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VLANs and routing with layer 2 Cisco 2960G

cwellsatl
cwellsatl asked
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Last Modified: 2012-05-11
I have a network with five Layer 2 2960G switches. We also have an old Cisco 4000 Core layer 3 switch which have several VLAN's for our phones and related networking equipment and intervlan routing enabled. Up until now the 2960s have been flat with a single default VLAN. But now I need to create new VLANS on all devices as I need to change the internal IP range of the network to a new scheme. The plan is to implement this new scheme over a matter of months with devices slowly changing their IP address to the new scheme.

I set the ports that connect to each of the switches to Trunking and I have enabled VTP communication between all the switches and the 2960s all show the VLANs that they received from the 4000.

So what I need is to be able to do is have all of the ports on the 2960s to be members of two vlans at the same time. That way devices can be changed to the new scheme at anytime without having to reconfigure ports for vlans as they are needed.

I have tried several things but cant get them to work. Here is an example of what one of the ports looks like on the 2960s now.

interface GigabitEthernet0/1
 switchport trunk allowed vlan 1,10
 spanning-tree portfast

Here is a SHOW VLAN from the same switch

2960G-1#sh vlan

VLAN Name                             Status    Ports
---- -------------------------------- --------- -------------------------------
1    default                          active    Gi0/1, Gi0/2, Gi0/3, Gi0/4
                                                Gi0/5, Gi0/6, Gi0/7, Gi0/8
                                                Gi0/9, Gi0/10, Gi0/11, Gi0/12
                                                Gi0/13, Gi0/14, Gi0/15, Gi0/16
                                                Gi0/17, Gi0/18, Gi0/19, Gi0/20
                                                Gi0/21, Gi0/22, Gi0/23, Gi0/24
                                                Gi0/25, Gi0/26, Gi0/27, Gi0/28
                                                Gi0/29, Gi0/30, Gi0/31, Gi0/32
                                                Gi0/33, Gi0/34, Gi0/35, Gi0/36
                                                Gi0/37, Gi0/38, Gi0/39, Gi0/40
                                                Gi0/41, Gi0/42, Gi0/43, Gi0/44
                                                Gi0/45, Gi0/46, Gi0/47
10   VLAN0010                         active
15   VLAN0015                         active
20   VLAN0020                         active
30   VLAN0030                         active
45   VLAN0045                         active
1002 fddi-default                     act/unsup
1003 token-ring-default               act/unsup
1004 fddinet-default                  act/unsup
1005 trnet-default                    act/unsup

VLAN Type  SAID       MTU   Parent RingNo BridgeNo Stp  BrdgMode Trans1 Trans2
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------
1    enet  100001     1500  -      -      -        -    -        0      0
10   enet  100010     1500  -      -      -        -    -        0      0
15   enet  100015     1500  -      -      -        -    -        0      0
20   enet  100020     1500  -      -      -        -    -        0      0
30   enet  100030     1500  -      -      -        -    -        0      0
45   enet  100045     1500  -      -      -        -    -        0      0
1002 fddi  101002     1500  -      -      -        -    -        0      0
1003 tr    101003     1500  -      -      -        -    srb      0      0
1004 fdnet 101004     1500  -      -      -        ieee -        0      0
1005 trnet 101005     1500  -      -      -        ibm  -        0      0

Remote SPAN VLANs
------------------------------------------------------------------------------


Primary Secondary Type              Ports
------- --------- ----------------- ------------------------------------------
Thanks in advance for any assistance
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