.. _l3:

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Layer 3
=======

This section identifies the features associated with Layer 3:

IP Layer
--------
* ICMP
* IPv4
* IPv6
* IPSEC
* Link Local Addressing

MultiCast
---------
* Multicast FiB
* IGMP

Virtual Routing and forwarding (VRF)
------------------------------------
* VRF scaling, thousands of tables. 
* Controlled cross-VRF lookups

Multi-path
----------
* Equal Cost Multi Path (ECMP)
* Unequal Cost Multi Path (UCMP)

IPv4
----
* ARP
* ARP Proxy
* ARP Snooping

IPv6
----
* Neighbour discovery (ND)
* ND Proxy
* Router Advertisement
* Segment Routing
* Distributed Virtual Routing Resolution

Forwarding Information Base (FIB)
---------------------------------

* Hierarchical FIB
* Memory efficient
* Multi-million entry scalable
* Lockless/concurrent updates
* Recursive lookups
* Next hop failure detection
* Shared FIB adjacencies
* Multicast support
* MPLS support