Dell PowerConnect 7024 User Manual - Page 845
What Are Tunnel Interfaces?, Why Are Routing Interfaces Needed?, tunnel endpoint
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What Are Tunnel Interfaces? Tunnels are a mechanism for transporting a packet across a network so that it can be evaluated at a remote location or tunnel endpoint. The tunnel, effectively, hides the packet from the network used to transport the packet to the endpoint. This allows for the transmission of packets that the transport network cannot process directly, such as in one of the following cases: • The packet protocol is not supported. • The packet is in an incompatible addressing space. • The packet is encrypted. PowerConnect 7000 Series switches support tunnels to encapsulate IPv6 traffic in IPv4 tunnels to provide functionality to facilitate the transition of IPv4 networks to IPv6 networks. The switch supports two types of tunnels: configured (6-in-4) and automatic (6-to-4). Configured tunnels have an explicit configured endpoint and are considered to be point-to-point interfaces. Automatic tunnels determine the endpoint of the tunnel from the destination address of packets routed into the tunnel. These tunnels correspond to Non-Broadcast Multi-Access (NBMA) interfaces. A configured tunnel interface has a single tunnel associated with it, while an automatic tunnel interface has an infinite number of tunnels (limited only by the address encoding scheme). Because tunnels are used as logical interfaces, you can define static routes that reference the tunnels. Additionally, dynamic routing can be configured to use the tunnels. Why Are Routing Interfaces Needed? The routing interfaces this chapter describes have very different applications and uses, as this section describes. If you use the switch as a layer 2 device that handles switching only, routing interface configuration is not required. When the switch is used as a layer 2 device, it typically connects to an external layer 3 device that handles the routing functions. VLAN Routing VLAN routing is required when the switch is used as a layer 3 device. VLAN routing must be configured to allow the switch to forward IP traffic between subnets and allow hosts in different networks to communicate. Configuring Routing Interfaces 845
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-
1,199
-
1,200
-
1,201
-
1,202
-
1,203
-
1,204
-
1,205
-
1,206
-
1,207
-
1,208
-
1,209
-
1,210
-
1,211
-
1,212
-
1,213
-
1,214
-
1,215
-
1,216
-
1,217
-
1,218
-
1,219
-
1,220
-
1,221
-
1,222
-
1,223
-
1,224
-
1,225
-
1,226
-
1,227
-
1,228
-
1,229
-
1,230
-
1,231
-
1,232
-
1,233
-
1,234