Cisco 7609 User Manual

14-2
Cisco 7600 Series Router Cisco IOS Software Configuration Guide—12.1E
78-14064-04
Chapter 14 Configuring IEEE 802.1Q Tunneling and Layer 2 Protocol Tunneling
Understanding How 802.1Q Tunneling Works
Figure 14-1 IEEE 802.1Q Tunnel Ports in a Service-Provider Network
Figure 14-2 Untagged, 802.1Q-Tagged, and Double-Tagged Ethernet Frames
Customer A
VLANs 1 to 100
Customer B
VLANs 1 to 200
Customer B
VLANs 1 to 200
Customer A
VLANs 1 to 100
Tunnel port
VLAN 40
Tunnel port
VLAN 30
Trunk
ports
Trunk
ports
Tunnel port
VLAN 30
Tunnel port
VLAN 40
Service
provider
74016
Trunk
Asymmetric link
Tunnel port
VLAN 30
802.1
custo
Original Ethernet frame
Destination
address
Length/
EtherType
Frame Check
Sequence
Source
address
SADA Len/Etype Data FCS
SADA Len/Etype DataEtype Tag FCS
SADA Len/Etype DataEtype Tag Etype Tag

Cisco 7609 Specifications

General

Brand	Cisco
Model	7609
Category	Network Router
Language	English