From: seonghui (seonghui@vads.com)
Date: Sat Aug 16 2003 - 15:34:09 GMT-3
Hi,
My cat3550 default MTU size is 1518. Have not changed the MTU size since day
1 I got the switch. BTW, how do i set the MTU back to 1500? I tried system
mtu 1500 but it doesn't change.
sw1#sh int vlan 10
Vlan3 is up, line protocol is up
Hardware is EtherSVI, address is 000d.285d.d700 (bia 000d.285d.d700)
Internet address is 10.10.10.1/24
MTU 1518 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:02, output 00:00:02, 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 ouxtput rate 0 bits/sec, 0 packets/sec
1386 packets input, 107266 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
1374 packets output, 100072 bytes, 0 underruns
0 output errors, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
sw1#sh ver
Cisco Internetwork Operating System Software
IOS (tm) C3550 Software (C3550-I5Q3L2-M), Version 12.1(13)EA1a, RELEASE
SOFTWARE (fc1)
Copyright (c) 1986-2003 by cisco Systems, Inc.
Compiled Tue 25-Mar-03 23:42 by yenanh
Image text-base: 0x00003000, data-base: 0x007C34B0
ROM: Bootstrap program is C3550 boot loader
sw1 uptime is 9 hours, 12 minutes
System returned to ROM by power-on
System image file is
"flash:c3550-i5q3l2-mz.121-13.EA1a/c3550-i5q3l2-mz.121-13.EA1a.bin"
cisco WS-C3550-24 (PowerPC) processor (revision J0) with 65526K/8192K bytes
of memory.
Processor board ID CAT0720X0T4
Last reset from warm-reset
Bridging software.
Running Layer2/3 Switching Image
Regards - SH
-----Original Message-----
From: MMoniz [mailto:ccie2002@tampabay.rr.com]
Sent: Sunday, August 17, 2003 2:20 AM
To: seonghui; 'John Matijevic'; ccielab@groupstudy.com
Subject: RE: cat3550 cannot establish ospf nei with router/s
It should be 1500. It looked like an MTU mismatch except the debugs would
normally show it.
22:38:05: OSPF: Send DBD to 133.5.5.5 on Serial0 seq 0xF5F opt 0x42 flag 0x7
len 32
22:38:05: OSPF: Retransmitting DBD to 133.5.5.5 on Serial0 [11]
22:38:05: OSPF: Rcv DBD from 133.5.5.5 on Serial0 seq 0x2122 opt 0x42 flag
0x7 len 32 mtu 1500 state EXSTART
22:38:05: OSPF: Nbr 133.5.5.5 has larger interface MTU
R3#
This is default on my 3550
VDL-CAT#sho in vlan 2
Vlan2 is up, line protocol is up
Hardware is EtherSVI, address is 000b.fdf0.ba00 (bia 000b.fdf0.ba00)
Internet address is 133.5.23.8/24
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
What code are you running on your Cat?
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
seonghui
Sent: Saturday, August 16, 2003 2:05 PM
To: 'John Matijevic'; ccielab@groupstudy.com
Subject: RE: cat3550 cannot establish ospf nei with router/s
Hi Matijevic,
MTU on router int fa0/0 is of course 1500 while MTU on vlan 10 is 1518. I
tried changing them but router doesn't allow me to do so.
any clue?
regards - SH
-----Original Message-----
From: John Matijevic [mailto:matijevi@bellsouth.net]
Sent: Sunday, August 17, 2003 1:55 AM
To: seonghui; ccielab@groupstudy.com
Subject: Re: cat3550 cannot establish ospf nei with router/s
Hello Seong,
Please check the mtu on the interface on the vlan interface as well as the
interface on the router to make sure that the mtu is the same. ex. sh ip int
e0, or sh ip int vlan 20.
Please post results.
Sincerely,
Matijevic
----- Original Message -----
From: "seonghui" <seonghui@vads.com>
To: "'John Matijevic'" <matijevi@bellsouth.net>; <ccielab@groupstudy.com>
Sent: Saturday, August 16, 2003 1:42 PM
Subject: RE: cat3550 cannot establish ospf nei with router/s
> Hi Matijevic,
>
> I tried that earlier, but the result is the same.
>
> regards - SH
>
> -----Original Message-----
> From: John Matijevic [mailto:matijevi@bellsouth.net]
> Sent: Sunday, August 17, 2003 1:36 AM
> To: seonghui; ccielab@groupstudy.com
> Subject: Re: cat3550 cannot establish ospf nei with router/s
>
>
> Hello Seong,
> Could you try putting ip ospf priority 0 under vlan interface on switch.
> Please post results.
> Sincerely,
> Matijevic
> ----- Original Message -----
> From: "seonghui" <seonghui@vads.com>
> To: <ccielab@groupstudy.com>
> Sent: Saturday, August 16, 2003 1:00 PM
> Subject: cat3550 cannot establish ospf nei with router/s
>
>
> > Hi group,
> >
> > I have been 'haunted' by this problem for the past two days. Here the
> > problem goes...
> >
> > I have a router conneted to a Cat3550. router fa0/0 (ip address
> > 10.10.10.1/24) is connected to port fas0/1 (vlan 10) on cat3550. I would
> > like cat3550 to establish ospf neighbour with the router and hence, I
> > created an Interface vlan 10 with ip address 10.10.10.2/24. However, the
> > router and the cat3550 just cannot form adjacency. Below is the debug
> > message:
> >
> > 07:28:30: OSPF: rcv. v:2 t:1 l:48 rid:10.10.10.1 aid:0.0.0.10 chk:7E15
> aut:0
> > auk: from Vlan10
> > 07:28:30: OSPF: Rcv hello from 10.10.10.1 area 11 from Vlan10 10.10.10.2
> > 07:28:30: OSPF: End of hello processing
> > 07:28:31: OSPF: rcv. v:2 t:2 l:32 rid:10.10.10.1 aid:0.0.0.10 chk:21B2
> aut:0
> > auk: from Vlan10
> > 07:28:31: OSPF: Rcv DBD from 10.10.10.1 on Vlan10 seq 0x2D3 opt 0x42
flag
> > 0x7 len 32 mtu 1500 state EXSTART
> > 07:28:31: OSPF: First DBD and we are not SLAVE
> > 07:28:31: OSPF: Retransmitting DBD to 10.10.10.1 on Vlan10
> > 07:28:31: OSPF: 10.10.10.1 address 10.10.10.2 on Vlan10 is dead, state
> DOWN
> > 07:28:31: %OSPF-5-ADJCHG: Process 1, Nbr 10.10.10.1 on Vlan10 from
EXSTART
> > to DOWN, Neighb or Down: Too many DBD retransmitions
> > 07:28:31: OSPF: Neighbor change Event on interface Vlan10
> > 07:28:36: OSPF: Rcv DBD from 10.10.10.1 on Vlan10 seq 0x2D3 opt 0x42
flag
> > 0x7 len 32 mtu
> > 1500 state DOWN
> > 07:28:36: OSPF: Nbr state is less than INIT
> >
> > I tried running other routing protocol between the switch and the
router,
> it
> > worked fine. Can some body please tell me what's the problem with ospf?
> >
> > Thanks,
> > SH
> >
> >
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