Cisco SG 300-10 (SRW2008-K9-NA) 10-Port Gigabit Managed Switch


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Cisco Layer 3 switching

Cisco Layer 3 switching Plugtogether.com Computer Renew, Networking, Advanced security technologies.


How to use a layer 3 switch and a firewall?

May 20, 2006 by Mansour | Posted in Computer Networking

I have a layer 3 Cisco switch. I've made 10 VLANs with contrasting IP address range and I want each VLAN users to be controlled by a firewall when they want to communicate with users in other VLANs. But my Cisco switch layer 3 module fully routes all packets to their destinations because it recognizes them all as connected subnets.
How can I prevent this? I want all packets have to go to firewall and then firewall decides if pack is permitted or denied accessing other VLAN.

If they are all in the same switch, this is around impossible unless it's a Catalyst 6500 with a firewall blade. But I'm betting you're dealing with a 3750 or something like.

You might be able to assign a next hop using policy based routing, but I've never tried this. Not sure if it would line or not. But that's the only way I can think of to get them through an external firewall.

You could set up access lists and apply them to the individual VLAN interfaces on the switch. It isn't stateful, but it might get you where you deprivation to go.

cliffinutah | May 21, 2006

If they are all in the same switch, this is identically impossible unless it's a Catalyst 6500 with a firewall blade. But I'm betting you're dealing with a 3750 or something almost identical.

You might be able to assign a next hop using policy based routing, but I've never tried this. Not sure if it would employment or not. But that's the only way I can think of to get them through an external firewall.

You could set up access lists and apply them to the individual VLAN interfaces on the switch. It isn't stateful, but it might get you where you insufficiency to go.
cliffinutah | May 21, 2006

What is the main difference between a Layer 3 switch and a router?

Sep 25, 2008 by Stoic Mushroom | Posted in Computer Networking

I surmise it's that a Layer 3 switch is geared toward fast data handling, while a router is all about accurate data delivery.

Is this right?

Do you require a router if you are using a Layer 3 switch?

Dec 03, 2007 by Arthur R | Posted in Computer Networking

If a layer 3 switch is a union of a router and a switch do you still require a router to connect to the internet/

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Layer 3 Switch - News


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