Information Technology Reference
In-Depth Information
The following display shows input to and output from the user
ping
command:
Router> ping appletalk 2.24
Type escape sequence to abort.
Sending 5, 100-byte AppleTalk Echoes to 2.24, timeout is 2 seconds:
!!!!!
Success rate is 100 percent, round-trip min/avg/max = 4/4/8 ms
The
ping privileged exec
command also supports several AppleTalk parameters that provide additional
troubleshooting capabilities. In particular, use the NBP option when AppleTalk zones are listed in the
Chooser but services are not available. If a configuration contains the
appletalk name-lookup-interval
global configuration command, the NBP option of the AppleTalk
ping
function displays nodes by their
NBP registration names.
Preventing Internetwork Reconfiguration Problems
Configuration conflicts can occur when zone names or cable range numbers are changed. In particular,
problems arise when routing devices about which you are not administratively aware exist on the
internetwork.
Many devices can act as routers (for example, Novell servers, Pathworks servers, or UNIX workstations
running CAP to do print and file sharing). In general, if you are changing zone names or cable range
numbers in your internetwork, shut down all routers so that a Cisco router does not see a conflict and
prevent AppleTalk from initializing on the interface.
Before changing the configuration, use the
show appletalk neighbors exec
command to determine on
which routers you should disable AppleTalk routing.You should disable AppleTalk on all routers that are
on the same network segment and that have sent RTMP updates in the past 10 seconds. Disable
AppleTalk routing on all of the appropriate interfaces, wait approximately 10 minutes, and then bring up
the seed router.
Changing Zone Names
When changing a zone name on an existing network, perform the following actions:
Step 1
Disable AppleTalk on all router interfaces on the cable for approximately 10 minutes. This allows all
routers in the internetwork to age out the network number from their routing tables.
Step 2
Configure the new zone list.
Step 3
Re-enable AppleTalk on all interfaces.
These actions are required because AppleTalk makes no provisions for informing neighbors in the
internetwork about a changed zone list. Routers make ZIP queries only when a new (or previously
aged-out) network appears on the internetwork.
Adding a new zone to an extended cable configuration prevents the router from bringing up an AppleTalk
interface after the interface has been reset. This is because its configuration no longer matches that of its
neighbors (that is, it detects a configuration mismatch error).
AppleTalk Discovery Mode
When bringing up an interface on an existing cable where a long zone list is defined, using AppleTalk
discovery mode helps you save effort and avoid mistakes.
The following steps outline bringing up an interface in discovery mode:
