Topology: GSR12000 GSR12000
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Two GSR routers belong to one AS100 and distribute default route to NE40. Two NE40 belong to another AS101. Internal IGP protocol of AS101is level2 ISIS; NE08 and NE05 balance uplink. It need import default route distributed by EBGP to ISIS.
Configure route filter at NE40 when imorting EBGP default route at NE40.Filter all default route from import direction.
When two NE40 at ISIS import EBGP default route from opposite device at the same time, two NE40 at ISIS will import defalut route. Normal packet cannot be forwarded .