Recently I've been involved in a proyect that requires the usage of VRF and MP-BGP.
Here's my doubt:
SWITCH_A has two VRF (Red and Blue), those VRFs have assigned the VLANS 100 and 200 respectively
VLAN 100 subnet is 192.168.100.0/24, VLAN 200 subnet is 192.168.200.0/24
Via MP-BGP VRF Red learns VRF Blue locally attached subnets (and viceversa)
They learn other VRF subnets but I don't need we should consider that now for this question
So VRF Red has two routes:
192.168.100.0/24 (locally connected)
192.168.200.0/24 (also locally connected but via VRF Blue)
VRF Blue has also the same two routers but 192.168.200.0/24 is local and 192.168.100.0/24 is also local but via VRF Red
Each VRF has its own ARP table, or so it seems by the fact that I have to query the ARP table specifying the VRF
So here's my question, does this mean, that the switch will use 2x the memory resources for the ARP table? in short, by doing this, each ARP entry will require 2 memory "slots"? say 192.168.100.100, this IP is on VLAN 100 on VRF Red, ok there's an ARP entry there for it. But it's also an ARP entry on VRF Blue, If my hypothetical switch has only 10 memory slots for ARP entries, by doing this I've consumed already 2 (remaining 8, so in "reality" I could only have 5 ARP records).
Is this the case? or the switches only store a reference to the ARP table of the other VRF to save memory?
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