BGP Border Gateway Protocol

• Used by ISPs to determine best path between Service Providers
• Does not count individual routers as Hops, but basically counts an SP as a Hop
• Requires a trust between SPs to share BGP information and each SP is responsible for filtering undesirable information they might receive

Channel Protocols

Used to group connections together for increased speed and redundancy. (If one connection breaks, the other takes over, but speed is reduced).  When enabled, both ports work as a single interface.

• LAPC (Industry Standard)
• PAgP (Cisco Proprietary) Port Aggregation Protocol

Discovery Protocols

Protocols used by network devices for advertising their identity, capabilities, and neighbors in a LAN

Vendor Neutral

• LLDP – Link Layer Discovery Protocol

Proprietary

• CDP – Cisco Discovery Protocol
• FDP – Foundry Discovery Protocol (Foundry networks, now Brocade)
• LLTD – Link Layer Topology Discovery (Microsoft)
• NDP – Nortel Discovery Protocol

Fabric

• Use BGP for routing?

LAG

LDP Label Distributed Path

• One of the protocols used with MPLS to determine best initial path

LLDP Link Layer Discovery Protocol

• Vendor Neutral link layer discovery protocol used by networking devices for advertising their identity, capabilities, and neighbors in a LAN

MCT – Multi Chassis Trunking

• Allows port channels across a switch pair

MPLS Multi-Protocol Label Switching

• Used within a Service Provider to quickly route packets
• Attaches a Label between L2 and L3 at ingress and removed on egress
• Does not care what the underlying protocol is.
  • Attaches a tag at the L2 header for quick read, decision making
• Enables High performance traffic forwarding
• Uses LDP or RSVP to determine initial best route