From: John Matijevic (matijevi@bellsouth.net)
Date: Mon Aug 18 2003 - 10:34:14 GMT-3
Hello Seong,
I am glad it is working for you now. It looks like it was an mtu issue all
along as I had first mentioned. Scott Morris had mentioned the following:
It's not an MTU issue at all... Check out the IOS release you have. Bug
CSCdv61151 mentions this.
I want to correct Scott in that this was a MTU issue.
Even a quadruple CCIE can be wrong sometimes.
:)
Sincerely,
Matijevic
----- Original Message -----
From: "Seonghui" <Seonghui@vads.com>
To: "Scott Morris" <swm@emanon.com>; "'Mustafa M Bayramov'"
<spyroot@azeronline.com>; <ccielab@groupstudy.com>
Sent: Monday, August 18, 2003 5:22 AM
Subject: RE: cat3550 cannot establish ospf nei with router/s
> Yup, I got it working after deleting vlan.dat file and reloaded, followed
by
> set system mtu 1500 and another reload for it to take effect. OSPF works
> fine after that.
>
> But does every new switch comes with MTU 1518? I received 2 cat 35500 at
the
> same time, one by default is 1518 and the other one is 1500. Does it mean
> that we have to check the MTU size on a switch before enabling L3 routing
> protocols in the exam?
>
> part of troubleshooting huh :)
>
> Thank you all for your help.
>
> -----Original Message-----
> From: Scott Morris [mailto:swm@emanon.com]
> Sent: Monday, August 18, 2003 5:10 AM
> To: 'Mustafa M Bayramov'; 'seonghui'; ccielab@groupstudy.com
> Subject: RE: cat3550 cannot establish ospf nei with router/s
>
>
> I would agree... Before an RMA, do a 'write erase' and 'del vlan.dat'
> then reload the sucker and see what happens.
>
> Karma? :)
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Mustafa M Bayramov
> Sent: Sunday, August 17, 2003 1:13 PM
> To: 'seonghui'; 'Scott Morris'; ccielab@groupstudy.com
> Subject: RE: cat3550 cannot establish ospf nei with router/s
>
>
> Make delete vlan.dat and you will see switch will set default MTU 1518
>
> To fix this you can change system MTU ( need restart switch ) Adjust MTU
> per VLAN. Adjust MTU for SWI interface. Set ip ospf mtu-ignore for ospf
> on both routers.
>
> Regards
>
>
> Mustafa M Bayramov
>
> CISSP
> CCNP,CCDP,Cisco Security Specialist
> Network engineer and security analyst
>
> Azercell Telecom J.V.
>
> "I know nothing except the fact of my ignorance." Socrates
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> seonghui
> Sent: Saturday, August 16, 2003 11:20 PM
> To: 'Scott Morris'; ccielab@groupstudy.com
> Subject: RE: cat3550 cannot establish ospf nei with router/s
>
> 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
> > > >
> > > >
> > > >
> _______________________________________________________________________
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