01-07-2012 02:58 PM - edited 03-07-2019 04:13 AM
Hi all,
I was working on my LAB.
Router A and B are configured with Frame relay - OSPF point to multipoint.
Both have direct connection back to back.
A
Router#sh run int se1/1
Building configuration...
Current configuration : 181 bytes
!
interface Serial1/1
ip address 192.168.9.3 255.255.255.0
encapsulation frame-relay
ip ospf network point-to-multipoint non-broadcast
no keepalive
Router ospf 1
neighbour 192.168.9.2
B
Router#sh run in se0/1
Building configuration...
Current configuration : 157 bytes
!
interface Serial0/1
ip address 192.168.9.2 255.255.255.0
encapsulation frame-relay
ip ospf network point-to-multipoint non-broadcast
no keepalive
end
Router ospf 1
neighbor 192.168.9.3
Both routers have nei command configured.
B Router
Router#sh ip ospf nei
Neighbor ID Pri State Dead Time Address Interface
N/A 0 DOWN/ - - 192.168.9.3 Serial0/1
OSPF nei is down at both ends.
Serial link is up up at both ends.
I know if i config frame relay map ip command on both ends then
OSPF nei relationship develops.
My question is point to multipoint network back to back serial interface does it work without frame relay map command or not?
Does the neighbour command with with point to multipont?
Thanks
mahesh
Solved! Go to Solution.
01-07-2012 08:28 PM
Hi Mahesh,
Question: what is router model you are using?
According to this link the neighbor command is only supported on the following platforms:
This feature is supported on these platforms:
•Cisco 1003, Cisco 1004, Cisco 1005
•Cisco 1600 series
•Cisco 2500 series
•Cisco 3600 series
•Cisco 3800 series
•Cisco 4000 series (Cisco 4000, 4000-M, 4500, 4500-M, 4700, 4700-M)
•Cisco 5200 series
•Cisco 7200 series
•Cisco 7500 series
•Cisco AS5300
If this feature is working on your router, can you apply the same neighbor command with priority and test again?
have a look at this link:
http://www.cisco.com/en/US/docs/ios/11_3/feature/guide/ospfpmp.html
HTH
01-08-2012 01:49 AM
Hi Mahesh,
The problem you describe is actually not related to the OSPF configuration.
Essentially, what you configured for OSPF is correct on this type of environment.
The problem is with the subnet you chose for the serial link. Because this is a /24, the router cannot determine over which PVC trafic must be sent. (Typical for point-multipoint) So actually your link is not treated as point-point, even though it is connected that way.
When you change the mask on the serial link and configure the routers to be in the same /30, the link will be truly point-point and then it will work without the frame-relay map command.
The point-multipoint scenario you considered will always require a frame-relay map entry.
http://www.cisco.com/en/US/partner/tech/tk365/technologies_tech_note09186a0080094051.shtml
regards,
Leo
01-07-2012 08:28 PM
Hi Mahesh,
Question: what is router model you are using?
According to this link the neighbor command is only supported on the following platforms:
This feature is supported on these platforms:
•Cisco 1003, Cisco 1004, Cisco 1005
•Cisco 1600 series
•Cisco 2500 series
•Cisco 3600 series
•Cisco 3800 series
•Cisco 4000 series (Cisco 4000, 4000-M, 4500, 4500-M, 4700, 4700-M)
•Cisco 5200 series
•Cisco 7200 series
•Cisco 7500 series
•Cisco AS5300
If this feature is working on your router, can you apply the same neighbor command with priority and test again?
have a look at this link:
http://www.cisco.com/en/US/docs/ios/11_3/feature/guide/ospfpmp.html
HTH
01-08-2012 01:49 AM
Hi Mahesh,
The problem you describe is actually not related to the OSPF configuration.
Essentially, what you configured for OSPF is correct on this type of environment.
The problem is with the subnet you chose for the serial link. Because this is a /24, the router cannot determine over which PVC trafic must be sent. (Typical for point-multipoint) So actually your link is not treated as point-point, even though it is connected that way.
When you change the mask on the serial link and configure the routers to be in the same /30, the link will be truly point-point and then it will work without the frame-relay map command.
The point-multipoint scenario you considered will always require a frame-relay map entry.
http://www.cisco.com/en/US/partner/tech/tk365/technologies_tech_note09186a0080094051.shtml
regards,
Leo
01-08-2012 02:12 AM
Hi Mahesh,
can you pls check if you are able to ping each other. I have a doubt if the ping would work.,
-Vijay
01-08-2012 08:48 AM
Hi Vijay,
i Can not ping router B from A
Router#ping 192.168.9.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.9.2, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
Thanks
Mahesh
01-08-2012 11:38 PM
mahesh18 wrote:
i Can not ping router B from A
Router#ping 192.168.9.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.9.2, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
Which is additional proof to the explanation provided.
01-09-2012 01:56 PM
Hi,
Thanks for reply.
I fig this out if we use
Point to multipoint with non broadcast we will need frame relay MAP command and also we need atleast 1 nei command
on router.
Also it worked with nei command on each router.
I tested this with 255.255.255 subnet and it worked fine.
Thanks everyone
Mahesh
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