Medianet Reference Guide - Cisco

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Auto Smartports Chapter 7 Medianet Auto Configuration Finally, as with the previous method, there is no mechanism to validate the overridden ASP macro has no errors or is the correct macro for the model of switch to which it will be automatically downloaded. It is again recommended that the network administrator test any overridden macros— perhaps using a non-production lab or backup switch—before making them available for automatic download in order to avoid such errors. Note CiscoWorks LMS is targeted to add support for managing Auto Smartports macros in an upcoming release. Future updates to this document may include details about LMS as it relates to ASP macros. Macro-of-Last-Resort As highlighted in Table 7-2, Enhanced ASP macros support a feature known as the macro-of-last-resort (also referred to as the LAST_RESORT macro). The macro-of-last-resort is a built-in ASP macro which is run if no other trigger event is seen and therefore no other ASP macro (built-in or user-defined) is run. Without the use of the macro-of-last-resort, devices such as end-user PCs—which typically will not trigger any ASP macros—may end up with a default switchport configuration, depending on whether the custom macro has been overridden. This may not be the desired switchport configuration, particularly if the network administrator uses a VLAN other than VLAN1 for the normal data VLAN. The custom macro is discussed in Custom Macro. Note The use of a VLAN other than the default (VLAN 1) for the data VLAN is consistent with Cisco SAFE security guidelines. The built-in macro-of-last-resort is enabled on Catalyst switches which support Enhanced ASP macros via the following global configuration command: macro auto global control trigger last-resort The macro-of-last-resort can also be enabled per interface with the following interface-level command: macro auto control trigger last-resort The only parameter which can be passed into the built-in ASP macro-of-last-resort is the access VLAN. This can be passed using the following global switch configuration command: macro auto execute CISCO_LAST_RESORT_EVENT built-in CISCO_LAST_RESORT_SMARTPORT ACCESS_VLAN= For example, in order to set the access VLAN to VLAN100 for the macro-of-last-resort, the network administrator would configure the following global switch command: macro auto execute CISCO_LAST_RESORT_EVENT built-in CISCO_LAST_RESORT_SMARTPORT ACCESS_VLAN=100 The example in Table 7-14 shows the switchport macro-of-last-resort configuration applied after a link-up event for a Catalyst access switch. The configuration assumes the initial switchport configuration was a default configuration (meaning no configuration on the interface). 7-18 Medianet Reference Guide OL-22201-01
Chapter 7 Medianet Auto Configuration Auto Smartports Table 7-14 Configuration Example 6—Switchport Configuration Resulting from the Built-in Macro-of-Last-Resort ! interface GigabitEthernet1/0/7 switchport access vlan 100 1 switchport mode access load-interval 60 macro description CISCO_LAST_RESORT_EVENT spanning-tree portfast spanning-tree bpdufilter enable ! 1. Access VLAN set by macro auto execute CISCO_LAST_RESORT_EVENT built-in CISCO_LAST_RESORT_SMARTPORT ACCESS_VLAN=100 global configuration command. Brief explanations of the commands are shown in Table 7-15. Table 7-15 Summary of ASP Commands Command switchport access vlan 100 switchport mode access load-interval 60 macro description CISCO_LAST_RESORT_EVENT spanning-tree portfast spanning-tree bpduguard enable Description Configures the switchport as a static access port using the access VLAN specified through the following manually configured global command: macro auto execute CISCO_LAST_RESORT_EVENT built-in CISCO_LAST_RESORT_SMARTPORT ACCESS_VLAN=100 The port is set to access unconditionally and operates as a nontrunking, single VLAN interface that sends and receives nonencapsulated (non-tagged) frames. Sets the interval over which interface statistics are collected to average over 60 seconds. Description indicating which built-in macro has been applied to the interface, in this case the built in last-resort macro. When the Port Fast feature is enabled, the interface changes directly from a blocking state to a forwarding state without making the intermediate spanning-tree state changes. Puts the interface in the error-disabled state when it receives a bridge protocol data unit (BPDU). This should not occur on a port configured for access mode. When the device is removed from the interface, the anti-macro will return the switchport to a default interface configuration. The macro-of-last-resort can also be overridden. This allows the network administrator to implement a completely custom default switchport configuration for devices which do not match any built-in or user-defined ASP macros. Since the macro-of-last resort executes if no other triggering events are seen, including MAC-address trigger events, there could be a delay of over one minute between the time the switchport interface becomes active and the execution of the macro-of-last-resort. During this time period, the device will be active on the default VLAN (VLAN 1)—unless it was left on a different VLAN by the custom macro. OL-22201-01 Medianet Reference Guide 7-19
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