Specifications

Configuring Routing Between VLANs
How to Configure Routing Between VLANS
27
Figure 80 Cisco 7500 Distributed Architecture
This distributed architecture allows incremental capacity increases by installation of additional VIP
cards. Using VIP cards for switching the majority of IP VLAN traffic in multiprotocol environments
substantially increases routing performance for the other protocols because the RSP offloads IP and can
then be dedicated to switching the non-IP protocols.
VIP distributed switching offloads switching of ISL VLAN IP traffic to the VIP card, removing
involvement from the main CPU. Offloading ISL traffic to the VIP card substantially improves
networking performance. Because you can install multiple VIP cards in a router, VLAN routing capacity
is increased linearly according to the number of VIP cards installed in the router.
To configure distributed switching on the VIP, you must first configure the router for IP routing.
Perform the tasks described in the following task in the order in which they appear.
SUMMARY STEPS
1. enable
2. configure terminal
3. ip routing
4. interface type slot/port-adapter/port
5. ip route-cache distributed
6. encapsulation isl vlan-identifier
Fast
Ethernet
VLAN
1,2,3
VLAN
4,5,6
VLAN
7,8,9
VLAN
10,11,12
VLAN
13,14,15
VLAN
16,17,18
Fast
Ethernet
Versatile
Interface
Processor
Distributed IP
forwarding
cache
Fast
Ethernet
Fast
Ethernet
Versatile
Interface
Processor
Distributed IP
forwarding
cache
Fast
Ethernet
Fast
Ethernet
Versatile
Interface
Processor
Distributed IP
forwarding
cache
IP routing
table
IP forwarding
table
S6622
Route Switch Processor
CyBus