1、Implementing Inter-VLAN Routing,Describing Routing Between VLANs,Inter-VLAN Routing with External Router,Single trunk link carries traffic for multiple VLANs to and from router.,Inter-VLAN Routing External Router Configuration Commands,Configure on subinterface encapsulation dot1Q (or isl) 10 ip add
2、ress 10.10.1.1 255.255.255.0 Verify show vlan 10 show ip route,Inter-VLAN Routing on External Router: 802.1Q Trunk Link,Inter-VLAN Routing on External Router: ISL Trunk Link,Verifying Inter-VLAN Routing,The ping command tests connectivity to remote hosts.,Verifying the Inter-VLAN Routing Configurati
3、on,Router#show ip interface brief,Displays the current IP configuration per VLAN,Router#show ip route,Displays IP route table information,Router#show vlan,Displays IP address on interfaces and current state of interface,Explaining Multilayer Switching,Layer 2 Switch Forwarding Process,Logical Packet
4、 Flow for a Multilayer Switch,Rewritten IP Unicast Packet,IP Unicast Frame and Packet Rewrite,Incoming IP Unicast Packet,Content Addressable Memory Table,Requires an exact match on all bits Matching is a binary operation: 0 or 1 Provides very high-speed lookupsKey=MAC; VLAD ID,Ternary Content Addres
5、sable Memory Table,Matches only significant values Matches based on three values: 0, 1, or X (either) Masks used to wildcard some content fields,Summary,A router on a stick can be used to route between VLANs using either ISL or 802.1Q as the trunking protocol. A router on a stick requires subinterfaces, one for each VLAN. Verify inter-VLAN routing by generating IP packets between two subnets. Multilayer switches can forward traffic at both Layer 2 and Layer 3. Multilayer switches rewrite the Layer 2 and Layer 3 header using tables held in hardware.,
