Re: OSPF Error " EXSTART to DOWN "

more than likely an MTU mismatch. You can make sure they match or put "ip ospf mtu-ignore" on the end with the smaller MTU

"He not busy being born is busy dying" -- Dylan

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-----Original Message-----
From: Ruhann <groupstudy_at_ru.co.za>

Date: Sat, 11 Apr 2009 22:14:40
To: Paul Adams<ccie.paul_at_gmail.com>
Cc: Cisco certification<ccielab_at_groupstudy.com>
Subject: Re: OSPF Error " EXSTART to DOWN "

try the following and see why you router is not happy with ospf
"debug ip ospf adj"
"clear ip ospf proccess"

alternatively leave your switch system mtu at 1504 and just change you
routing mtu to 1500 on your switch:
#system mtu routing 1500

regards
On Sat, Apr 11, 2009 at 8:26 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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>
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>

-- 
<ruhann>
Blogs and organic groups at http://www.ccie.net