[j-nsp] Juniper EX4550: 32k MAC Addresses but only 8k ARP Entries? What does that mean?

[Adam Vitkovsky]

> v
> Sent: Thursday, September 08, 2016 3:59 PM
> My Thoughts:
> I guess "ARP Entries" is the number of MAC-to-IP mappings, which is relevant
> for using the Layer 3 capabilites of the switch.
> And "MAC Addresses" is the number of MAC-to-Port mappings. So if i build a
> network with multiple switches connected one after another, I will only be
> able to build a network with up to 32k hosts. Is that correct?
>
You nailed it,
on that last sentence - to avoid this "weakest link in the chain" limit, that's where conversation-based MAC learning using FabricPath or learning MAC addresses via control plane like in EVPN or VXLAN with EVPN CP or ESADI in TRILL comes handy (cause in reality there's never a need for all SWs to learn all MAC addresses).



adam









        Adam Vitkovsky
        IP Engineer

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