rib update return code

I was uncessuful in finding information about rib update codes using Google

Anyone knows where I could find the meaning of these codes???

output from *debug ip routing*: while running rip and eigrp
*Apr 10 17:11:35.251: RT: updating rip 3.3.3.3/32 (0x0) via 10.10.128.65
Et0/0
*Apr 10 17:11:35.251: RT: updating rip 10.10.2.2/32 (0x0) via 10.10.128.65
Et0/0
*Apr 10 17:11:35.251: RT: updating rip 10.10.5.5/32 (0x0) via 10.10.128.65
Et0/0
*Apr 10 17:11:35.251: RT: updating rip 10.10.7.7/32 (0x0) via 10.10.128.65
Et0/0
*Apr 10 17:11:35.251: RT: updating rip 10.10.8.8/32 (0x0) via 10.10.128.65
Et0/0
*Apr 10 17:11:35.251: RT: *rib update return code: 19*
*Apr 10 17:11:35.251: RT: updating rip 10.10.9.9/32 (0x0) via 10.10.128.65
Et0/0
*Apr 10 17:11:35.251: RT: updating rip 10.10.10.10/32 (0x0) via 10.10.128.65
Et0/0
*Apr 10 17:11:35.251: RT: updating rip 10.10.128.0/27 (0x0) via 10.10.128.65
Et0/0
*Apr 10 17:11:35.251: RT: updating rip 10.10.128.0/30 (0x0) via 10.10.128.65
Et0/0
*Apr 10 17:11:35.251: RT: rib update return code: 17
*Apr 10 17:11:35.251: RT: updating rip 10.10.128.96/27 (0x0) via
10.10.128.65 Et0/0
*Apr 10 17:11:35.251: RT:* rib update return code: 17*
*Apr 10 17:11:35.251: RT: updating rip 10.10.128.128/27 (0x0) via
10.10.128.65 Et0/0
*Apr 10 17:11:35.251: RT: updating rip 10.10.128.160/27 (0x0) via
10.10.128.65 Et0/0
*Apr 10 17:11:35.251: RT: updating rip 10.10.128.192/27 (0x0) via
10.10.128.65 Et0/0
*Apr 10 17:11:35.251: RT: rib update return code: 19

Thanks,
/Carl

R4#sh ip protocol
*** IP Routing is NSF aware ***

Routing Protocol is "eigrp 10"
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
    Serial1/0 filtered by 4 (per-user), default is not set
  Default networks flagged in outgoing updates
  Default networks accepted from incoming updates
  Redistributing: eigrp 10, rip
  EIGRP-IPv4 Protocol for AS(10)
    Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
    NSF-aware route hold timer is 240
    Router-ID: 10.10.4.4
    Topology : 0 (base)
      Active Timer: 3 min
      Distance: internal 90 external 170
      Maximum path: 4
      Maximum hopcount 100
      Maximum metric variance 1

  Automatic Summarization: disabled
  Maximum path: 4
  Routing for Networks:
    10.10.14.0/24
  Routing Information Sources:
    Gateway Distance Last Update
    10.10.14.1 90 00:07:08
  Distance: internal 90 external 170

Routing Protocol is "rip"
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Sending updates every 30 seconds, next due in 22 seconds
  Invalid after 180 seconds, hold down 180, flushed after 240
  Redistributing: eigrp 10, rip
  Neighbor(s):
    10.10.128.65
    10.10.128.97
  Default version control: send version 2, receive version 2
  Automatic network summarization is not in effect
  Maximum path: 4
  Routing for Networks:
    10.0.0.0
  Passive Interface(s):
    Ethernet0/0
    Ethernet0/1
  Passive Interface(s):
    Ethernet0/2
    Ethernet0/3
    Serial1/0
    Serial1/1
    Serial1/2
    Serial1/3
    Loopback0
    VoIP-Null0
  Routing Information Sources:
    Gateway Distance Last Update
    10.10.128.65 120 00:00:20
    10.10.128.97 120 00:00:11
  Distance: (default is 120)

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Received on Sun Apr 10 2011 - 14:01:22 ART