Nd help connecting 3550 to 2950 with 2 vlans

[DSPG]

Hi everyone.

I'm not a Cisco person...I know the interface and I'm familiar with many of the commands, but I don't do this on a day-to-day basis (in fact, last time I logged into a switch was over a year ago).

Anyway, I have a corporate network (10.2.0.0) that has access to 2 VLANs (10.2.3.0 and 10.2.4.0) on a 2950 switch. The VLANs are named 3 and 4. All ports on the 2950 belong to one of these VLANs. People can access hosts connected to VLAN 3 and 4 from the corporate network.

Unfortunately, there is only 1 empty port available and since we had an extra 3550 laying around, I thought to myself, "Dude! Why not just connect it with a xover and shazam!" Turns out, it's not that easy. But I guess you knew that.

So, I created 2 VLANs on the 3550, called 3 and 4 (like the 2950). Hosts on VLAN 4 on the 3550 can ping hosts on VLAN 4 on the 2950 and vice versa. However, VLAN 4 hosts in the 3550 can't ping VLAN 3 hosts on the 2950, and corporate users can't access any hosts on the 3550.

What am I missing? Or, more importantly, what have I done wrong?

 

[burtsbees]

Is the port between the two set up as a trunk? Post sh run from both...what was doing the routing for the 2950 vlans?

Burt

 

[DSPG]

Here are the sh run from both switches:

2950
=================================================
cisco2950-1#sh run
Building configuration...

Current configuration : 3450 bytes
!
version 12.1
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname cisco2950-1
!
ip subnet-zero
!
spanning-tree mode pvst
no spanning-tree optimize bpdu transmission
spanning-tree extend system-id
!
!
interface FastEthernet0/1
switchport access vlan 3
switchport mode access
no ip address
spanning-tree portfast
.
.
.
.
.
interface FastEthernet0/12
switchport access vlan 3
switchport mode access
no ip address
spanning-tree portfast
!
interface FastEthernet0/13
switchport access vlan 4
switchport mode access
no ip address
spanning-tree portfast
.
.
.
.
.
interface FastEthernet0/20
switchport access vlan 4
switchport mode trunk
no ip address
spanning-tree portfast
!
interface FastEthernet0/21
switchport access vlan 4
switchport mode access
no ip address
spanning-tree portfast
!
interface FastEthernet0/22
switchport access vlan 4
switchport mode access
no ip address
spanning-tree portfast
!
interface FastEthernet0/23
switchport access vlan 4
switchport mode access
no ip address
spanning-tree portfast
!
interface FastEthernet0/24
switchport mode trunk
no ip address
!
interface Vlan1
no ip address
no ip route-cache
shutdown
!
interface Vlan3
ip address 10.2.3.254 255.255.255.0
no ip route-cache
!
interface Vlan4
no ip address
no ip route-cache
shutdown
!
ip default-gateway 10.2.3.1
ip http server
!
!
line con 0
exec-timeout 0 0
line vty 0 4
password **********
login
line vty 5 15
password **********
login
!
end

3550
=================================================
rc3550-1#sh run
Building configuration...

Current configuration : 6332 bytes
!
version 12.1
no service pad
service timestamps debug uptime
service timestamps log datetime
no service password-encryption
service sequence-numbers
!
hostname rc3550-1
!
ip subnet-zero
!
!
spanning-tree mode pvst
spanning-tree extend system-id
!
!
!
!
interface FastEthernet0/1
switchport access vlan 3
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/2
switchport access vlan 4
switchport trunk encapsulation dot1q
switchport mode trunk
spanning-tree portfast
!
interface FastEthernet0/3
switchport access vlan 3
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/4
switchport access vlan 4
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/5
switchport access vlan 3
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/6
switchport access vlan 4
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/7
switchport access vlan 3
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/8
switchport access vlan 4
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/9
switchport access vlan 3
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/10
switchport access vlan 4
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/11
switchport access vlan 3
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/12
switchport access vlan 4
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/13
switchport access vlan 3
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/14
switchport access vlan 4
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/15
switchport access vlan 3
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/16
switchport access vlan 4
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/17
switchport access vlan 3
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/18
switchport access vlan 4
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/19
switchport access vlan 3
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/20
switchport access vlan 4
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/21
switchport access vlan 3
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/22
switchport access vlan 4
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/23
switchport access vlan 3
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/24
switchport access vlan 4
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/25
switchport access vlan 3
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/26
switchport access vlan 4
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/27
switchport access vlan 3
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/28
switchport access vlan 4
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/29
switchport access vlan 3
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/30
switchport access vlan 4
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/31
switchport access vlan 3
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/32
switchport access vlan 4
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/33
switchport access vlan 3
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/34
switchport access vlan 4
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/35
switchport access vlan 3
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/36
switchport access vlan 4
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/37
switchport access vlan 3
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/38
switchport access vlan 4
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/39
switchport access vlan 3
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/40
switchport access vlan 4
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/41
switchport access vlan 3
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/42
switchport access vlan 4
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/43
switchport access vlan 3
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/44
switchport access vlan 4
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/45
switchport access vlan 3
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/46
switchport access vlan 4
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/47
switchport access vlan 3
switchport mode dynamic desirable
spanning-tree portfast
!
interface FastEthernet0/48
switchport access vlan 4
switchport mode dynamic desirable
spanning-tree portfast
!
interface GigabitEthernet0/1
switchport mode dynamic desirable
spanning-tree portfast
!
interface GigabitEthernet0/2
switchport trunk encapsulation dot1q
switchport mode trunk
!
interface Vlan1
no ip address
no ip route-cache
shutdown
!
interface Vlan4
description Management
ip address 10.2.4.250 255.255.255.0
!
ip default-gateway 10.2.0.1
ip classless
ip http server
!
snmp-server community ******** RO
!
line con 0
line vty 0 4
password ********
login
line vty 5 15
password ********
login
!
!
end

 

[burtsbees]

On the 2950...

switch#conf t
switch(config)#int vlan3
switch(config-if)#no ip add
switch(config-if)#exit
switch(config)#int vlan1
switch(config-if)#ip address 10.2.3.254 255.255.255.0
switch(config-if)#no shut
switch(config-if)#end
switch#
You cannot make an access vlan an SVI also---that's for the management vlan. The 3550 is a layer 3 switch, so you can either attach the 2950 straight to an access port and make that port part of the same vlan, or connect them both to a trunk port with 802.1Q, and match the stp version, but make sure the 2950 is in CLIENT MODE FIRST!!! If it's in server mode, it could wipe the entire vlan config! Also, after connecting them together, go on and make the 3550 the vtp server---the vtp domain name and passwords must match as well.

Burt