From: David Hurtado (dei2viccie@hotmail.com)
Date: Mon May 03 2004 - 16:17:29 GMT-3
If the switch and the router have different MTU values, they will not become
OSPF neighbors.
To make that the router ignore the MTU requirement use the following command
in interface mode:
ip ospf mtu-ignore
HTH
>From: Richard Dumoulin <richard.dumoulin@vanco.es>
>Reply-To: Richard Dumoulin <richard.dumoulin@vanco.es>
>To: "Charles T. Alexander" <charles.t.alexander@verizon.net>,
>ccielab@groupstudy.com
>Subject: RE: OSPF Neighbor Problem
>Date: Mon, 3 May 2004 15:50:52 +0100
>
>How are the 3550 and 3500XL connected ?
>
>Also have you checked the mtu of interface VLAN96 on the 3550 ?
>
>
>
>-----Original Message-----
>From: Charles T. Alexander [mailto:charles.t.alexander@verizon.net]
>Sent: lunes, 03 de mayo de 2004 16:29
>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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