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SR/TLB with Access Filtering Example
Configuring Source-Route Bridging BC-155
Once you have determined the ring number and the bridge number, you can add the source-bridge
transparent command to the file, including these two values as parameters for the command. The
following partial configuration includes this source-bridge transparent entry:
!
source-bridge ring-group 10
source-bridge transparent 10 3 1 1
!
interface tokenring 0
source-bridge 1 1 10
!
interface tokenring 1
source-bridge 2 1 10
!
interface ethernet 0
bridge-group 1
!
interface ethernet 1
bridge-group 1
!
bridge 1 protocol dec
SR/TLB with Access Filtering Example
In the example shown in Figure 63, you want to connect only a single machine, Host E, on an
Ethernet to a single machine, Host R, on the Token Ring.
Figure 63 Example of a Bit-Swapped Address
You want to allow only these two machines to communicate across the router. Therefore, you might
create the following configuration to restrict the access. However, this configuration will not work,
as explained in the paragraph following the sample configuration file.
Note For readability, the commands that control bridging are not shown here, just the commands
that control the filtering.
interface tokenring 0
access-expression output smac(701)
!
interface ethernet 0
bridge-group 1 input-address-list 701
!
access-list 701 permit 0110.2222.3333
S1110a
Source-route
bridged domain
Transparent
bridging domain
Router
running SR/TLB
Host E
MAC Addr:
0110.2222.3333
Token
Ring
Host R
MAC Addr:
0110.1234.5678