Information Technology Reference
In-Depth Information
Table10-6
Translational Bridging: Client Cannot Connect to Server (continued)
Possible Problem
Solution
Ethernet-to-Toke
n Ring address
mapping that is
misconfigured
(continued)
Example:
The following is sample output from the show rif command:
Router# show rif
Codes: * interface, - static, + remote
Hardware Addr How
Idle (min) Routing Information
Field
5C02.0001.4322 rg5 - 0630.0053.00B0
5A00.0000.2333 TR0 3 08B0.0101.2201.0FF0
5B01.0000.4444 - - -
0000.1403.4800 TR1 0 -
0000.2805.4C00 TR0 * -
0000.2807.4C00 TR1 * -
0000.28A8.4800 TR0 0 -
0077.2201.0001 rg5 10 0830.0052.2201.0FF0
4. If Ethernet and Token Ring end systems are visible,
statically configure any relevant server MAC addresses in
the client configurations so that clients can listen to the
server advertisements directly.
One case in which static mapping is required is when bridging
DEC LAT traffic over a translational bridge. LAT services on
Ethernet are advertised on a multicast address that is mapped by
some translational bridges to a broadcast address on the Token
Ring side. Routers do not support this mapping.
Vendor code
mismatch
Older Token Ring implementations require that the vendor code
(OUT 1 field) of the SNAP 2 header be 000000. Cisco routers
modify this field to be 0000F8 to specify that the frame was
translated from Ethernet Version 2 to Token Ring. This can cause
problems on older Token Ring networks.
Specify the ethernet-transit-oui interface configuration
command to force the router to make the vendor code field
000000. This change is frequently required when there are IBM
8209s (IBM Token Ring-to-Ethernet translating bridges) in the
network.
The following is an example of the ethernet-transit-oui
command:
ethernet-transit-oui [ 90-compatible | standard | cisco ]
Syntax description:
90-compatible —OUI used 0000F8 by default, when talking
to other Cisco routers. It provides the most flexibility.
standard —OUI used 000000 when talking to IBM 8209
bridges and other vendor equipment. It does not provide for
as much flexibility as the other two choices.
continues
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