Arp resolve in inter-vlan

[krish1986]

Hi all,

The scenario is, in an L3 switch the inter-vlan ip traffic should be passed. Suppose pc1 connected to port1 ipvlan subinterface (10.1.1.1/24, vlan id 10 configured). Pc2 is connected to port2 ipvlan sub interface(20.1.1.1/24, vlan 20). And some ports are free, which are part of a plane Ethernet interface(no vlan enabled). Suppose the Arp table in the L3 switch does not contain ip-mac mapping for pc2. And we want to send traffic from pc1 to pc2 also. How arp will be broadcasted?

Will the arp request will go to all ports of the switch or only vlan enabled ports?

Thank you

[Jon Marshall]

PC1 will arp for it's default gateway (10.1.1.1) and this will be a broadcast in vlan 10 so only ports in vlan 10 will see it. 

PC1 will then send a packet to the L3 interface for vlan 10 and then the switch will arp for PC2's mac address. 

This will again be a broadcast within vlan 20 so only ports in that vlan will see it. 

Jon

[paul driver]

Hello

Please have a look at this - Here