Routing between VLANs using a Layer 3 Switch

Routing between VLANs using a Layer 3 Switch
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Routing between VLANs using a Layer 3 Switch support 03-24-2005
Posted by on March 24, 2005, 8:39 am
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I am trying to figure out how to get an echo response when I ping a
device on a different VLAN.

Just to test things and get them to work, currently, I have two Dell
Powerconnect 6024 switches on my desk. I will call them S1 and S2. S1
is connected to our internal LAN. S2 is connected to S1 via a trunk
port on each switch and nothing else. I have some ports set up to be
on VLAN 10 and some to be on VLAN 20. I have IP Addresses assigned to
both VLANs on each switch as follows:

S1:
VLAN 10, 192.168.0.40
VLAN 20, 192.168.1.1

S2:
VLAN 10, 192.168.0.32
VLAN 20, 192.168.1.2

On S1, Port 24 is set up as a Trunk port with VLAN 10 & 20 both added
to it. It is connected by a cable to Port 1 on S2, also configured as
a trunk port with both VLAN 10 & VLAN 20 added to it.

Initially, I was trying to set up static routes using an white paper on
Dell's web site,
http://www.dell.com/downloads/­global/products/pwcnt/en/app_n­ote_38.pdf.


However, I received a reply from a Dell tech/engineer indicating that
this paper is misleading and that the Layer 3 switch (Powerconnect
6024) would automatically route between directly connected networks.

I am trying to test this by simply pinging the ip addresses of VLAN 20
from a computer connected to a port that is on VLAN 10. All I can get
is "Request timed out".

For example, my computer is connected to port 15 on S1 & has the IP
address, 192.168.0.103. I can ping 192.168.0.40, the IP address of
VLAN 10 on S1 with replies and I can ping 192.168.0.32, the IP address
of VLAN 10 on S2 and get replies. I cannot, however, get replies when
I ping 192.168.1.1 or 192.168.1.2, which is VLAN 20 on S1 & S2,
respectively.

If anyone is familar with configuring VLANs using Layer 3 & Layer 2
switches, please help.


Thanks,


Mike



Posted by T. Sean Weintz on March 24, 2005, 1:37 pm
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support@eriworld.com wrote:
> I am trying to figure out how to get an echo response when I ping a
> device on a different VLAN.
>
> Just to test things and get them to work, currently, I have two Dell
> Powerconnect 6024 switches on my desk. I will call them S1 and S2. S1
> is connected to our internal LAN. S2 is connected to S1 via a trunk
> port on each switch and nothing else. I have some ports set up to be
> on VLAN 10 and some to be on VLAN 20. I have IP Addresses assigned to
> both VLANs on each switch as follows:
>
> S1:
> VLAN 10, 192.168.0.40
> VLAN 20, 192.168.1.1
>
> S2:
> VLAN 10, 192.168.0.32
> VLAN 20, 192.168.1.2
>
> On S1, Port 24 is set up as a Trunk port with VLAN 10 & 20 both added
> to it. It is connected by a cable to Port 1 on S2, also configured as
> a trunk port with both VLAN 10 & VLAN 20 added to it.
>
> Initially, I was trying to set up static routes using an white paper on
> Dell's web site,
> http://www.dell.com/downloads/­global/products/pwcnt/en/app_n­ote_38.pdf.
>
>
> However, I received a reply from a Dell tech/engineer indicating that
> this paper is misleading and that the Layer 3 switch (Powerconnect
> 6024) would automatically route between directly connected networks.
>
> I am trying to test this by simply pinging the ip addresses of VLAN 20
> from a computer connected to a port that is on VLAN 10. All I can get
> is "Request timed out".
>
> For example, my computer is connected to port 15 on S1 & has the IP
> address, 192.168.0.103. I can ping 192.168.0.40, the IP address of
> VLAN 10 on S1 with replies and I can ping 192.168.0.32, the IP address
> of VLAN 10 on S2 and get replies. I cannot, however, get replies when
> I ping 192.168.1.1 or 192.168.1.2, which is VLAN 20 on S1 & S2,
> respectively.
>
> If anyone is familar with configuring VLANs using Layer 3 & Layer 2
> switches, please help.
>
>
> Thanks,
>
>
> Mike
>

Are your trunks tagged?


Posted by anoop on March 24, 2005, 2:43 pm
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support@eriworld.com wrote:
> I am trying to figure out how to get an echo response when I ping a
> device on a different VLAN.
>
> Just to test things and get them to work, currently, I have two Dell
> Powerconnect 6024 switches on my desk. I will call them S1 and S2.
S1
> is connected to our internal LAN. S2 is connected to S1 via a trunk
> port on each switch and nothing else. I have some ports set up to be
> on VLAN 10 and some to be on VLAN 20. I have IP Addresses assigned
to
> both VLANs on each switch as follows:
>
> S1:
> VLAN 10, 192.168.0.40
> VLAN 20, 192.168.1.1
>
> S2:
> VLAN 10, 192.168.0.32
> VLAN 20, 192.168.1.2

What subnet masks are you using?

> However, I received a reply from a Dell tech/engineer indicating that
> this paper is misleading and that the Layer 3 switch (Powerconnect
> 6024) would automatically route between directly connected networks.

You would typically need to enable IP forwarding on the switch.
See if they have a command such as "ip routing".

Anoop



Posted by eriworld on March 25, 2005, 12:37 pm
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The subnet mask in all cases is 255.255.255.0.

VLANs are on the following Networks on both switches.

VLAN 10: 192.168.0.0 /24
VLAN 20: 192.168.1.0 /24

Below is more detailed information about my configuration.

********Configuration of S1*********

Using Telnet to connect to S1, the following shows that Port g24 is in
Trunk mode and has VLAN 10 & 20 added to it.

console# show interface switchport ethernet g24
Port : g24
Port Mode: Trunk
Gvrp Status: disabled
Ingress Filtering: true
Acceptable Frame Type: admitAll
Ingress UnTagged VLAN ( NATIVE ): 1
Port is member in:

Vlan Name Egress rule Port Membership Type
---- -------------------------------- ----------- --------------------
1 1 Untagged System
10 10 Tagged Static
20 20 Tagged Static

The following shows that 192.169.0.40 is binded to VLAN 10 and
192.168.1.1 is binded to VLAN 20 on S1.

console# show ip interface vlan 10
Proxy ARP is disabled

IP Address Type Directed
Broadcast
----------------------- --------- -----------
192.168.0.40/24 static disable

console# show ip interface vlan 20
Proxy ARP is disabled

IP Address Type Directed
Broadcast
----------------------- --------- -----------
192.168.1.1/24 static disable

The following shows that 192.168.0.0/24 & 192.168.1.0/24 are directly
connected subnets on S1.

console# show ip route
Maximum Parallel Paths: 4 (4 after reset)
Codes: C - connected, S - static, R - RIP, O - OSPF, E - OSPF external
C 192.168.0.0/24 is directly connected
vlan 10
C 192.168.1.0/24 is directly connected
vlan 20
C 192.168.10.0/24 is directly connected
vlan 1

The following shows that Port g15, to which my workstation is
connected, is a member of VLAN 10.

console# show interface switchport ethernet g15
Port : g15
Port Mode: Access
Gvrp Status: disabled
Ingress Filtering: true
Acceptable Frame Type: admitAll
Ingress UnTagged VLAN ( NATIVE ): 10
Port is member in:

Vlan Name Egress rule Port Membership Type
---- -------------------------------- ----------- --------------------
10 10 Untagged Static


********Configuration of S2*********

Using HyperTerminal on a Serial cable connection between my worstation
and S2, the following shows that Port g1 is in Trunk mode and has VLAN
10 & 20 added to it.

console# show interface switchport ethernet g1
Vlan Name
Ingress UnTagged VLAN ( NATIVE ): 1
Port is member in:

Vlan Name Egress rule Port Membership Type
---- -------------------------------- ----------- --------------------
1 1 Untagged System
10 10 Tagged Static
20 20 Tagged Static

The following shows that 192.169.0.32 is binded to VLAN 10 and
192.168.1.2 is binded to VLAN 20 on S2.

console# show ip interface vlan 10
Proxy ARP is disabled

IP Address Type Directed
Broadcast
----------------------- --------- -----------
192.168.0.32/24 static disable

console# show ip interface vlan 20
Proxy ARP is disabled

IP Address Type Directed
Broadcast
----------------------- --------- -----------
192.168.1.2/24 static disable

The following shows that 192.168.0.0/24 & 192.168.1.0/24 are directly
connected subnets on S2.

console# show ip route
Maximum Parallel Paths: 4 (4 after reset)
Codes: C - connected, S - static, R - RIP, O - OSPF, E - OSPF external
C 192.168.0.0/24 is directly connected
vlan 10
C 192.168.1.0/24 is directly connected
vlan 20
C 192.168.11.0/24 is directly connected
vlan 1

********End of Configuration Information*********



Posted by eriworld on March 25, 2005, 12:39 pm
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Correction to last message:

In my last message, I wrote,

"...on S1, VLAN 10 is 192.168.040 & on VLAN 20, it is 192.168.0.32.
VLAN 20, on S1, is 192.168.1.1 & on S2 it is 192.168.1.2."

This should read as follows,

"...on S1, VLAN 10 is 192.168.040 & on S2, it is 192.168.0.32. VLAN
20, on S1, is 192.168.1.1 & on S2 it is 192.168.1.2."



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