Summary

In this chapter, we have examined the basic configuration required to implement AppleTalk with the sample ZIP network. While these basic commands and features can get your AppleTalk network up and running, many other advanced features can enhance your network's operation and scalability. The texts and Web resources cited in the "Reference" section serve as excellent tutorials on understanding, implementing, and troubleshooting those features. Following are the key concepts of this chapter:

• AppleTalk Phase 1 addressing uses a single network number to identify a network segment. Phase 2 addressing uses either a single network number or a contiguous sequence of numbers of the form start-end to identify one or more networks.

• A nonextended Phase 2 address can support only a single network address, while an extended Phase 2 address can support multiple network numbers.

• Node numbers are assigned dynamically by AARP.

• LAN network numbers and zones can be configured manually or through the use of a seed router and discovery mode.

• The dynamic routing protocols offered by the Cisco IOS for use with AppleTalk are RTMP and EIGRP. RTMP is configured by default when AppleTalk routing is enabled with the appletalk routing command. EIGRP is useful in reducing bandwidth consumption on LAN links.

• Due to the flexible and dynamic nature of AppleTalk addresses, using them as a basis for filtering in access lists is not recommended. Instead, filter on the basis of service names as registered in NBP and on the basis of zone name requests and propagation.

• Access list commands are not order-dependent in AppleTalk, as they are in IP and IPX. When there are conflicting or overlapping commands, the earlier one in the list is disregarded, and the later one is implemented.

• Each access list must specify a method for handling packets and routing updates that do not satisfy any of the access control statements in the access list. Otherwise, those packets and routing updates are automatically denied or discarded.

• A variety of show, debug, and ping commands are available for verifying configurations and for troubleshooting your AppleTalk network. In addition to those summarized in Table 5-6, see Tables 5-3 and 5-5 for a review of pertinent commands.

Table 5-6. Summary of EXEC Commands for AppleTalk

Command	Definition
clear appletalk route	Clears the entire routing table or, if specified, a particular route.
clear appletalk traffic	Clears the counters in show appletalk traffic .
ping appletalk network.node	Tests to determine whether the indicated AppleTalk address is reachable and responsive .
show appletalk access-lists	Shows all AppleTalk access lists defined on the router or, if specified, the contents of a particular list.
show appletalk globals	Provides general information about AppleTalk configuration and operation.
show appletalk interface brief	Shows a brief summary of AppleTalk address information and interface status for all available interfaces on the device.
show appletalk interface interface	Shows all the parameters associated with the AppleTalk configuration of an interface.
show appletalk nbp	Shows the network number associated with a particular named resource.
show appletalk neighbors	Provides a list of AppleTalk neighbors learned via dynamic routing.
show appletalk route network-address	Shows the routing table in its entirety or, if specified, a particular route.
show appletalk static	Shows static routes that have been configured.
show appletalk traffic	Outputs overall statistics about the operation of the AppleTalk protocol on the router.
show appletalk zone	Displays a list of all AppleTalk zones known to this router.

Table 5-7. Summary of Configuration Commands for AppleTalk

Command	Definition
aaa authentication arap list method	Specifies that ARAP should be authenticated via the listed AAA method.
access-list	Creates a numbered access list and its associated filtering criteria.
access-list number [permit deny] additional-zones	Permits or denies packets and routing updates, on the basis of zones, that do not satisfy any other access control statements in the access list.
access-list number [permit deny] other-access	Permits or denies packets and routing updates, on the basis of network numbers or cable ranges, that do not satisfy any other access control statements in the access list.
access-list number [permit deny] other-nbps	Permits or denies packets and routing updates that do not satisfy any other access control statements based on NBP.
appletalk access- group number	Applies the indicated access list to the task of filtering incoming or outgoing packets on an interface.
appletalk address network.node	Assigns a Phase I network number to a LAN or WAN interface.
appletalk cable-range start-end	Assigns a Phase II cable-range to a LAN or WAN interface.
appletalk client-mode	Enables AppleTalk PPP dialup services on the asynchronous interface to which it is applied.
appletalk discovery	Implements the dynamic configuration of a network address and zone name(s) by discovery.
appletalk getzonelist-filter number	Applies the indicated access list to the task of filtering outgoing ZIP GetZoneList replies sent to workstations and servers.
appletalk maximum-paths number	Configures the router to permit the specified number of equal-cost paths in its AppleTalk routing table.
appletalk protocol [eigrp rtmp]	Specifies which routing protocol (EIGRP or RTMP) to use on a particular interface in AppleTalk networks where EIGRP is enabled.
appletalk route-redistribution	Invokes route redistribution between EIGRP and RTMP.
appletalk routing	Enables AppleTalk routing on a router.
appletalk routing eigrp autonomous-system	Enables EIGRP for AppleTalk on a router.
appletalk rtmp-stub	Configures the router to send only stub updates on the interface to which it is applied.
appletalk static	Configures a static AppleTalk route.
appletalk virtual-net	Establishes the PPP network number and zone name for dialup users.
appletalk zip-reply-filter number	Applies the indicated access list to the task of filtering outgoing ZIP zone name replies sent to other routers.
appletalk zone name	Configures a zone name on an interface.
arap authentication default	Specifies that ARAP authentication should be performed prior to allowing network services to begin. The default authentication protocol is used between the access server and the dialup client.
arap enable	Allows ARAP to operate on asynchronous lines.
arap network	Specifies the ARAP network number and zone name for dialup users.
autoselect arap	Specifies that autodetection of ARAP should be performed on an async line configured in interactive mode.
dialer map appletalk	Maps an AppleTalk network.node address to the system name and phone number for ISDN calls.
frame-relay map appletalk	Statically maps an AppleTalk network.node address to a Frame Relay DLCI.
map-group	Assigns a named map group to an interface for use in mapping AppleTalk addresses to ATM data-link addresses on an interface.
map-list	Creates a named map list to configure the mapping of AppleTalk addresses to PVCs or SVCs in ATM addressing.
x25 map appletalk	Statically maps an AppleTalk network.node address to an X.121 address.