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VLAN Ethernet: When to use?

Hello
I support a ASG 425 that is currently configured with several VLANs on the lag0 interface.

I wonder if this is required...

1) There is a coreswitch that does the routing between this VLANs anyway (so ASG is not involved in any filtering between VLANs...I guess that would be a usecase for using VLAN-interfaces in the ASG?)

2) The core switch has a default route set to one of those IPs of the ASG

Wouldn't it be smarter / less cluttered to configure just one standard Ethernet Interface with that IP address and kick out all the other VLAN-Interfaces?

Best regards and sorry for the pretty basic question

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0 IngoPohlschneider over 11 years ago

Hello
yes that is correct.
The VLANs are used to break down broadcast traffic and via IP helpers to separate the network into subnets which are handled by different DHCP-subnets.

A few days ago I tried to do just what you suggested:
I deactivated all VLAN-interfaces where i thought there shouldn't be any dependencies. But the ASG wasn't reachable anymore from the LAN afterwards (not even on IPs where I didn't deactivate the interfaces)

Best regards
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0 IngoPohlschneider over 11 years ago

Hello
yes that is correct.
The VLANs are used to break down broadcast traffic and via IP helpers to separate the network into subnets which are handled by different DHCP-subnets.

A few days ago I tried to do just what you suggested:
I deactivated all VLAN-interfaces where i thought there shouldn't be any dependencies. But the ASG wasn't reachable anymore from the LAN afterwards (not even on IPs where I didn't deactivate the interfaces)

Best regards
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