ZyXEL Communications VES1724-56 - Layer 2 Protocol Tunneling Mode

Chapter 30 Layer 2 Protocol Tunneling
VES1724-56 User’s Guide
283
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 174 L2PT Network Example
30.1.1 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 174 on
page 283) 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