layer 3 switch?

Answered Question
Jun 2nd, 2008

if you have a 4507 with a standard image is it a layer 3 switch? and if not would it be worth it to upgrade to an enhanced image for a medium sized business - small webfarm/dmz - 40 very small remote site and under 400 users?

thanks Jerry

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Correct Answer by Jon Marshall about 8 years 6 months ago

Jerry

You would configure L3 inter-vlan routing as you would on any L3 switch ie.

1) Create your vlans at layer 2 eg.

4500(config)# vlan 10

4500(config-vlan)# name v10

etc for all vlans.

2) Create your L3 SVI's for your L2 vlans eg.

int vlan 10

ip address 192.168.5.1 255.255.255.0

int vlan 20

ip address 192.168.6.1 255.255.255.0

clients in vlan 10 would have their default-gateway set to 192.168.5.1 and clients in vlan 20 would have their default-gateway set to 192.168.6.1

3) Because these are directly connected interfaces on the 4500 then they will automatically be routed. I can't remember off the top of my head but if not then type in config mode

4500(config)# ip routing

4) Add a default-route on the 4500 pointing to the router

ip route 0.0.0.0 0.0.0.0

5) Add routes to the router for each vlan pointing back to the 4500.

Jon

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Jon Marshall Mon, 06/02/2008 - 09:53

Jerry

Which supervisor and which IOS version are you talking about. The basic L3 image for the 4500 does support IP routing but not EIGRP/OSPF/ISIS protocols. So you can do static routing/RIP.

Jon

jerry.mcrae Mon, 06/02/2008 - 10:00

we have a sup 5 two of them - IOS i cant remember but i know we didnt pay for the enhanced image. can you point me to a doc that will explain how i can configure this as layer 3 b/c our director wants routing on the switch rather than going to our router for switching.

thanks for the replys.

Correct Answer
Jon Marshall Mon, 06/02/2008 - 10:05

Jerry

You would configure L3 inter-vlan routing as you would on any L3 switch ie.

1) Create your vlans at layer 2 eg.

4500(config)# vlan 10

4500(config-vlan)# name v10

etc for all vlans.

2) Create your L3 SVI's for your L2 vlans eg.

int vlan 10

ip address 192.168.5.1 255.255.255.0

int vlan 20

ip address 192.168.6.1 255.255.255.0

clients in vlan 10 would have their default-gateway set to 192.168.5.1 and clients in vlan 20 would have their default-gateway set to 192.168.6.1

3) Because these are directly connected interfaces on the 4500 then they will automatically be routed. I can't remember off the top of my head but if not then type in config mode

4500(config)# ip routing

4) Add a default-route on the 4500 pointing to the router

ip route 0.0.0.0 0.0.0.0

5) Add routes to the router for each vlan pointing back to the 4500.

Jon

Pravin Phadte Mon, 06/02/2008 - 09:54

hi Jerry,

New image would be upgraded for reason of new technology, troubleshoting commands or if there is any bugs in the old ios which is hampering your network.

Since this is more about users and remote site i would suggest that unless the switch is takeing beeting with the cpu usage and degrading the quality of the network then you can think of upgrading the device or change the network design.

Ios will not make any diffrence for users and connectivity.

I would also suggest you to wait for more responces from experts.

Hope this helps.

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