit udp any host 22.214.171.124 eq 1985 remark >> U_MARK_ROUTINGQ-version-2 <<
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