From: Devi Mallampalli (Devi.Mallampalli@chubb.com.au)
Date: Mon May 03 2004 - 21:10:57 GMT-3
Hi All,
Whenever I see this kind of scenario on the exam, Can I "preempt" this
possibility/problem by configuring " ip ospf mtu-ignore" command. So
that we can eliminate this problem from the very beginning with out
having to spend time on T/Sing on why my adjacencies are not coming up.
Is this allowed from proctor point of view ?
Regards
Devi.
-----Original Message-----
From: Charles T. Alexander [mailto:charles.t.alexander@verizon.net]
Sent: Tuesday, 4 May 2004 6:46 AM
To: OzgurG@garanti.com.tr
Cc: ccielab@groupstudy.com
Subject: Re: OSPF Neighbor Problem - Yep It was MTU
Thanks all. Yes it was the MTU. I hope this is the last time that
little dog bites me.
OzgurG@garanti.com.tr wrote:
> might be because of an ospf mtu mismatch.
> try system mtu 1500 and reload cat.
>
> and do you see type 7 flags in ospf debugs?
> if this is the case you can try ip ospf pri 0 on Cat.
> i remember i read this somewhere.
>
> in my case, this was because of a hardware failure,
>
> you can check sh int outputs to see if there are any errors.
>
> Ozgur #13237
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> Charles T. Alexander
> Sent: Monday, May 03, 2004 5:29 PM
> To: ccielab@groupstudy.com
> Subject: OSPF Neighbor Problem
>
> I am having problems getting an OSPF neighbor between r6 to cat 3550
> and r9 to cat 3550.
>
> r6----
> | |
> | cat3500XL --- cat 3550
> | |
> r9----
>
> c1#sho ip os neigh
>
> Neighbor ID Pri State Dead Time Address
> Interface
> 138.10.4.4 1 DOWN/DROTHER - 138.10.40.4
Vlan40
>
> 138.10.6.6 1 EXSTART/BDR 00:00:39 138.10.96.6
Vlan96
>
> 138.10.9.9 1 DOWN/DROTHER 00:00:33 138.10.96.9
Vlan96
>
> Here are extracts of the configs
> =========================================
> r6
>
> interface Loopback0
> ip address 138.10.6.6 255.255.255.0
> ip router isis
> !
> interface Loopback1
> ip address 206.1.1.1 255.255.255.224
> ip ospf network point-to-point
> !
> interface Loopback2
> ip address 206.1.1.33 255.255.255.224
> ip ospf network point-to-point
> !
> interface Ethernet0/0
> ip address 138.10.96.6 255.255.255.224
> !
> interface Serial1/1
> bandwidth 64
> ip address 138.10.69.6 255.255.255.240
> serial restart-delay 0
> !
> router ospf 1
> router-id 138.10.6.6
> log-adjacency-changes
> network 138.10.69.0 0.0.0.15 area 69
> network 138.10.96.0 0.0.0.31 area 0
> network 206.1.1.0 0.0.0.31 area 60
> network 206.1.1.32 0.0.0.31 area 60
> ======================================
> r9
>
> interface Loopback0
> ip address 138.10.9.9 255.255.255.0
> ip ospf network point-to-point
> !
> interface Loopback1
> ip address 209.1.1.1 255.255.255.224
> ip ospf network point-to-point
> !
> interface Loopback2
> ip address 209.1.1.33 255.255.255.224
> ip ospf network point-to-point
> !
> interface Ethernet0
> ip address 138.10.96.9 255.255.255.224
> !
> interface Serial0
> bandwidth 64
> ip address 138.10.69.9 255.255.255.240
> no fair-queue
> clockrate 64000
> !
> router ospf 1
> router-id 138.10.9.9
> log-adjacency-changes
> network 138.10.9.0 0.0.0.255 area 0
> network 138.10.69.0 0.0.0.15 area 69
> network 138.10.96.0 0.0.0.31 area 0
> network 209.1.1.0 0.0.0.31 area 90
> network 209.1.1.32 0.0.0.31 area 90
> =========================================
> cat 3550
>
> interface Loopback0
> ip address 138.10.10.10 255.255.255.0
> !
> interface Vlan40
> description vlan B
> ip address 138.10.40.10 255.255.255.0
> !
> interface Vlan96
> description vlan A
> ip address 138.10.96.10 255.255.255.224
> !
> router ospf 1
> router-id 138.10.10.10
> log-adjacency-changes
> network 138.10.40.0 0.0.0.255 area 0
> network 138.10.96.0 0.0.0.31 area 0
>
> ========================================
> cat 3500XL
>
> below are VLans
>
> c2#show vlan
> VLAN Name Status Ports
> ---- -------------------------------- ---------
> -------------------------------
> 1 default active Fa0/1, Fa0/2, Fa0/5,
> Fa0/8,
> Fa0/10, Gi0/1, Gi0/2
> 14 VLAN0014 active
> 30 VLAN-C active Fa0/3
> 40 VLAN-B active Fa0/4
> 70 VLAN-D active Fa0/7
> 96 VLAN-A active Fa0/6, Fa0/9
> 125 VLAN-E active
> 192 VLAN-F active
> 1002 fddi-default active
> 1003 token-ring-default active
> 1004 fddinet-default active
> 1005 trnet-default active
>
> !
>
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