03-12-2016 06:23 AM - edited 03-08-2019 04:56 AM
Im asking for the behavior of a layer 3 switch when receiving a packet with A destination ip address that have a resolution in the arp-cache but no entry is found for the mac-add in the cam-table
same question if there is an entry in the cam-table.and no entry in the arp-cache.
03-12-2016 07:04 AM
Hi,
Did not get the exact situation you are talking about, however if no arp, it will send an ARP request if needed.(remember if it is within the same vlan (L2), to forward the packet the switch does not need to have an ARP entry, all it needs a mac address.)
Again if no mac , it will flood it, it is called unicast flooding.
Hope this helps
Madhu
03-12-2016 07:11 AM
im talking about the situation where a layer 3 switch has an arp entry for a given ip address.
exemple : IP-@-1===> MAC-@-1, but when it comes to the Cam-table there is no entry for the MAC-@-1
03-12-2016 12:53 PM
The CAM table will only be populated if the MAC-@-1 is in a port on this switch or one of the same VLAN. If it is inbound from another VLAN on another switch, then there is no CAM entry for the device as it isn't present on the switch.
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide