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New Member

4006 EngineIII VLAN question

Hi,

I need start with a VLAN/Layer3 implementation in a quite big site currently completely flat. (only layer2 switch in place)

In order to reduce and segment the impact for this upgrade it's possible using a Cat4006 with EngineIII to start with a 5 IP-subnet in the same Vlan.

In this way the local routing will work fine between the local 5 subnet? The only bad is that I loose the benefit of the VLAN isolation or there is other problem.Then step by step we will procede creating the other 4 VLAN and moving on it the own subnet.

Thanks for the answer

6 REPLIES
Cisco Employee

Re: 4006 EngineIII VLAN question

Yes, you could do this just fine. Configure multiple "ip address xyz secondary" commands under the single vlan interface.

New Member

Re: 4006 EngineIII VLAN question

you need to configure "'no ip redirects' to make this switching done in hardware if you configure secondary addresses on cat4k sup3. You would not get good performance with software switching

New Member

Re: 4006 EngineIII VLAN question

Hi,

what about the "ip route-cache same-interface" command?

Is it possible to use it on the Cat4k Switching engine III?

Where I can find some configuration example for this new module?

thanks a lot,

Leonardo

Cisco Employee

Re: 4006 EngineIII VLAN question

The Cat4k SupIII switches packets in hardware and ip route-cache same-interface will not have any effect on packet flow.

New Member

Re: 4006 EngineIII VLAN question

i had to migrate a flat network where the routing was done by a linux server have 3 nics when i implemented vlans i had to use proxy arp as linux couldnt be removed from the network as the users logged into the linux server to use the network i m not doing any routing i just have a default gatewar for the linux server u could try the same use proxy arp

Cisco Employee

Re: 4006 EngineIII VLAN question

Yes, this configuration is possible. You are correct that you loose VLAN isolation and create a single broadcast domain.

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