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by jauer 4568 days ago
Plain old IOS is a monolithic program and tends to be used in older routers and current small-to-medium routers & modern spins of older product lines.

IOS XR runs on QNX and tends to be used on routers in a carrier role.

IOS XE runs on Linux and tends to be used on service/aggregation routers.

1 comments

Good to know. Thanks for the info.