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Configuring ATM Half-Bridge Services
1-8
300017-A Rev. 00
Unsecure Learning Method
AHB learns new bridge entries from any IP and ARP packets it receives on
ATM/AHB-configured interfaces when you set the auto learn method to unsecure
or both.
Secure Learning Method
When you set the auto learning method to Secure or Both, AHB learns new bridge
entries from DHCP replies sent on AHB-configured circuits. Secure entries take
precedence over unsecure entries.
Before you can use secure learning mode, make sure that you:
Configure BootP on both the unnumbered ATM interface and on the
associated numbered IP interface.
Configure a BootP preferred server or forwarding interface on the
unnumbered ATM interface (use the circuit number as the IP source address).
Verify that the IP address assigned by the DHCP server is on a different
subnet than the BootP gateway address (that is, the associated numbered IP
interface).
In secure learning mode, the AHB router serves as a BootP relay agent,
forwarding DHCP requests it receives from CPE hosts.
When you set the learning method to both, AHB learns bridge entries either
securely and unsecurely. When you set the learning method to None, AHB will
not learn new bridge entries.
For information about configuring the auto learn method on an AHB router, see
Chapter 3, “Setting the Auto Learn Method.”
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