Re: OSPF Error " EXSTART to DOWN "

chang the mtu to be the same as the router in the switch 1500byte

but you have to reload the switch after applying the command

HTH

Salah

On Sat, Apr 11, 2009 at 9:52 AM, Paul Adams <ccie.paul_at_gmail.com> wrote:

> Thanks.
>
> I already have ip ospf mtu-ignore.
>
> So what could be the other possibility
>
> On Sat, Apr 11, 2009 at 9:35 AM, Salah ElShekeil <
> salah.elshekeil_at_gmail.com> wrote:
>
>> check out system mtu !!
>>
>>
>> use ip ospf mtu ign interface level command
>> On Sat, Apr 11, 2009 at 9:26 AM, Paul Adams <ccie.paul_at_gmail.com>wrote:
>>
>>> Hello GS,
>>>
>>> Time to Time I start getting the notification
>>>
>>> *2d22h: %OSPF-5-ADJCHG: Process 1, Nbr 4.4.3.3 on Vlan12 from EXSTART to
>>> DOWN, Neighbor Down: Too many retransmissions
>>> 2d22h: %OSPF-5-ADJCHG: Process 1, Nbr 4.4.3.3 on Vlan12 from DOWN to
>>> DOWN,
>>> Neighbor Down: Ignore timer expired
>>> *
>>> and I start losing routes when I see " SH IP ROUTE "
>>>
>>>
>>> SW1#sh ip ospf
>>> neighbor
>>>
>>>
>>>
>>> Neighbor ID Pri State Dead Time Address
>>> Interface
>>> 4.4.3.3 1 FULL/BDR 00:00:32 4.4.12.3
>>> Vlan12
>>>
>>> SW1#sh system
>>> mtu
>>>
>>> System MTU size is 1504 bytes
>>> R3#sh ip ospf
>>> neighbor
>>>
>>>
>>>
>>> Neighbor ID Pri State Dead Time Address
>>> Interface
>>> 4.4.7.7 1 FULL/DR 00:00:30 4.4.12.7
>>> FastEthernet0/0
>>>
>>> R3#sh int fastEthernet
>>> 0/0
>>>
>>> FastEthernet0/0 is up, line protocol is
>>> up
>>>
>>> Hardware is MV96340 Ethernet, address is 001d.46f3.b838 (bia
>>> 001d.46f3.b838)
>>> Internet address is 4.4.12.3/24
>>>
>>> MTU 1500 bytes, BW 100000 Kbit, DLY 100
>>> usec,
>>>
>>> reliability 255/255, txload 1/255, rxload
>>> 1/255
>>>
>>> Encapsulation ARPA, loopback not
>>> set
>>>
>>> Keepalive set (10
>>> sec)
>>>
>>> Full-duplex, 100Mb/s,
>>> 100BaseTX/FX
>>>
>>> ARP type: ARPA, ARP Timeout
>>> 04:00:00
>>>
>>> Last input 00:00:03, output 00:00:01, output hang
>>> never
>>>
>>> Last clearing of "show interface" counters
>>> never
>>>
>>> Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops:
>>> 0
>>> Queueing strategy:
>>> fifo
>>>
>>> Output queue: 0/40
>>> (size/max)
>>>
>>> 5 minute input rate 0 bits/sec, 0
>>> packets/sec
>>>
>>> 5 minute output rate 0 bits/sec, 0
>>> packets/sec
>>>
>>> 1151 packets input, 378891
>>> bytes
>>>
>>> Received 1107 broadcasts, 0 runts, 0 giants, 0
>>> throttles
>>>
>>> 0 input errors, 0 CRC, 0 frame, 0 overrun, 0
>>> ignored
>>>
>>> 0
>>> watchdog
>>>
>>> 0 input packets with dribble condition
>>> detected
>>>
>>> 9141 packets output, 882911 bytes, 0
>>> underruns
>>>
>>> 0 output errors, 0 collisions, 0 interface
>>> resets
>>>
>>> 0 unknown protocol
>>> drops
>>>
>>> 0 babbles, 0 late collision, 0
>>> deferred
>>>
>>> 0 lost carrier, 0 no
>>> carrier
>>>
>>> 0 output buffer failures, 0 output buffers swapped out
>>>
>>>
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Received on Sat Apr 11 2009 - 09:57:38 ART