switch routing from the router to switch for local lan

[No2984932]

Hi,

I have some dilema , I need to do some changes on network.

Network isn't big but there is a few vlans. I have router on which is configured "ruting on stik" for those vlans, behind is cisco switch 2950 and so on.

Now I need to insert one switch 3560 instead first switch and on that 3560 I wont to enabling routing between vlans.

the part that confuses me is that on router is configure Ip NAT and dhcp for some vlans. Dhcp isn't a problem but I dont understend how NAT will work.

And one more thing , why there is no route in routing table , this is output:

SW3560#sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route

Gateway of last resort is not set

...

!
interface Vlan1
 no ip address
 shutdown
!
interface Vlan2
 ip address 172.16.2.1 255.255.255.0
!
interface Vlan3
 ip address 172.16.3.1 255.255.255.0
!
interface Vlan4
 ip address 172.16.4.1 255.255.255.0
!
interface Vlan5
 no ip address
!
interface Vlan6
 no ip address

SW3560#sh version
Cisco IOS Software, C3560 Software (C3560-IPBASEK9-M), Version 12.2(55)SE9, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2014 by Cisco Systems, Inc.
Compiled Mon 03-Mar-14 22:36 by prod_rel_team
Image text-base: 0x01000000, data-base: 0x02D00000

ROM: Bootstrap program is C3560 boot loader
BOOTLDR: C3560 Boot Loader (C3560-HBOOT-M) Version 12.2(44)SE5, RELEASE SOFTWARE (fc1)

[Carlos Villagran]

Hi!

Please configure the command  "ip routing" in globlal configuration mode. After that I suggest you to check if the vlan interfaces are in up/up state with the "show ip int br" command. 

About the NAT question, you will have to create an ACL which will match the traffic you want to get nat'd. 

Please apply that ACL with the command  ip nat inside source list [ACL NAME] interface [THE INTERFACE OF YOUR ROUTER FACING YOUR ISP] 

Apply NAT in the interface facing your LAN  as INSIDE with the command  ip nat inside in the interface configuration mode.

Do the same with your interface facing your ISP/WAN with the command  ip nat out in the interface configuration mode.

Regards!

JC 

[No2984932]

hi,

thanks for replay.

I configured ip routing  and  interfaces vlan are up . Thats why I dont understand why the rating table is empty.

part of config.:
!
no aaa new-model
system mtu routing 1500
ip routing
!

SW3560#sh ip int brief
Interface              IP-Address      OK? Method Status                Protocol
Vlan1                  unassigned      YES NVRAM  administratively down down   
Vlan2                  172.16.2.1      YES NVRAM  up                    down   
Vlan3                  172.16.3.1        YES NVRAM  up                    down   
Vlan4                 172.16.4.1        YES NVRAM  up                    down   
Vlan5                unassigned      YES NVRAM  down                  down   
Vlan6                unassigned      YES NVRAM  down                  down   
FastEthernet0/1        unassigned      YES unset  down                  down   
FastEthernet0/2        unassigned      YES unset  down                  down 

[Jon Marshall · Accepted solution]

The interfaces are not up/up so they won't show in the IP routing table.

How have you connected everything up ?

Jon

[No2984932]

you're right.

I am not physically connected devices.I try with one port and its work, now routing table isn't emty.

thanks . I'm not thinking ...

[Carlos Villagran]

Hi,

Your interfaces are not in up/up state since no vlans are created in the vlan database of your switch.

Please configure vlan 1, vlan 2 vlan 3 and so on  in global configuration mode.

If the interfaces do not go up/up state please configure a port with its respective vlan in interface configuration mode with the  switchport access vlan 2 command. (change numer 2 with its respective vlan number).

Hope it helps, best regards!

JC