Cisco WS-C6506 Software Manual page 314

Configuring InterVLAN Routing on the MSFC
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Configure the Cisco IOS WCCP as described in the Cisco IOS Configuration Fundamentals
Configuration Guide at this URL:
http://www.cisco.com/en/US/docs/ios/12_1/configfun/configuration/guide/fcd305.html
Autostate Feature
These MSFC autostate port-based modes are supported:
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Normal Autostate Mode
Autostate shuts down (or brings up) the Layer 3 interfaces/subinterfaces on the MSFC and the Multilayer
Switch Module (MSM) when the following port configuration changes occur on the switch:
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The Catalyst 6500 series switch does not have knowledge of, or control over, the MSM or MSFC
configuration (just as the switch does not have knowledge of, or control over, external router
configurations). Autostate does not work on MSM or MSFC interfaces if the MSM or MSFC is not
properly configured. For example, consider this MSM trunk configuration:
interface GigabitEthernet0/0/0.200
In the example, the GigabitEthernet0/0/0.200 interface is not autostated if any of these configuration
errors are made:
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Autostate Exclude Mode
Autostate exclude mode allows you to specify the ports to exclude from autostate. In normal autostate
mode, the Layer 3 interfaces remain up if at least one port in the VLAN remains up. If you have
appliances, such as load balancers or firewall servers that are connected to the ports in the VLAN, you
can configure these ports to be excluded from the autostate feature to make sure that the forwarding SVI
does not go down if these ports become inactive.
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
12-6
Layer 2 redirection takes place on the switch and is not visible to the MSFC. Entering the show ip
wccp web-cache detail command on the MSFC displays statistics for only the first packet of a
Layer 2 redirected flow, which provides an indication of how many flows, rather than packets, are
using Layer 2 redirection. Entering the show mls entries command on the supervisor engine
displays the other packets in the Layer 2 redirected flows.
Normal Autostate Mode, page 12-6
Autostate Exclude Mode, page 12-6
Autostate Track Mode, page 12-7
When the last port on a VLAN goes down, all the Layer 3 interfaces/subinterfaces on that VLAN
shut down (are autostated) unless sc0 is on the VLAN or another router is in the chassis with an
interface/subinterface in the VLAN.
When the first port on the VLAN is brought back up, all the Layer 3 interfaces on that VLAN that
were previously shut down are brought up.
encap isl 200
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VLAN 200 is not configured on the switch.
Trunking is not configured on the corresponding Gigabit Ethernet switch port.
Trunking is configured but VLAN 200 is not an allowed VLAN on that trunk.
Chapter 12 Configuring InterVLAN Routing
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