11-01-2008 02:51 AM - edited 03-06-2019 02:15 AM
Hi,
I would like to config cisco switch 3750 with VLAN. any sample config link?
I attached the vlan design.
rdgs
Solved! Go to Solution.
11-01-2008 03:07 AM
Hello Anita,
the steps are the following:
a) L2 broadcast domain creation
! vlan 1 exists by default
conf t
vlan 2
vlan 3
b) associate L2 ports to Vlans
conf t
int f0/10
switchport
desc here you connect a PC/server in Vlan2
switchport access vlan 2
switchport mode access
ports are in vlan1 by default so you need to change config on ports that are to be placed in Vlan2 and Vlan3.
if you need trunk ports
int f0/20
switchport
switchport trunk protocol dot1q
switchport mode trunk
switchport trunk allowed vlan 1-3
c) providing L3 services
create a logical L3 interface called SVI = switched Virtual interface
int vlan 1
ip address x.x.x.x mask
no shut
do the same with vlan2 and vlan3 using the correct subnets remember the no shut.
the SVI are up if at least one l2 port for each Vlan is in STP forwarding state including trunk ports
Hope to help
Giuseppe
11-01-2008 06:02 AM
Anita
For this port
int gi1/0/1
no switchport
ip address 192.168.1.1 255.255.255.0
This will make the port a routed port connected to the 192.168.1.0/24 network.
Jon
11-01-2008 07:46 AM
Anita
Looks fine except for the connection to 192.168.1.0/24 network. You can either
1) Use a vlan to connect so your config would be
int gi 1/0/1
switchport access vlan 1
interface Vlan1
ip address 192.168.1.1 255.255.255.0
OR
2) Just use a routed port
int gi1/0/1
no switchport
ip address 192.168.1.1 255.255.255.0
Note with this option you don't need vlan 1 interface so
int vlan 1
shut
It all depends on what is on the 192.168.1.0/24 network. If you have pc's that are connected into the 3750 switch and are on the 192.168.1.0/24 network then use option 1).
Note - it may be better not to use vlan 1 at all so in actual fact option 1 would look like
int gi 1/0/1
switchport access vlan 5
interface Vlan5
ip address 192.168.1.1 255.255.255.0
If you do use vlan 5 make sure you create it at layer 2 ie.
3750(config)# vlan 5
If there are no clients/PC etc. on 192.168.1.0/24 network then you could use option 2.
Jon
11-01-2008 03:07 AM
Hello Anita,
the steps are the following:
a) L2 broadcast domain creation
! vlan 1 exists by default
conf t
vlan 2
vlan 3
b) associate L2 ports to Vlans
conf t
int f0/10
switchport
desc here you connect a PC/server in Vlan2
switchport access vlan 2
switchport mode access
ports are in vlan1 by default so you need to change config on ports that are to be placed in Vlan2 and Vlan3.
if you need trunk ports
int f0/20
switchport
switchport trunk protocol dot1q
switchport mode trunk
switchport trunk allowed vlan 1-3
c) providing L3 services
create a logical L3 interface called SVI = switched Virtual interface
int vlan 1
ip address x.x.x.x mask
no shut
do the same with vlan2 and vlan3 using the correct subnets remember the no shut.
the SVI are up if at least one l2 port for each Vlan is in STP forwarding state including trunk ports
Hope to help
Giuseppe
11-01-2008 03:13 AM
hi
Thanks, how to config the 192.168.1.1 to one of c3750 port?
rdgs
11-01-2008 03:16 AM
hi,
I would like 3750 act as router because there is no router on the LAN
rdgs
11-01-2008 06:02 AM
Anita
For this port
int gi1/0/1
no switchport
ip address 192.168.1.1 255.255.255.0
This will make the port a routed port connected to the 192.168.1.0/24 network.
Jon
11-01-2008 06:23 AM
Hi Jon,
do I need to config
"switchport trunk allowed vlan 10,20 " similar conf to assosicate all VLAN to 192.168.1.1 gi 1/0/1? It seems that the vlan cannot go to 192.168.1.0 segment
rdgs
11-01-2008 06:27 AM
Anita
No you don't want to use the switchport trunk allowed vlan 10,20 command. The port is a routed port so it isn't a switchport at all.
What is on 192.168.1.0/24 network. In other words what are you trying to get to and from.
If you have clients on the 192.168.1.0/24 network then you just set their default-gateway to be 192.168.1.1 and they will then be able to get to the vlans.
Anything on the vlans will also be able to get to anything on 192.168.1.0/24 network.
However if there are other networks/routers connected to the 192.168.1.0/24 network then we will need to update the routing tables.
Jon
11-01-2008 07:38 AM
Hi Jon,
my config is below. any missing? All VLAN PCs will point to 172.16.x.1 as the default gateway.
rdgs
!Switch
interface FastEthernet 1/0/2
switchport access vlan 2
switchport mode access
interface FastEthernet 1/0/3
switchport access vlan 3
switchport mode access
interface FastEthernet 1/0/4
switchport access vlan 4
switchport mode access
! connect to 192.168.1.0 segment
int gi 1/0/1
no switchport
interface Vlan1
ip address 192.168.1.1 255.255.255.0
interface Vlan2
ip address 172.16.1.1 255.255.255.0
interface Vlan3
ip address 172.16.2.1 255.255.255.0
interface Vlan4
ip address 172.16.3.1 255.255.255.0
!
11-01-2008 07:46 AM
Anita
Looks fine except for the connection to 192.168.1.0/24 network. You can either
1) Use a vlan to connect so your config would be
int gi 1/0/1
switchport access vlan 1
interface Vlan1
ip address 192.168.1.1 255.255.255.0
OR
2) Just use a routed port
int gi1/0/1
no switchport
ip address 192.168.1.1 255.255.255.0
Note with this option you don't need vlan 1 interface so
int vlan 1
shut
It all depends on what is on the 192.168.1.0/24 network. If you have pc's that are connected into the 3750 switch and are on the 192.168.1.0/24 network then use option 1).
Note - it may be better not to use vlan 1 at all so in actual fact option 1 would look like
int gi 1/0/1
switchport access vlan 5
interface Vlan5
ip address 192.168.1.1 255.255.255.0
If you do use vlan 5 make sure you create it at layer 2 ie.
3750(config)# vlan 5
If there are no clients/PC etc. on 192.168.1.0/24 network then you could use option 2.
Jon
11-01-2008 07:48 AM
Hi Jon,
my config is below. any missing? All VLAN PCs will point to 172.16.x.1 as the default gateway. I also enable the DHCP service
any advice?
rdgs
!Switch
interface FastEthernet 1/0/2
switchport access vlan 2
switchport mode access
interface FastEthernet 1/0/3
switchport access vlan 3
switchport mode access
interface FastEthernet 1/0/4
switchport access vlan 4
switchport mode access
! connect to 192.168.1.0 segment
int gi 1/0/1
no switchport
interface Vlan1
ip address 192.168.1.1 255.255.255.0
interface Vlan2
ip address 172.16.1.1 255.255.255.0
ip helper address 192.168.1.254
interface Vlan3
ip address 172.16.2.1 255.255.255.0
ip helper address 192.168.1.254
interface Vlan4
ip address 172.16.3.1 255.255.255.0
ip helper address 192.168.1.254
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