???intervlan on catalyst 2950 with 2600 router???

Unanswered Question
Jul 27th, 2010

Hi All,

I´m trying build a very simple scenary using intervlan routing with a router 2621XM with a Catalyst 2950.

My router is connected using fastethernet 0/1 to the fastethernet 0/2 on switch.

Link lights are up, but still can´t get access from router to the switch and can´t see at CPD command as well.

Follow the configuration to both equipments :

Router

interface FastEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface FastEthernet0/1
no ip address
duplex auto
speed auto
!
interface FastEthernet0/1.1
encapsulation dot1Q 1 native
ip address 10.1.1.1 255.255.255.0
!
interface FastEthernet0/1.400
encapsulation dot1Q 400
ip address 10.1.4.1 255.255.255.0
!
interface FastEthernet0/1.500
encapsulation dot1Q 500
ip address 10.1.5.1 255.255.255.0

Switch

switch_lab#sh start
Using 1663 out of 32768 bytes
!
version 12.1
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname switch_lab
!
!
ip subnet-zero
!
vtp mode transparent
!
spanning-tree mode pvst
no spanning-tree optimize bpdu transmission
spanning-tree extend system-id
!
!
!
!
vlan 400
name data
!
vlan 500
name voice
!
interface FastEthernet0/1
!
interface FastEthernet0/2
switchport mode trunk
!
interface FastEthernet0/3
!
interface FastEthernet0/4
switchport access vlan 400
switchport mode access
switchport voice vlan 500
spanning-tree portfast
!
interface FastEthernet0/5
switchport access vlan 400
switchport mode access
switchport voice vlan 500
spanning-tree portfast
!        
interface FastEthernet0/6
switchport access vlan 400
switchport mode access
!
interface FastEthernet0/7
!
interface FastEthernet0/8
!
interface FastEthernet0/9
!
interface FastEthernet0/10
!
interface FastEthernet0/11
!
interface FastEthernet0/12
!
interface FastEthernet0/13
!
interface FastEthernet0/14
!
interface FastEthernet0/15
!
interface FastEthernet0/16
!
interface FastEthernet0/17
!
interface FastEthernet0/18
!
interface FastEthernet0/19
!
interface FastEthernet0/20
!
interface FastEthernet0/21
!
interface FastEthernet0/22
!
interface FastEthernet0/23
!
interface FastEthernet0/24
!
interface Vlan1
ip address 10.1.1.2 255.255.255.0
no ip route-cache
!
interface Vlan400
ip address 10.1.4.2 255.255.255.0
no ip route-cache
shutdown
!
interface Vlan500
ip address 10.1.5.2 255.255.255.0
no ip route-cache
shutdown
!
ip http server
!
line con 0
line vty 5 15
!
!
end

Does can somebody explain or help to get way to sort out it ??

Thanks

AB

I have this problem too.
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Antonio Brandao Tue, 07/27/2010 - 04:00

i don´t now why, but is working now I just moved on router

from FE 0/0 to FE 0/1 and worked.

I think is some think on 2600 router series that don´t let me do it using FE 0/0

Thanks a lot

AB

Leo Laohoo Tue, 07/27/2010 - 15:35

That's because your dot1q trunking configuration for your router are all in Fa 0/1 while Fa 0/0 is also "shutdown".

Antonio Brandao Wed, 07/28/2010 - 00:56

Sorry ,

Did some mistake while wrote previous post.

If I try same configuration using FE 0/1 will not work, but using FE 0/0 works fine.

Thats the conf is working now

interface FastEthernet0/0
no ip address
duplex auto
speed auto
!
interface FastEthernet0/0.1
encapsulation dot1Q 1 native
ip address 10.1.1.1 255.255.255.0
!
interface FastEthernet0/0.2
encapsulation dot1Q 2
ip address 10.1.2.1 255.255.255.0
!

Thks

Antonio

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