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Chapter 27 Layer 2 Protocol Tunneling

GS2200-8/24 User’s Guide

220

To emulate a point-to-point topology between two customer switches at different sites, such as A

and B, you can enable protocol tunneling on edge switches 1 and 2 for PAgP (Port Aggregation

Protocol), LACP or UDLD (UniDirectional Link Detection).

Figure 140 L2PT Network Example

27.1.2.1 Layer 2 Protocol Tunneling Mode

Each port can have two layer 2 protocol tunneling modes, Access and Tunnel.

•The Access port is an ingress port on the service provider's edge device (1 or 2 in Figure 140 on

page 220) and connected to a customer switch (A or B). Incoming layer 2 protocol packets

received on an access port are encapsulated and forwarded to the tunnel ports.

•The Tunnel port is an egress port at the edge of the service provider's network and connected to

another service provider’s switch. Incoming encapsulated layer 2 protocol packets received on a

tunnel port are decapsulated and sent to an access port.

Service Provider's

Network

STP