Chapter 29 Layer 2 Protocol Tunneling
ES3500 Series User’s Guide
243
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 138 L2PT Network Example
29.1.1 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 138 on
page 243) 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.
1
2
A
B
Service Provider's
Network
C
D
STP
STP
STP
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