Infer BGP 'source address' value dynamically

[Eric Cables]

I was hoping someone could assist with defining a local constant for a BGP
'source address' through dynamic means. An example would be 'router id
from' where a mask and prefix can be identified to inherit the router ID.

router id from "lo*" 192.168.0.0/24;
saddr = <whatever router id inherited>

I was hoping that router id would be an internal symbol, but I don't see it
in the 'show symbols ...' output.

Any thoughts? The goal is to make this configuration as dynamic as
possible, so that it can be deployed to a number of systems without manual
changes on each.

-- Eric Cables
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