3Com Switch 7757, Руководство по настройке

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148 C
HAPTER
17: IPX C
ONFIGURATION
operations: Display the MTU setting on the VLAN interface with the display
interface command and the RIP/SAP packet size with the display ipx interface
command. Check whether the RIP/SAP packet size is smaller than the MTU
setting on the VLAN interface.
Symptom 3: The switch cannot receive SAP packets.
Solutions:
■
Use the display ipx interface command to check whether SAP is disabled on the
VLAN interface.
Symptom 4: A type 20 IPX packet cannot be transmitted to other network
segments.
Solutions:
■
Use the display ipx interface command to check whether the forwarding of
type 20 IPX packets is enabled on the input and output interfaces.
■
Use the debugging ipx packet command to enable debugging for IPX packets.
Check whether there is a prompt message of “Transport Control field of IPX
type-20 packet >= 8!” A type 20 IPX packet can only be forwarded up to eight
times; for the ninth forwarding attempt, the packet is dropped.
Troubleshooting IPX RIP
Symptom 1: The switch cannot learn routes from the peer device.
Solutions:
■
Use the debugging ipx rip packet verbose command to enable debugging for
IPX RIP. Check whether there is a RIP packet with routing information from the
peer device to make sure that the underlying connection is available between
the two devices.
■
If there is a RIP packet with routing information from the peer device, you can
use the debugging ipx rip event command to check whether the received
routing information is added into the routing table.
Symptom 2: Try to import a static route to IPX RIP, but no static route is sent out.
Solutions:
■
Use the display ipx routing-table command to check whether the static route
exists.
■
If the static route is not in the routing table, use the display ipx routing-table
verbose command to check whether it exists as an inactive route. If the static
route exists, check the inactive reason. When the route becomes active, it can
be advertised as a RIP route.
■
If the configured static route is shown in the routing table, check whether its
hop count is smaller than 15.