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Knowledge Base

The failed of transmit caused by FIB error

Publication Date:  2012-12-17  |   Views:  792  |   Downloads:  0  |   Author:  l00118588  |   Document ID:  EKB1000021760


Issue Description

After adjusted the firewall routing in a network, a web server did not fuctioned. 

Alarm Information


Handling Process

Checking the routing list, discovered that the adjusted routing is normal, but the transmition is failed.

to examinate FIB table, it is not finded the corresponded item in the FIB list, it may be the issued bug caused the route finally not to become effective.

[USG2200]disp ip rout    
11:04:03  2012/12/13
Route Flags: R - relay, D - download to fib
Routing Tables: Public
        Destinations : 10       Routes : 10 
Destination/Mask    Proto  Pre  Cost     Flags NextHop         Interface         Static 60   0          RD       GigabitEthernet0/0/1  Direct 0    0           D        GigabitEthernet0/0/0  Direct 0    0           D       InLoopBack0   Direct 0    0           D       GigabitEthernet0/0/1  Direct 0    0           D       InLoopBack0    Direct 0    0           D       InLoopBack0   Direct 0    0           D       InLoopBack0  Direct 0    0           D     Vlanif1     Direct 0    0           D       InLoopBack0   Static 60   0          RD        GigabitEthernet0/0/0 
[USG2200]disp fib 
11:04:07  2012/12/13
Fib Flags: B - blackhole, D - dynamic, G - gateway, H - host, S - static      
           U - up
FIB Table:   
Total number of Routes : 10
Destination/Mask   Nexthop         Flag TimeStamp     Interface       TunnelID       HU   t[57]         InLoop0         0x0       U    t[57]         InLoop0         0x0       HU   t[125]        InLoop0         0x0     U    t[125]        Vlanif1         0x0       HU   t[94889]      InLoop0         0x0        U    t[94889]      GE0/0/0         0x0       HU   t[94952]      InLoop0         0x0       U    t[94952]      GE0/0/1         0x0       GSU  t[95514]      GE0/0/1         0x0
Deletes the route repeatedly, and redeploys the route, transfers the publication not to correspond the repeater item, this possibly involves the edition flaw, after restarts the equipment , the transmition is normal,  and then the correspond item was find in the FIB.

Root Cause

After adjusting the route, the discontinuance of business generally speaking many concerns with the route that adjusts. 


it is not only check the routing table but the FIB table in doing troubleshooting of transmit failed,  generally it is ofen to neglect to inspection FIB infomation.