From: Serhat Aslan (serhatworks@gmail.com)
Date: Mon Aug 06 2007 - 03:20:36 ART
ip ospf mtu-ignore :)
When you use ospf between switch and router don't forget to use interface
command, in some conditions you have to use bigger than mtu 1500 (ex:
l2tp..)
On 8/6/07, brajesh.thakur@wipro.com <brajesh.thakur@wipro.com> wrote:
>
> Ajay change your routing mtu size to 1500 on Switches. I had faced the
> same problem.
>
> Warm Regards,
> Brajesh Thakur
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Ajay Prakash
> Sent: Monday, August 06, 2007 10:53 AM
> To: Cisco certification; Ajay
> Subject: Unable to bring up OSPF adjacency :-|
>
> Hello Group,
>
> I am unable to bring up a adjecency between a router R2 and Switch SW1
> and I
> am unable to understand why. Below is my configuration:
>
> R2-----------SW2-------------SW1
>
> Thanks.
>
> Rack2R2#p 162.2.27.7 <-- SW1 Ip address
>
> Type escape sequence to abort.
> Sending 5, 100-byte ICMP Echos to 162.2.27.7, timeout is 2 seconds:
> !!!!!
> Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms
>
>
> Rack2R2#sh run | b router ospf
> router ospf 1
> router-id 150.2.2.2
> log-adjacency-changes
> area 27 stub
> network 150.2.2.2 0.0.0.0 area 0
> network 162.2.0.2 0.0.0.0 area 0
> network 162.2.27.2 0.0.0.0 area 27
>
> Rack2SW1#sh run | b router ospf
> router ospf 1
> router-id 150.2.7.7
> log-adjacency-changes
> area 27 stub
> network 150.2.7.7 0.0.0.0 area 27
> network 162.2.27.7 0.0.0.0 area 27
>
>
>
> Rack2R2#sh ip ospf neig
>
> Neighbor ID Pri State Dead Time Address
> Interface
> 150.2.3.3 100 FULL/DR 00:01:49 162.2.0.3
> Serial0/0.1
> 150.2.7.7 1 EXSTART/DR 00:00:38 162.2.27.7
> FastEthernet0/0
> Rack2R2#
>
> Rack2R2#
> *Jul 31 10:36:25.007: %OSPF-5-ADJCHG: Process 1, Nbr 150.2.7.7 on
> FastEthernet0/0 from EXSTART to DOWN, Neighbor Down: Too many
> retransmissions
>
>
> Rack2R2#sh ip ospf int fa0/0
> FastEthernet0/0 is up, line protocol is up
> Internet Address 162.2.27.2/24, Area 27
> Process ID 1, Router ID 150.2.2.2, Network Type BROADCAST, Cost: 1
>
> 03:26:41: %OSPF-5-ADJCHG: Process 1, Nbr 150.2.2.2 on Vlan27 from DOWN
> to
> DOWN, Neighbor Down: Ignore timer expired
>
> Rack2SW1#sh ip ospf neig
>
> Neighbor ID Pri State Dead Time Address
> Interface
> 150.2.2.2 1 EXSTART/BDR 00:00:35 162.2.27.2 Vlan27
>
> Rack2SW1#sh ip ospf int vlan27
> Vlan27 is up, line protocol is up
> Internet Address 162.2.27.7/24, Area 27
> Process ID 1, Router ID 150.2.7.7, Network Type BROADCAST, Cost: 1
>
>
> Rack2SW1#sh ip ospf int vlan27
> Vlan27 is up, line protocol is up
> Internet Address 162.2.27.7/24, Area 27
> Process ID 1, Router ID 150.2.7.7, Network Type BROADCAST, Cost: 1
>
>
>
> Rack2SW1#debu ip ospf hello
> OSPF hello events debugging is on
> Rack2SW1#u all
> 03:25:50: OSPF: Send hello to 224.0.0.5 area 27 on Vlan27 from
> 162.2.27.7
> Rack2SW1#u all
> 03:25:51: OSPF: Rcv hello from 150.2.2.2 area 27 from Vlan27 162.2.27.2
> 03:25:51: OSPF:
> OSPF: Nbr 150.2.2.2 162.2.27.2 Vlan27 is currently ignored
> Rack2SW1#u all
> 03:26:00: OSPF: Send hello to 224.0.0.5 area 27 on Vlan27 from
> 162.2.27.7
> Rack2SW1#u all
> 03:26:01: OSPF: Rcv hello from 150.2.2.2 area 27 from Vlan27 162.2.27.2
> 03:26:01: OSPF:
> OSPF: Nbr 150.2.2.2 162.2.27.2 Vlan27 is currently ignored
> Rack2SW1#u all
> All possible debugging has been turned off
> Rack2SW1#
> 03:26:10: OSPF: Send hello to 224.0.0.5 area 27 on Vlan27 from
> 162.2.27.7
>
>
> Regards,
> Ajay Prakash
>
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