ATL Telecom R1-SW Ethernet Switch - Manual (Page 132)

R1-SW24L2B User’s Manual
7-8
802.1Q Tunneling Feature Configuration
The 802.1Q tunneling feature supports secure virtual private networks (VPNs). 802.1Q
tunneling enables service providers to segregate traffic from different customers in the service
provider infrastructure while significantly reducing the number of VLANs required to support
the VPNs. 802.1Q tunneling allows multiple customer VLANs to be carried by a single VLAN
on the Corecess R1-SW24L2B without losing their unique VLAN IDs.
When you configure 802.1Q tunneling on the Corecess R1-SW24L2B, traffic to be tunneled
comes into the Corecess R1-SW24L2B from an 802.1Q trunk port on a neighboring device and
enters the Corecess R1-SW24L2B through a port configured to support 802.1Q tunneling (a
tunnel port). When the tunnel port receives traffic from an 802.1Q trunk port, it does not strip
the 802.1Q tags from the frame header; instead, the tunnel port leaves the 802.1Q tags intact and
puts all the received 802.1Q traffic into the VLAN assigned to the tunnel port. The VLAN
assigned to the tunnel port carries the tunneled customer traffic to the other neighboring
devices participating in the tunnel port VLAN. When the tunneled traffic is received by an
802.1Q trunk port on a neighboring device, the 802.1Q tag is stripped and the traffic is removed
from the tunnel.
The following table shows how to configure trunk port on the Corecess R1-SW24L2B:
Table 7-6 Configuring trunk port
Commands Task
configure terminal
1. Enter Global configuration mode.
dot1q port <port-type>
<slot>/<port> tag
<tag-id> [<tag-id>]
2. Set the specified port to a trunk port.
y <port-type>: The port type (
fastethernet
,
gigabitethernet
)
y <slot>: The slot number of the port (1 ~ 3)
y <port>: The port number of the port (1 ~ 24)
y <tag-id>: The tag id to be tunneled by a trunk port (VLAN ID)
end
3. Return to the Privileged mode.
show dot1q port
4. Verify the 802.1Q trunk port configuration.