Intervlan routing using One L3 switch

[prajithtr_2]

haii everybody,

    Suppose we have two layer2 switches(2960) and one multi layer switch(catalyst3560) .These two layer2 switches carry 3 vlans (vlan20,vlan30,vlan40).and there is no router or other layer 3 device .with these devices is it  possible to set up intervlan routing.if possible could you pls give a sample configuration.

Thanks

[dschoolcraft · Accepted solution]

Configuration for the 3560
!
!
!enable ip routing on the 3560
!
ip routing
system mtu routing 1500
!
! Note the IP's Listed here would need to be your Default Gateways on the Hosts
!
interface vlan 1
ip address 192.168.1.1 255.255.255.0
!
interface vlan 10
ip address 192.168.2.1 255.255.255.0
!
!
interface vlan 20
ip address 192.168.3.1 255.255.255.0
!
!
!
!Enable a routing protocol for intervlan routing
!
router eigrp 1
network 192.168.1.0
network 192.168.2.0
network 192.168.3.0
!
!
! NOTE IF you have a non Gig switch it would be FastEthernet0/1 
!
interface GigabitEthernet0/1
description link to 2960 1
switchport trunk encap dot1q
switchport mode trunk

interface GigabitEthernet0/1
description link to 2960 2
switchport trunk encap dot1q
switchport mode trunk

#######################
2960 Configuration

interface GigabitEthernet0/1
description trunk to 3560 port g0/1
switchport trunk encap dot1q
switchport mode trunk

#######################

2960 2 config

interface GigabitEthernet0/2
description trunk to 3560 port g0/2
switchport trunk encap dot1q
switchport mode trunk

Then assign your switchports on the 2960's as needed

Interface GigabitEthernet0/Some number
switchport access vlan 20
switchport mode access
spanning-tree portfast

Substitute your interface names & IP's as necessary

[prajithtr_2]

hai,

   thank you...for  your immediate reply.your answar was defenitely helpfull.

[glen.grant]

  Yes a 3560 will do your intervlan routing and a lot faster than a normal router also .

[Naveen Kumar Rajaharia]

Perform below configs

--------------------------------

L2 Switch
------------
1) Create L2 vlans
2) Configure default gateway as L3 switch
3) Create L2 trunk to the L3 switch

L3 Switch
------------
1) Create Vlan SVI, assign IP address
2) Create L2 trunk connecting to L2 Switch
3) Advertise the network under protocol in L3 switch