10-29-2003 07:37 AM - edited 03-02-2019 11:19 AM
Dear Friends,
I have a frame-relay small network with a star topology. Core router is a 3640 and 7 branches use 1750.
Core router has 7 subinterfaces point-to-point configured in one an interface.
5 branches have subinterfaces in their interface and 2 use the interface without explicit subinterface.
Routing alghorithm is RIP 2, no special configuration is in place, mostly use default, including the reverse ARP.
The problem is: core router is not receiving branches routers advertisements. But each branch receives advertisements from core router.
I posted this question before, receiving two advices. First was "use broadcast option" and second "neighbor option".
I tried both but things did not change.
I would like to get some help for this.
Thanks, Paulo
10-29-2003 08:00 AM
Paulo,
Could you include the config of one of the remote sites.
Thanks,
10-29-2003 09:37 AM
Ok. It is one sample config, from branch router:
----------------------------------------------
!
version 12.1
service timestamps debug uptime
service timestamps log uptime
service password-encryption
!
hostname XXX-XX-ROT-002
!
no logging console
enable secret xxxxxxxx
enable password xxxxx
!
memory-size iomem 25
ip subnet-zero
no ip finger
no ip domain-lookup
!
interface Serial0
description Link para Concentrador
no ip address
encapsulation frame-relay ietf
frame-relay lmi-type ansi
!
interface serial0.1 point-to-point
ip address 192.168.110.2 255.255.255.252
frame-relay interface-dlci 16
no ip directed-broadcast
no cdp enable
no fair-queue
!
interface FastEthernet0
ip address 192.168.10.1 255.255.255.0
speed auto
!
router rip
version 2
network 192.168.10.0
network 192.168.110.0
no auto-summary
!
ip classless
no ip http server
!
line con 0
exec-timeout 0 0
password xxxx
login
transport input none line aux 0
password xxxxx
login
line vty 0 4
password xxxx
login
!
end
-------------------------------------------------
Paulo
10-30-2003 08:32 AM
Is the hub configured as point-to-point subinterfaces, or as a single multipoint interface? It should be configured as a set of point-to-point subinterfaces, the way you have your remotes configured.
Russ.W
10-30-2003 10:09 AM
The hub has 7 sub-interfaces as point-to-point.
All data is flowing correctly, except Rip advertisements from branches to HQ.
Paulo
10-30-2003 05:42 PM
Can you ping 224.0.0.9? If the remotes respond, then there's a problem on the RIP side, most likely. If they don't, then multicast isn't working.
Russ.W
10-29-2003 10:50 AM
Paulo,
Can the core router ping the branch routers over frame relay, and vice versa?
Mark
10-29-2003 11:08 AM
Yes, as I put static routes on the core, to circumvent this problem, everything is ok.
I can ping, data flows, all the system is working.
The only thing is that I cannot receive branches routers advertisements on the core.
In the past, we had this network running, in the same topology, with dedicated lines and Rip v2. At that time everything was ok. As we changed to frame-relay, we observed that the core stopped receiving branches routes.
Paulo
10-29-2003 12:57 PM
Hello Paulo,
I am not sure what the config of your hub router looks like, but you might want to check if split-horizon is disabled. Try to explicitly disable it with no ip split-horizon command.
Regards,
Georg
10-30-2003 12:04 PM
split horizon would only prevent the hub from propagating the updates from one spoke to another.
Can we have a "sh ip prot" on one of the spokes and the hub.
Thanks,
10-30-2003 12:57 PM
It appears that broadcast / multicast is broken in the FR could , Is this FR over MPLS or straight FR ?
If straight FR then try a neighbor statement form the hub sites under router rip
router rip
neighbor 192.168.110.2
10-31-2003 04:23 AM
I put two branches with neighbor command, in HQ´s core and the two branches.
But, nothing changes.
I also put the broadcast option in the frame-relay interface-dlci command. IOS accepts this command, no error message is issued, but the option does not work (IOS bug?).
Paulo
10-31-2003 04:31 AM
The reason it doesn't work is that these are point-to-point subinterfaces, which means they are broadcast capable anyway. The broadcast keyword only has an impact on point-to-multipoint interfaces.
Can you ping 224.0.0.9?
Russ.W
10-31-2003 04:46 AM
We can see below sh ip prot for Core and one Branch.
Static routes, I have put to circumvent the problem, are listed.
----------------------------------------------------------------
CORE-ROT-001# sh ip prot
Routing Protocol is "rip"
Sending updates every 30 seconds, next due in 11 seconds
Invalid after 180 seconds, hold down 180, flushed after 240
Outgoing update filter list for all interfaces is
Incoming update filter list for all interfaces is
Redistributing: rip
Neighbor(s):
192.168.102.2
192.168.110.2
Default version control: send version 2, receive version 2
Interface Send Recv Triggered RIP Key-chain
FastEthernet0/0 2 2
Serial0/0.1 2 2
Serial0/0.2 2 2
Serial0/0.3 2 2
Serial0/0.4 2 2
Serial0/0.5 2 2
Serial0/0.6 2 2
Serial0/0.7 2 2
FastEthernet0/1 2 2
Automatic network summarization is not in effect
Routing for Networks:
192.168.0.0
192.168.1.0
Interface Send Recv Triggered RIP Key-chain
192.168.102.0
192.168.103.0
192.168.104.0
192.168.105.0
192.168.107.0
192.168.109.0
192.168.110.0
Routing Information Sources:
Gateway Distance Last Update
192.168.107.2 120 00:00:27
192.168.104.2 120 00:00:04
192.168.105.2 120 00:00:17
192.168.110.2 120 00:00:12
192.168.109.2 120 3w0d
192.168.102.2 120 3w3d
192.168.103.2 120 3w0d
Distance: (default is 120)
------------------------------------------------------------------------
BRANCH10-ROT-002#sh ip prot
Routing Protocol is "rip"
Sending updates every 30 seconds, next due in 24 seconds
Invalid after 180 seconds, hold down 180, flushed after 240
Outgoing update filter list for all interfaces is
Incoming update filter list for all interfaces is
Redistributing: rip
Neighbor(s):
192.168.110.1
Default version control: send version 2, receive version 2
Interface Send Recv Triggered RIP Key-chain
FastEthernet0 2 2
Serial0.1 2 2
Automatic network summarization is not in effect
Routing for Networks:
192.168.10.0
192.168.110.0
Routing Information Sources:
Gateway Distance Last Update
192.168.110.1 120 00:00:16
Distance: (default is 120)
10-31-2003 06:30 AM
Can you paste in the core config , it looks like you are only advertising 192.168.0.0 192.168.1.0 , is no auto-summary configured ?
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