Cabletron Systems 2.2 Manual De Usuario

Bridging

2-96

Setting Bridge Translation

The SNAP format table contains Ethernet type Þeld entries that the bridge uses to 
determine how to translate a Token Ring (802.5 with SNAP) packet to an Ethernet 
packet. If a Token Ring packet is received that matches the Ethernet type Þeld of 
an enabled entry, the bridge will translate the Token Ring packet to the frame 
format speciÞed by the button above the table. Otherwise, it will translate the 
packet to the opposite frame format.

Figure 2-37. SNAP Format Table

The SNAP Format Table contains the following Þelds:

Displays the index of an entry in the Token Ring-to-Ethernet Translation table for 
Ethernet type Þelds. The index can range between 1 and 20.

Displays the Ethernet type Þeld value which the bridge will use to translate all 
Token Ring 802.5 packets with a SNAP header and this type Þeld to the format 
speciÞed by the button. The Ethernet type Þeld value must be two octets.

Displays if this entry will be used in the packet translation process. If the state is 
Enabled

 the entry is used; if the state is Disabled the entry is not used.

When you choose the SNAP format, you select the Ethernet frame format to 
which the bridge translates all Token Ring packets with a SNAP header whose 
Ethernet type resides in the table and whose entry is enabled.

To conÞgure the SNAP Translation Table:

1.

Click on the SNAP Format button on the Bridge Translation window. It will 
toggle between the Enet and SNAP formats. The format that appears in the 
button is the one that is currently being used.

2.

Click on the scroll box next to the entry and the scrollable window of entries 
will appear.