09-01-2005 09:01 AM - edited 03-02-2019 11:53 PM
Hi.
I have six 2059 switches with two GB ports each connected to a Dlink GB switch.
Theres only one vlan.(10.20.100.0/24)
Each switch has been given an ip address .
I am planning to intoduce a new subnet and do Ip routing with a 3550 switch. I follow the following steps -
1.make all the ports for the 3550 to dot1q.
2.the gb port on the 2950 switches i make them trunk allowing all vlans. I create the 2nd Vlan and give it a new address (10.20.101.1/24).
My problem is that the uplink does not come up. It comes up only when I am rebooting the 3550.
second problem is that when I do a no shut for vlan 2 then i have connectivity and the vlan1 shuts down automatically. can any one help please!
-----2950
interface FastEthernet0/47
switchport access vlan 2
!
interface FastEthernet0/48
switchport access vlan 2
!
interface GigabitEthernet0/1
!
interface GigabitEthernet0/2
switchport mode trunk
!
interface Vlan1
ip address 10.20.100.8 255.255.255.0
no ip route-cache
--More-- !
interface Vlan2
ip address 10.20.101.2 255.255.255.0
no ip route-cache
shutdown
------3550
!
interface Vlan1
10.20.100.12 255.255.255.0
!
interface Vlan2
ip address 10.20.101.1 255.255.255.0
!
ip default-gateway 10.20.100.1
ip classless
ip route 0.0.0.0 0.0.0.0 10.20.100.1
09-01-2005 09:30 AM
Is this two commands necessary?
add "switchport mode access" to each interface of vlan 2 on 2950 switch.
e.q.
interface FastEthernet0/27
switchport access vlan 2
switchport mode access
further, add "switchport mode trunk" to each trunk interface of 3550 switch.
e.q.
interface GigabitEthernet0/7
switchport trunk encapsulation dot1q
switchport mode trunk
no ip address
09-01-2005 09:41 AM
This has been covered many times here but here it is again , the 2950 can only have 1 ip address which is used to manage the switch and that is all , it is not a routing device . So you can have an address on either interface vlan 1 or vlan 2 not both . Delete the one you don't want . To create a vlan on a 2950 all you have to do is "config t" , vlan X where X is the vlan number you want to create . Do not do a "interface vlan X" this is to create layer 3 SVI to manage the switch only . On the 3550 you can create multiple interfaces because it is a layer3 routing device , but you still have to create a layer vlan the same way you do on a 2950 , then you would have to have a trunk link to the 2950 if you are running more than 1 vlan down the link .
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