Routing between two layer 3 switches

[danielashleysmith]

Hi,

I've got two layer 3 switches, each of which have their own set of vlans and hosts, the network ip range however is totally different on both switches. I've created a trunk and etherchannel between the two switches, and can communicate across both switches, provided the hosts are on the same vlan. I cannot however get hosts on a different vlan to talk to the gateway or hosts on the other L3 switch.

What I'm trying to achieve is host A:

IP address 10.155.12.34 on switch A 
vlan 12
Default gateway 10.155.12.1 

communicate with host B:

IP address 172.14.102.45 on switch B
vlan 102 
Default gateway 172.14.102.45

If I put host A on vlan 102 and change its IP address to the same subnet as hosts on switch B, I can ping across without any issues.

I've tried creating some static routes but they didn't work, for example:

ip route 10.155.12.0 255.255.255.0 172.14.102.1 - didn't work

If anybody can share some advice with this issue I'd highly appreciate it.

Thanks

[cesarfer]

Hello Daniela,

Can you please clarify if these switches are the Default Gateway for VLAN 12 and VLAN 102 respectively?. If they are not then, who is the default gateway and where is connected? Is it a router directly connected to the switches?

Can you please share the following outputs from both switches:

* Show ip interface brief | exc una

* Show ip route

* Show run interface vlan 12

* Show run int vlan 102

* Show interface trunk

What's the interface that connects both switches?

Thanks,

Cesar Fernandez J

CCNP R&S 

[Bernhard Mayer]

Hi,

Who is 172.14.102.1?

Config example:

client 1--vlan 3--> switch1 --transfernetwork/vlan 4--> switch 2 -- vlan 5 --> client 2

Client 1:
IP:           192.168.0.1
Subnet:   255.255.255.0
GW:        192.168.0.254 (vlan 3 interface on switch 1)

Switch1:
vlan 3
name client vlan 3
exit
interface x/x/x
switchport access vlan 3
exit
interface vlan 3
ip address 192.168.0.254 255.255.255.0
no shut
exit
vlan 4
name transfer vlan
exit
interface x/x/x
switchport mode access or switchport mode trunk
switchport access vlan 4 or switchport trunk allowed vlan 4
exit
interface vlan 4
ip address 192.168.1.254 255.255.255.0
no shut
exit
ip route 0.0.0.0 0.0.0.0 192.168.1.1

Switch 2:

vlan 5
name client vlan 5
exit
interface x/x/x
switchport access vlan 5
exit
interface vlan 5
ip address 192.168.2.254 255.255.255.0
no shut
exit
vlan 4
name transfer vlan
exit
interface x/x/x
switchport mode access or switchport mode trunk
switchport access vlan 4 or switchport trunk allowed vlan 4
exit
interface vlan 4
ip address 192.168.1.1 255.255.255.0
no shut
exit
ip route 0.0.0.0 0.0.0.0 192.168.1.254

Client 2

IP:           192.168.2.1
Subnet:   255.255.255.0
GW:        192.168.2.254 (vlan 3 interface on switch 1)

Regards,

Bernhard