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Webcast-Catalyst9k
New Member

L3 routing

Hi,

What is the best way of configuration of port between a L3 switch and a router, if the switch is doing the inter-VLAN routing.

3 REPLIES
Hall of Fame Super Blue

Re: L3 routing

I would use a P2P link between the switch and router ie.

switch

int fa0/1

no switchport

ip address 192.168.5.1 255.255.255.252

router

int fa0/1

ip address 192.168.5.2 255.255.255.252

then either use static routing or run a routing protocol between the L3 switch and the router.

Jon

Re: L3 routing

Hi,

I agree with Jon if I have a layer 3 switch.

I would use a layer 3 connectivity between the switch and the router.

-> Sushil

Super Bronze

Re: L3 routing

"Best" is, it depends. Normally, most would do as Jon suggests. However, if the L3 switch is the access layer, you might also trunk all its VLANs to the router, effectively placing two routers on the user VLANs. The L3 switch should continue to be the default gateway.

Doing this flattens the routed topology, and negates the advantage of running a routing protocol on the L3 switch or reduces the number of static routes.

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