two questions of routing VLAN fast

Let's say that I have spend a routing 4 L3 VLAN

VLAN 1 192.168.10.0/24, virtual interface of the switch is 192.168.10.254 inside this vlan
VLAN 2 is 192.168.20.0/24, the virtual interface of the switch is 192.168.20.254 inside this vlan
VLAN 3 is 192.168.30.0/24, the virtual interface of the switch is 192.168.30.254 inside this vlan
VLAN 4 192.168.40.0/24, virtual interface of the switch is 192.168.40.254 inside this vlan

There is that a single router out of this switch at the net, and lets say that it is in VLAN 1 and its address is 192.168.10.1

first question - inside the L3 switch I need to add a default route 0.0.0.0 0.0.0.0 192.168.10.1

to ensure that all traffic not matching only a 192.168.x.x address not know where to go to the net, correct?

Second - when this router, is there a difference if I use the following static route:

192.168.20.0 255.255.255.0 192.168.10.254

Instead of

192.168.20.0 255.255.255.0 192.168.20.254

?

Whatever happens, the package comes to switch L3, but in one case, what happened to it through the interface VLAN 1 VLAN and in the other case, he gets there through the interface VLAN VLAN for which traffic is intended anyway. is what im trying to figure out, this will make a difference at all? especially with regard to broadcast packets?

If it makes no difference, then it is safe to say that the following static route would be optimal?

192.168.0.0 255.255.0.0 192.168.10.254

Re "of all". Fix. The L3 switch will route traffic based on its routing table. By default, he knows all IP subnets, it is directly connected to, i.e. all subnets VLAN. If you must add a route by default manually or not depends on the exact implementation. It would be nice if the L3 switch will use the no default for routing gateway that you use for the switch IP parameters itself (if there is an option in the web interface to set a default gateway). If you cannot define a default gateway on the L3 switch, you might have to manually add a static route. The easiest way would be to check the current routing table and see if there is a default or not gateway.

Re "then." A router can only transfer the packets to the next hop router. The next hop router must be connected to this router. The route "192.168.20.0 255.255.255.0 192.168.10.254" is correct for a router with IP address 192.168.10.1 and 255.255.255.0 as 192.168.10.254 subnet mask is connected to the router. "192.168.20.0 255.255.255.0 192.168.20.254" is not correct. The router cannot learn the path to a subnet specific 192.168.20.0/255.255.255.0 using a gateway on that subnet. It is not correct to use this kind of a route and do not use it even if it might work even (because the router is a simple query ARP to find the MAC address of the 192.168.20.254 and your L3 switch will respond to the ARP request, even if it's on the internet of 192.168.10.254). At the same time that another router between 10 and 20 subnets it would work no more...

Re your conclusion: I recommend to keep four static routes to subnets existing on the L3 switch instead of put in a single subnet more great which includes a lot of addresses that are not connected here. Technically, this works if you only use working IP addresses. But you will see some loops if you send something to 192.168.55.50 or similar. The gateway router it will send to the L3 switch that will return to the catwalk. They should understand it's a loop, but still, I would not recommend this type of installation... Add routes for each of the L3 switch subnet...

Tags: Linksys Switches

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