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Forum Discussion
VLAN Routing for Newbies
Howdy All, I've recently decided to install a GS752 switch in our offices to segregate traffic to help with security. I've run into a problem that I'm hoping someone can help me with (to keep th...
Configuring IPv4 shortcut routing isn't more than enabling IPv4 routing in that switch class.
These switches with IPv4 routing enabled use a technique often referred to as "cut-through switching" or "hardware-based forwarding" to speed up IPv4 routing, which acts as a "shortcut" compared to traditional, software-based routing. This process is more accurately called multilayer switching or IP switching.
The need to define a Switched Virtual Interfaces (SVIs) for each of the VLANs and IP subnets attached that need to communicate, acting as their default gateways depends on the exact switch model and the effectively supported higher level routing protocols (like OSPF or RIP) or static routes to advertise reachability to other Layer 3 devices.
To my knowledge, these SVI config is mainly required on the Netgear Managed Switches, but often not on the Netgear Smart Managed Switches like the subject GS752 (unspecified model - and version, there exist about 15 or 20 different models) in absence of the support for other higher level routing protocols or subnet local SNMP for example.
Said that, systems on these IPv4 subnets will never "see" a dedicated default gateway like where SVIs are configured. This makes things very confusing for the devices on the subnet different from the management subnet - you can't quickly ping or thest the default gateway.
StephenB the router LAN IP does not need to be "reachable" in the VLAN 10 for shortcut routing, the switch does the routing over the switch management VLAN as configured. This is the only requirement.
the router LAN IP does not need to be "reachable" in the VLAN 10 for shortcut routing, the switch does the routing over the switch management VLAN as configured.
Thx for the explanation of IP switching. My own GS728TPv2 has a routing mode, but it is not enabled (my vlans are connected to different routers). So not something I have explored.
FWIW, I am thinking that getting more information on the firewall and how the switch connections to it are set up would be useful.
If it has enough LAN ports, then setting up one on VLAN10 should give him internet connectivity. If not, he should be able to put the fireware switch connection on all the VLANs (leaving tagging on for that port). Also I am thinking that there is likely a relay service there that might eliminate the need to set up the relay in the switch.
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