about MAC Address filter

From: yujianchun (stiff.yu@xxxxxxxxxxxxxxxxxx)
Date: Thu Sep 21 2000 - 03:48:05 GMT-3

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hi, all

I find a example is below:
We "remote source route bridge" to a customer network to provide
connectivity between our HOST TIC and their Gateway
PC. Here is the basic setup:

                    ======== ========
     Token Ring | | | | Token Ring
    ( #3225 )----| AGS+ |----56KB Serial----| 3000 |----( #513 )
     HOST TIC | | Link | | Gateway PC
    4000.0000.0001 ======== ======== 4000.3174.0001

We are preventing unnecessary broadcast traffic from entering our network by
using the following RSRB filter on the 3000:

    interface TokenRing 0
    source-bridge input-address-list 702

    access-list 702 permit 4000.3174.0001 8000.0000.0000

I have a question:

why canot I use command ' access-list 702 permit 4000.3174.0001
0000.0000.0000'

pls tell me answer.

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