From: seonghui (seonghui@vads.com)
Date: Sun Aug 17 2003 - 00:20:16 GMT-3
Hi Scott,
OK, this sounds reasonable. But I have tried the same setting and config. on
another identical cat3550 switch, running the same IOS code
(flash:c3550-i5q3l2-mz.121-13.EA1a/c3550-i5q3l2-mz.121-13.EA1a.bin) and it
works! OSPF nei adj formed almost instantly with the router...this puzzles
me. can i just send the switch for RMA?
anyway, thanks group for your help. I better leave this problem alone, else
i'll be wasting too much time and never move on.
regards-SH
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Scott Morris
Sent: Sunday, August 17, 2003 3:04 AM
To: 'John Matijevic'; 'MMoniz'; 'seonghui'; ccielab@groupstudy.com
Subject: RE: cat3550 cannot establish ospf nei with router/s
It's not an MTU issue at all... Check out the IOS release you have.
Bug CSCdv61151 mentions this.
I just set it up on a 3550 and three different routers (2610 and two
different 3620's) and ospf came up immediately. No MTU playing, nothing
funky, nothing bizarre, just simple network command and *POOF* there
were neighbors and routes and reachability!
The switch is wholly aware of different things because it's a switch.
:) Looking at show interface, the MTU should be 1500 on everything.
1518 is allowed, but that's not a L3 MTU, that's the L3 MTU + L2 header.
Even doing show interface on a trunk port, you'll see the same MTU even
though it now expects 18 additional bytes plus some extra for the
trunking (depending on your protocol). SO.... There shouldn't be a
need in this instance to change MTU at all.
If you did, that's what's messed up. If you didn't, look at the bug id
referenced above. Try a different IOS.
HTH,
Scott
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
John Matijevic
Sent: Saturday, August 16, 2003 2:25 PM
To: MMoniz; seonghui; ccielab@groupstudy.com
Subject: Re: cat3550 cannot establish ospf nei with router/s
MMoniz,
MTU on router int fa0/0 is of course 1500 while MTU on vlan 10 is 1518.
This looks like a mtu mismatch, I was having him change the mtu on vlan
10 to 1500 to match. We are still waiting for the results. Sincerely,
Matijevic
----- Original Message -----
From: "MMoniz" <ccie2002@tampabay.rr.com>
To: "seonghui" <seonghui@vads.com>; "'John Matijevic'"
<matijevi@bellsouth.net>; <ccielab@groupstudy.com>
Sent: Saturday, August 16, 2003 2:19 PM
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
> > >
> > >
> > >
This archive was generated by hypermail 2.1.4 : Tue Sep 02 2003 - 18:54:00 GMT-3