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Unable to configure Serial WAN Interface (T1, E1, or DS3) in Layer-2 (Transparent) mode

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Article ID: KB21212 KB Last Updated: 19 Jun 2012Version: 1.0
Summary:
Unable to configure Serial WAN Interface (T1, E1, or DS3) in Layer-2 (Transparent) mode
Symptoms:
Serial WAN interface can not be put into layer two zone.
Cause:

Solution:
This is as per design of the firewall.

Serial WAN interfaces (E1, T1, or DS3) cannot be assigned a layer-2 zone.  Serial WAN interfaces only operating in Layer-3, or NAT/route mode.

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