default gateway L2 switch

Hi,

Want to get my head around default gateway on L 2 switch.

ok 3 VLANs on L2 switch. vlan 2 vlan 3
vlan 4 is reachable through route

I have management on vlan 2 - I have an IP address 192.168.2.1 on vlan 2
I have an IP address on vlan 3 - 192.168.3.1 - I can ssh to manage switch on both of these IPs on vlan 2 and 3
vlan 4 is 192.168.4.0/24
my default gateway on the L2 switch is to my L3 switch  IP 192.168.3.3

I ssh to the L2 switch on vlan 2 192.168.2.1.   Can I then from this ssh session on the switch ping to VLAN 4
the default gateway L2 is not on VLAN 2 ?  Does it matter that I have come into the L2 switch by ssh  on vlan 2 - or do i need to ssh to VLAN 3 which has an IP on same subnet as the L2 gateway in order to ping another VLAN ??  - when I try to ping an IP on vlan 4   does it use the default gateway set on the L2 switch?

thanks
LVL 1
philb19Asked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Don JohnstonInstructorCommented:
I'm really having a difficult time following you...

If you have a true layer-2 switch, then you can only have one SVI (VLAN interface) up.  

So I don't understand how you have IP addresses on multiple VLANs.

And the default gateway has to be on the same network as the host.
0
philb19Author Commented:
Actually Ive just confused myself I think
correct me if wrong
The default gateway on a L2 switch is just for management traffic. And its just the gateway for that subnet only. ie gateway of the IP range that its on. So default gateway 192.168.2.254 on a L2 switch  is gateway for 192.168.2.0/24 "only" - otherwise its not used.

The gateway for VLAN 3 on 193.168.3.0/24 - would need to be on 192.168.3.0/24 and be a router interface.  When I ssh to Vlan3 and ping different subnet Id go via the gateway for this vlan. This question rose into my head as somehow we got couldn't reach a L2 switch management IP - and it was due to its default router not being on the management range IP subnet.

"If you have a true layer-2 switch, then you can only have one SVI (VLAN interface) up. " - here im not sure about. - We definitely have a L2 stack with multiple vlan interfaces on it. I can ssh to both of these interface IPs example vlan 3 192.168.3.1 and vlan 2 192.168.2.1 ?? - and im on the same switch
0
Neil RussellTechnical Development LeadCommented:
Save all the back and forth, would be easier if you just give make and model of switch.
0
Determine the Perfect Price for Your IT Services

Do you wonder if your IT business is truly profitable or if you should raise your prices? Learn how to calculate your overhead burden with our free interactive tool and use it to determine the right price for your IT services. Download your free eBook now!

philb19Author Commented:
Cisco 2960 sstack
0
Don JohnstonInstructorCommented:
The 2960 is not a true layer-2 switch. It can do basic layer-3 routing (but static routes, no routing protocols).  But layer-3 routing is disabled by default.

The default gateway on a L2 switch is just for management traffic.
Correct.
And its just the gateway for that subnet only. ie gateway of the IP range that its on.
No. Just for the management of the switch
The gateway for VLAN 3 on 193.168.3.0/24...
This where I get confused. If we're talking about layer-2 switches, the only gateway is the one for the management VLAN.
"If you have a true layer-2 switch, then you can only have one SVI (VLAN interface) up. " - here im not sure about. - We definitely have a L2 stack with multiple vlan interfaces on it. I can ssh to both of these interface IPs example vlan 3 192.168.3.1 and vlan 2 192.168.2.1 ?? - and im on the same switch
This could be the result of the 2960 not being a true layer-2 only switch.  It is possible (I've never tried to do this) that even with layer-3 routing disabled that you would be able to have multiple SVI's up at the same time. The switch would still not be able to route traffic between the different networks, but you could have multiple VLAN interfaces up.
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
philb19Author Commented:
sorry should have explained myself better

The gateway for VLAN 3 on 193.168.3.0/24...

the gateway for vlan 3 is via trunked uplink  to the L3 core- the gateway resides itself on the L3 router core.

thanks very much for detailed explanation - awesome help
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Switches / Hubs

From novice to tech pro — start learning today.