Layer 2¶
MAC Layer¶
- Ethernet
Discovery¶
- Cisco Discovery Protocol
- Link Layer Discovery Protocol (LLDP)
Link Layer Control Protocol¶
- Bit Index Explicit Replication – Link Layer Multi-cast forwarding.
- Link Layer Control (LLC) - multiplex protocols over the MAC layer.
- Spatial Reuse Protocol (SRP)
- High-Level Data Link Control (HDLC)
- Logical link control (LLC)
- Link Agg Control Protocol (Active/Active, Active/Passive) – 18.04
Virtual Private Networks¶
- MPLS
- MPLS-o-Ethernet – Deep label stacks supported
- Virtual Private LAN Service (VPLS)
- VLAN
- Q-in-Q
- Tag-rewrite (VTR) - push/pop/Translate (1:1,1:2, 2:1,2:2)
- Ethernet flow point Filtering
- Layer 2 Cross Connect
Bridging¶
- Bridge Domains
- MAC Learning (50k addresses)
- Split-horizon group support
- Flooding
ARP¶
- Proxy
- Termination
- Bidirectional Forwarding Detection
Integrated Routing and Bridging (IRB)¶
- Flexibility to both route and switch between groups of ports.
- Bridged Virtual Interface (BVI) Support, allows traffic switched traffic to be routed.