Re: OSPF Error " EXSTART to DOWN "

but you have to reload if you changed system mtu !!

On Sat, Apr 11, 2009 at 9:41 AM, swm_at_emanon.com <swm_at_emanon.com> wrote:

> MTU sizes need to match. You may instead use the "ip ospf mtu-ignore"
> command
> on the side with the lower MTU.
>
> HTH,
>
> Scott
>
>
> ---- Message from Paul Adams <ccie.paul_at_gmail.com> at 2009-04-11 09:26:26
> ------
> >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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Received on Sat Apr 11 2009 - 09:47:18 ART