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Posted by John Smith on February 24, 2005, 2:56 pm
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Gang,
I have a bisic coniguration for routing rip but when I do a sh ip route rip
or sh ip route the table is empty as far as rip (R) updates go. I thought I
would except to show R on the route table as the networks are connected.
When I looked at the debug, shown below, and see that the e0 is sending but
the receiving updates are getting suppressed ...null update. I cant figure
out why this is happening can anyone put some light on the subject. Also
the routing table below just shows the networks connected, networks on each
router....router a and router b. See the show run below ios 12.x for all
routers.
I did not give the other router's config as the are the same except for the
ip address which is 192.168.0.100 /24 on the othe routers e0
Router A
iterface Ethernet0
ip address 192.168.0.201 255.255.255.0
no mop enabled
!
interface Ethernet1
no ip address
no cdp enable
!
interface Serial0
no ip address
shutdown
no fair-queue
!
interface Serial1
no ip address
shutdown
no cdp enable
!
router rip
network 192.168.0.0
!
ip classless
ip http server
!
!
!
line con 0
exec-timeout 0 0
password cisco
login
line aux 0
line vty 0 4
password cisco
login
!
end
RIP: sending v1 update to 255.255.255.255 via Ethernet0 (192.168.0.201
)
02:33:23: RIP: build update entries - suppressing null update
02:33:49: RIP-TIMER: periodic timer expired
02:33:49: RIP: sending v1 update to 255.255.255.255 via Ethernet0
(192.168.0.201
)
02:33:49: RIP: build update entries - suppressing null update
02:34:19: RIP-TIMER: periodic timer expired
02:34:19: RIP: sending v1 update to 255.255.255.255 via Ethernet0
(192.168.0.201
)
02:34:19: RIP: build update entries - suppressing null update
***********Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile,
B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter
area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is not set
C 192.168.0.0/24 is directly connected,
Ethernet0************************************************************
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Posted by Ivan Ostreš on February 24, 2005, 11:16 pm
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says...
> I did not give the other router's config as the are the same except for the
> ip address which is 192.168.0.100 /24 on the othe routers e0
>
The router is suppresing the update because what it gets is the same
network to which is connected. Try adding some additional interfaces on
one of the routers (loopback will be just fine) and add their networks
to RIP. Then you will se on other routers routing table some "R" routes.
--
-Ivan.
*** Use Rot13 to see my eMail address ***
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