1 more isdn interface to ignore
1 more isdn interface to ignore

not sure if this is a typo or not, but bri singaling interfaces have 1 'l' on cisco devices.

"BRI0-Signaling" was taken from a netdisco report, router is a "897VaK9" running ios "15.5(3)M7".

as such, i've added the 1 'l' variant to the ignore_interfaces list. if this was indeed a typo perhaps the double 'll' variant can be deleted.
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