Re: OSPF Error " EXSTART to DOWN "

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 - 09:35:56 ART