Question

Weird entry in routing table

Asked by: every1isevil2

I am working on configuring a small lab environment and I am seeing a entry in the routing table that does not make sense.  I have followed the guideline for the lab set up to the T, and their samples show the exact same output EXCEPT for this one line:

C       10.1.100.2/32 is directly connected, Serial0/0

I understand WHAT the implications are of this in the routing table BUT why does it show up?  Is it because I am running a newer IOS?

Gateway of last resort is not set 
     10.0.0.0/8 is variably subnetted, 4 subnets, 2 masks
C       10.1.1.0/24 is directly connected, Loopback1
C       10.1.100.2/32 is directly connected, Serial0/0
C       10.1.100.0/24 is directly connected, Serial0/0
C       10.1.200.0/24 is directly connected, FastEthernet0/0 

R1#sho ip int bri
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            10.1.200.1      YES manual up                    up
Serial0/0                  10.1.100.1      YES manual up                    up
Loopback1                  10.1.1.1        YES manual up                    up 

R1#sho run | beg router
router ospf 1
 log-adjacency-changes
 network 10.1.100.0 0.0.0.255 area 0
 network 10.1.200.1 0.0.0.0 area 0
! 

R1#sho ver
Cisco IOS Software, C2600 Software (C2600-ADVIPSERVICESK9-M), Version 12.4(25b), RELEASE SOFTWARE (fc1)

                                  
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Asked On
2009-11-07 at 10:25:16ID24880719
Tags

Cisco OSPF routing router IOS

Topics

Network Routers

,

Network Design & Methodology

Participating Experts
4
Points
500
Comments
9

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Answers

 

by: rochey2009Posted on 2009-11-07 at 10:52:04ID: 25767531

hi,

please can you post the config.

 

by: every1isevil2Posted on 2009-11-07 at 11:44:18ID: 25767723

Here you go...although I believe I have already give everything relevant to the equation. 

!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
hostname R1
!
boot-start-marker
boot-end-marker
!
enable secret 5 $1$mLXZ$uv/xQfDzpaImKs/9uZio01
!
no aaa new-model
no network-clock-participate slot 1
no network-clock-participate wic 0
ip cef
!
!
!
!
no ip domain lookup
ip auth-proxy max-nodata-conns 3
ip admission max-nodata-conns 3
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
ip ssh version 1
!
!
!
!
!
interface Loopback1
 description Engineering Department
 ip address 10.1.1.1 255.255.255.0
 ip ospf network point-to-point
!
interface FastEthernet0/0
 ip address 10.1.200.1 255.255.255.0
 ip ospf cost 50
 ip ospf priority 10
 speed 100
 full-duplex
!
interface Serial0/0
 bandwidth 64
 ip address 10.1.100.1 255.255.255.0
 encapsulation ppp
 ip ospf network point-to-point
 clock rate 64000
!
router ospf 1
 log-adjacency-changes
 network 10.1.1.0 0.0.0.255 area 0
 network 10.1.100.0 0.0.0.255 area 0
 network 10.1.200.1 0.0.0.0 area 0
!
ip forward-protocol nd
!
!
no ip http server
no ip http secure-server
!
!
!
!
control-plane
!
!
!
!
mgcp behavior g729-variants static-pt
!
!
!
!
!
!
line con 0
 logging synchronous
line aux 0
line vty 0 4
 login
!
!
end
                                              
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by: benhansonPosted on 2009-11-07 at 15:38:02ID: 25768635

Is 10.1.100.2 the far end of the serial connection?

 

by: every1isevil2Posted on 2009-11-07 at 16:41:26ID: 25768846

Yes it is.

 

by: every1isevil2Posted on 2009-11-07 at 18:40:50ID: 25769209

The official name for this is "host route" but I am trying to figure out WHY it is there.  It is definitely not hurting anything  but why does it show up?

 

by: benhansonPosted on 2009-11-08 at 00:55:32ID: 25769854

I'm guessing it is the 'ip ospf network point-to-point' that causes it to show up.  I've had plenty of serial connections on OSPF enabled routers, and I've never seen that(also never used 'ip ospf network point-to-point')

http://www.cisco.com/en/US/tech/tk365/technologies_q_and_a_item09186a0080094704.shtml

 

by: donjohnstonPosted on 2009-11-08 at 07:23:20ID: 25770720

These entries show up on Cisco (and some other vendors) routers when using PPP encapsulation. I looked into it years ago and discovered why but have since forgotten as it was irrelevant.

Suffice it to say that it's a function of how Cisco has implemented PPP on their routers.  

 

by: 602650528Posted on 2009-11-10 at 13:07:31ID: 25789865

This is default behaviour as  designed for PPP IPCP for dynamic address allocation (e.g dialup access system) although not useful in this case.

to disable this behaviour do :

int s0/0
no peer neighbor-route


Remeber to bounce the interface after this configuration

 

by: rochey2009Posted on 2009-11-10 at 13:09:22ID: 25789884

The Cisco IOS software automatically creates neighbor routes by default; that is, it automatically sets up a route to the peer address on a point-to-point interface when the PPP IPCP negotiation is completed.

To disable this default behavior or to reenable it once it has been disabled, use the following commands in interface configuration mode:

no peer neighbor-route

20120131-EE-VQP-002

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