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6500 - High CPU Utilization by FIB Process

FIB process was using all amount of CPU.

I started checking the cef table in the Supervisor Engine, with the "show polaris fibmgr usage" (hidden command)

Switch> (enable) sh polaris fibmgr usage

IP ucast:

msk=32: sb= 0 lb= 10 fb= -1, -1 (prf= 0,1227) fent= 9/13 alloc= 311

msk=30: sb= 11 lb= 15 fb= -1, -1 (prf=1248,2475) fent= 15/ 5 alloc= 133

msk=29: sb= 16 lb= 48 fb= -1, -1 (prf=2476,2884) fent= 48/21 alloc= 1045

msk=28: sb= 49 lb= 60 fb= -1, -1 (prf=2885,3293) fent= 55/14 alloc= 366

msk=27: sb= 61 lb= 65 fb= -1, -1 (prf=3294,4112) fent= 62/11 alloc= 139

msk=26: sb= 66 lb= 79 fb= -1, -1 (prf=4113,4931) fent= 79/11 alloc= 427

msk=25: sb= 80 lb= 89 fb= -1, -1 (prf=4932,5340) fent= 87/30 alloc= 318

msk=24: sb= 90 lb=2983 fb= -1, -1 (prf=5341,7388) fent=2983/29 alloc= 92605

msk=23: sb=2984 lb=3473 fb= -1, -1 (prf=7389,7486) fent=3470/13 alloc= 15661

msk=22: sb=3474 lb=3927 fb= -1, -1 (prf=7487,7567) fent=3926/ 8 alloc= 14504

msk=21: sb=3928 lb=4279 fb= -1, -1 (prf=7568,7599) fent=4264/29 alloc= 11229

msk=20: sb=4280 lb=4649 fb= -1, -1 (prf=7600,7631) fent=4647/ 8 alloc= 11816

msk=19: sb=4650 lb=4947 fb= -1, -1 (prf=7632,7663) fent=4945/ 8 alloc= 9512

msk=18: sb=4948 lb=5093 fb= -1, -1 (prf=7664,7695) fent=5029/22 alloc= 4662

msk=17: sb=5094 lb=5189 fb= -1, -1 (prf=7696,7727) fent=5095/20 alloc= 3060

msk=16: sb=5190 lb=5443 fb= -1, -1 (prf=7728,7808) fent=5432/ 9 alloc= 8105

msk=15: sb=5444 lb=5466 fb= -1, -1 (prf=7809,7828) fent=5464/23 alloc= 727

msk=14: sb=5467 lb=5478 fb= -1, -1 (prf=7829,7848) fent=5468/20 alloc= 372

msk=13: sb=5479 lb=5485 fb= -1, -1 (prf=7849,7868) fent=5483/14 alloc= 206

msk=12: sb=5486 lb=5489 fb= -1, -1 (prf=7869,7888) fent=5489/11 alloc= 107

msk=11: sb=5490 lb=5490 fb= -1, -1 (prf=7889,7908) fent=5490/30 alloc= 30

msk=10: sb=5491 lb=5491 fb= -1, -1 (prf=7909,7928) fent=5491/11 alloc= 11

msk= 9: sb=5492 lb=5492 fb= -1, -1 (prf=7929,7948) fent=5492/ 8 alloc= 8

msk= 8: sb=5493 lb=5493 fb= -1, -1 (prf=7949,8013) fent=5493/19 alloc= 19

msk= 0: sb=5494 lb=5494 fb=5495,8191 (prf=8154,8191) fent=5494/ 1 alloc= 1

IPX:

msk= 0: sb=4059 lb=4059 fb=5495,8191 (prf=8171,8191) fent=4059/ 1 alloc= 1

IP mcast:

Total FIB entries: 262144

Allocated FIB entries: 175375

Free FIB entries: 86769

FIB entries used for IP ucast: 175374

FIB entries used for IPX : 1

FIB entries used for IP mcast: 0

Total adjacencies: 262144

Allocated adjacencies: 132100

Free adjacencies: 130044

Adjacencies used for IP ucast (FIB) : 131064

Adjacencies used for IPX (FIB) : 3

The allocated FIB entries was increasing with a rate of around 3000 per minute.

In the normal situation we must have around 1300 adjacencies.

We remove all BGP entries in the routing table of the MSFC. In that moment only 1000 routes remained in the Routing Table. But the number of allocated FIB entries was still increasing. And remained increasing for almost one hour.

The only way to fix the problem was rebooting the device.

I need help to resolve this problem

1 REPLY
Silver

Re: 6500 - High CPU Utilization by FIB Process

Interrupt switching refers to the use of switching algorithms other than process switching. Examples include fast switching, optimum switching, Cisco Express Forwarding switching, Examine the output of the show interfaces switching command to see which interface is burdened with traffic. You can check the show ip interface command to see which switching method(s) are used on each interface. Re-enable interrupt switching on that interface. Remember that regular fast switching is configured on output interfaces: if fast switching is configured on an interface, packets that go out of that interface are fast-switched. Cisco Express Forwarding switching is configured on input interfaces. To create Forwarding Information Base (FIB) and adjacency table entries on a particular interface, configure Cisco Express Forwarding switching on all interfaces that route to that interface

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